Where was the atomic bomb invented? Who invented the atomic bomb? History of the invention and creation of the Soviet atomic bomb

At the end of the 30s of the last century, the laws of fission and decay were already discovered in Europe, and the hydrogen bomb moved from the category of fiction into reality. The history of the development of nuclear energy is interesting and still represents an exciting competition between the scientific potential of the countries: Nazi Germany, the USSR and the USA. The most powerful bomb, which any state dreamed of owning, was not only a weapon, but also a powerful political tool. The country that had it in its arsenal actually became omnipotent and could dictate its own rules.

The hydrogen bomb has its own history of creation, which is based on physical laws, namely the thermonuclear process. Initially, it was incorrectly called atomic, and illiteracy was to blame. The scientist Bethe, who later became a Nobel Prize winner, worked on an artificial source of energy - the fission of uranium. This time was the peak of the scientific activity of many physicists, and among them there was an opinion that scientific secrets should not exist at all, since the laws of science were initially international.

Theoretically, the hydrogen bomb had been invented, but now, with the help of designers, it had to acquire technical forms. All that remained was to pack it in a specific shell and test it for power. There are two scientists whose names will forever be associated with the creation of this powerful weapon: in the USA it is Edward Teller, and in the USSR it is Andrei Sakharov.

In the United States, a physicist began to study the thermonuclear problem back in 1942. By order of Harry Truman, then President of the United States, the best scientists in the country worked on this problem, they created a fundamentally new weapon of destruction. Moreover, the government’s order was for a bomb with a capacity of at least a million tons of TNT. The hydrogen bomb was created by Teller and showed humanity in Hiroshima and Nagasaki its limitless but destructive capabilities.

A bomb was dropped on Hiroshima that weighed 4.5 tons and contained 100 kg of uranium. This explosion corresponded to almost 12,500 tons of TNT. The Japanese city of Nagasaki was destroyed by a plutonium bomb of the same mass, but equivalent to 20,000 tons of TNT.

The future Soviet academician A. Sakharov in 1948, based on his research, presented the design of a hydrogen bomb under the name RDS-6. His research followed two branches: the first was called “puff” (RDS-6s), and its feature was an atomic charge, which was surrounded by layers of heavy and light elements. The second branch is the “pipe” or (RDS-6t), in which the plutonium bomb was contained in liquid deuterium. Subsequently, a very important discovery was made, which proved that the “pipe” direction is a dead end.

The principle of operation of a hydrogen bomb is as follows: first, an HB charge explodes inside the shell, which is the initiator of a thermonuclear reaction, resulting in a neutron flash. In this case, the process is accompanied by the release of high temperature, which is needed for further neutrons begin to bombard the lithium deuteride insert, and it, in turn, under the direct action of neutrons, splits into two elements: tritium and helium. The atomic fuse used forms the components necessary for fusion to occur in the already detonated bomb. This is the complicated operating principle of a hydrogen bomb. After this preliminary action, the thermonuclear reaction begins directly in a mixture of deuterium and tritium. At this time, the temperature in the bomb increases more and more, and an increasing amount of hydrogen participates in the synthesis. If you monitor the time of these reactions, then the speed of their action can be characterized as instantaneous.

Subsequently, scientists began to use not the synthesis of nuclei, but their fission. The fission of one ton of uranium creates energy equivalent to 18 Mt. This bomb has enormous power. The most powerful bomb created by mankind belonged to the USSR. She even got into the Guinness Book of Records. Its blast wave was equivalent to 57 (approximately) megatons of TNT. It was blown up in 1961 in the area of ​​the Novaya Zemlya archipelago.

Sergey LESKOV

On August 12, 1953, the world's first hydrogen bomb was tested at the Semipalatinsk test site. This was the fourth Soviet nuclear weapons test. The power of the bomb, which had the secret code “product RDS-6 s,” reached 400 kilotons, 20 times more than the first atomic bombs in the USA and USSR. After the test, Kurchatov turned to 32-year-old Sakharov with a deep bow: “Thank you, the savior of Russia!”

Which is better - Bee Line or MTS? One of the most pressing issues of Russian everyday life. Half a century ago, in a narrow circle of nuclear physicists, the question was equally acute: which is better - an atomic bomb or a hydrogen one, also known as thermonuclear one? The atomic bomb, which the Americans made in 1945, and we made in 1949, is built on the principle of releasing colossal energy by separating heavy uranium or artificial plutonium nuclei. A thermonuclear bomb is built on a different principle: energy is released by the fusion of light isotopes of hydrogen, deuterium and tritium. Materials based on light elements do not have a critical mass, which was a great design difficulty in the atomic bomb. In addition, the fusion of deuterium and tritium releases 4.2 times more energy than the fission of nuclei of the same mass of uranium-235. In short, a hydrogen bomb is a much more powerful weapon than an atomic bomb.

In those years, the destructive power of the hydrogen bomb did not scare away any scientists. The world entered the era of the Cold War, McCarthyism was raging in the USA, and another wave of revelations arose in the USSR. Only Pyotr Kapitsa allowed himself demarches, who did not even appear at the ceremonial meeting at the Academy of Sciences on the occasion of Stalin’s 70th birthday. The question of his expulsion from the ranks of the academy was discussed, but the situation was saved by the President of the Academy of Sciences Sergei Vavilov, who noted that the first to be expelled was the classic writer Sholokhov, who skimps on all meetings without exception.

As is known, scientists were helped by intelligence data in creating the atomic bomb. But our agents almost ruined the hydrogen bomb. The information obtained from the famous Klaus Fuchs led both Americans and Soviet physicists to a dead end. The group under the command of Zeldovich lost 6 years checking erroneous data. Intelligence also provided the opinion of the famous Niels Bohr about the unreality of the “superbomb”. But the USSR had its own ideas, the prospects of which were difficult and risky for Stalin and Beria, who were pushing for the atomic bomb with all their might. This circumstance must not be forgotten in fruitless and stupid disputes about who worked more on nuclear weapons - Soviet intelligence or Soviet science.

The work on the hydrogen bomb was the first intellectual race in human history. To create an atomic bomb, it was important, first of all, to solve engineering problems and carry out large-scale work in mines and factories. The hydrogen bomb led to the emergence of new scientific directions - physics of high-temperature plasma, physics of ultra-high energy densities, physics of anomalous pressures. For the first time I had to resort to mathematical modeling. Our scientists compensated for the lag behind the United States in the field of computers (von Neumann apparatuses were already in use overseas) with ingenious computational methods using primitive adding machines.

In short, it was the world's first battle of wits. And the USSR won this battle. An alternative design for a hydrogen bomb was invented by Andrei Sakharov, an ordinary employee of Zeldovich’s group. Back in 1949, he proposed the original idea of ​​the so-called “puff paste”, where cheap uranium-238, which was considered waste in the production of weapons-grade uranium, was used as an effective nuclear material. But if this “waste” is bombarded by fusion neutrons, 10 times more energy-intensive than fission neutrons, then uranium-238 begins to fission and the cost of obtaining each kiloton is reduced many times over. The phenomenon of ionization compression of thermonuclear fuel, which became the basis of the first Soviet hydrogen bomb, is still called “saccharization.” Vitaly Ginzburg proposed lithium deuteride as a fuel.

Work on the atomic and hydrogen bombs proceeded in parallel. Even before the atomic bomb tests in 1949, Vavilov and Khariton informed Beria about the “sloika”. After the infamous directive of President Truman in early 1950, at a meeting of the Special Committee chaired by Beria, it was decided to speed up work on the Sakharov design with a TNT equivalent of 1 megaton and a test date in 1954.

On November 1, 1952, at Elugelub Atoll, the United States tested the Mike thermonuclear device with an energy release of 10 megatons, 500 times more powerful than the bomb dropped on Hiroshima. However, "Mike" was not a bomb - a gigantic structure the size of a two-story house. But the power of the explosion was amazing. The neutron flux was so great that it was possible to discover two new elements - einsteinium and fermium.

They threw all their efforts into the hydrogen bomb. The work was not slowed down by either the death of Stalin or the arrest of Beria. Finally, on August 12, 1953, the world's first hydrogen bomb was tested in Semipalatinsk. The environmental consequences were horrific. The first explosion during the nuclear tests in Semipalatinsk accounted for 82% of strontium-90 and 75% of cesium-137. But then no one thought about radioactive contamination, or about the environment in general.

The first hydrogen bomb caused the rapid development of Soviet cosmonautics. After the nuclear tests, the Korolev Design Bureau received the task of developing an intercontinental ballistic missile for this charge. This rocket, called the “seven”, launched the first artificial satellite of the Earth into space, and the first cosmonaut of the planet, Yuri Gagarin, launched on it.

On November 6, 1955, a hydrogen bomb dropped from a Tu-16 aircraft was tested for the first time. In the United States, the dropping of a hydrogen bomb took place only on May 21, 1956. But it turned out that Andrei Sakharov’s first bomb was also a dead end; it was never tested again. Even earlier, on March 1, 1954, near the Bikini Atoll, the United States detonated a charge of unheard-of power - 15 megatons. It was based on the idea of ​​Teller and Ulam about the compression of the thermonuclear unit not by mechanical energy and neutron flux, but by the radiation of the first explosion, the so-called initiator. After the test, which resulted in casualties among the civilian population, Igor Tamm demanded that his colleagues abandon all previous ideas, even the national pride of the “puff puff”, and find a fundamentally new path: “Everything we have done so far is of no use to anyone. We are unemployed. I am confident that in a few months we will reach our goal."

And already in the spring of 1954, Soviet physicists came up with the idea of ​​an explosive initiator. The authorship of the idea belongs to Zeldovich and Sakharov. On November 22, 1955, a Tu-16 dropped a bomb with a design power of 3.6 megatons over the Semipalatinsk test site. During these tests there were deaths, the radius of destruction reached 350 km, and Semipalatinsk suffered.

There was a nuclear arms race ahead. But in 1955 it became clear that the USSR had achieved nuclear parity with the United States.

The world of the atom is so fantastic that understanding it requires a radical break in the usual concepts of space and time. Atoms are so small that if a drop of water could be enlarged to the size of the Earth, each atom in that drop would be smaller than an orange. In fact, one drop of water consists of 6000 billion billion (6000000000000000000000) hydrogen and oxygen atoms. And yet, despite its microscopic size, the atom has a structure to some extent similar to the structure of our solar system. In its incomprehensibly small center, the radius of which is less than one trillionth of a centimeter, there is a relatively huge “sun” - the nucleus of an atom.

Tiny “planets” - electrons - revolve around this atomic “sun”. The nucleus consists of the two main building blocks of the Universe - protons and neutrons (they have a unifying name - nucleons). An electron and a proton are charged particles, and the amount of charge in each of them is exactly the same, but the charges differ in sign: the proton is always positively charged, and the electron is negatively charged. The neutron does not carry an electrical charge and, as a result, has a very high permeability.

In the atomic scale of measurements, the mass of a proton and a neutron is taken as unity. The atomic weight of any chemical element therefore depends on the number of protons and neutrons contained in its nucleus. For example, a hydrogen atom, with a nucleus consisting of only one proton, has an atomic mass of 1. A helium atom, with a nucleus of two protons and two neutrons, has an atomic mass of 4.

The nuclei of atoms of the same element always contain the same number of protons, but the number of neutrons may vary. Atoms that have nuclei with the same number of protons, but differ in the number of neutrons and are varieties of the same element are called isotopes. To distinguish them from each other, a number is assigned to the symbol of the element equal to the sum of all particles in the nucleus of a given isotope.

The question may arise: why does the nucleus of an atom not fall apart? After all, the protons included in it are electrically charged particles with the same charge, which must repel each other with great force. This is explained by the fact that inside the nucleus there are also so-called intranuclear forces that attract nuclear particles to each other. These forces compensate for the repulsive forces of protons and prevent the nucleus from spontaneously flying apart.

Intranuclear forces are very strong, but act only at very close distances. Therefore, the nuclei of heavy elements, consisting of hundreds of nucleons, turn out to be unstable. The particles of the nucleus are in continuous motion here (within the volume of the nucleus), and if you add some additional amount of energy to them, they can overcome the internal forces - the nucleus will split into parts. The amount of this excess energy is called excitation energy. Among the isotopes of heavy elements, there are those that seem to be on the very verge of self-disintegration. Just a small “push” is enough, for example, a simple neutron hitting the nucleus (and it does not even have to accelerate to high speed) for the nuclear fission reaction to occur. Some of these “fissile” isotopes were later learned to be produced artificially. In nature, there is only one such isotope - uranium-235.

Uranus was discovered in 1783 by Klaproth, who isolated it from uranium tar and named it after the recently discovered planet Uranus. As it turned out later, it was, in fact, not uranium itself, but its oxide. Pure uranium, a silvery-white metal, was obtained
only in 1842 Peligo. The new element did not have any remarkable properties and did not attract attention until 1896, when Becquerel discovered the phenomenon of radioactivity in uranium salts. After this, uranium became the object of scientific research and experimentation, but still had no practical use.

When, in the first third of the 20th century, physicists more or less understood the structure of the atomic nucleus, they first of all tried to fulfill the long-standing dream of alchemists - they tried to transform one chemical element into another. In 1934, French researchers, the spouses Frederic and Irene Joliot-Curie, reported to the French Academy of Sciences about the following experience: when bombarding aluminum plates with alpha particles (nuclei of a helium atom), aluminum atoms turned into phosphorus atoms, but not ordinary ones, but radioactive ones, which in turn became into a stable isotope of silicon. Thus, an aluminum atom, having added one proton and two neutrons, turned into a heavier silicon atom.

This experience suggested that if you “bombard” the nuclei of the heaviest element existing in nature - uranium - with neutrons, you can obtain an element that does not exist in natural conditions. In 1938, German chemists Otto Hahn and Fritz Strassmann repeated in general terms the experience of the Joliot-Curie spouses, using uranium instead of aluminum. The results of the experiment were not at all what they expected - instead of a new superheavy element with a mass number greater than that of uranium, Hahn and Strassmann received light elements from the middle part of the periodic table: barium, krypton, bromine and some others. The experimenters themselves were unable to explain the observed phenomenon. Only the following year, physicist Lise Meitner, to whom Hahn reported his difficulties, found the correct explanation for the observed phenomenon, suggesting that when uranium is bombarded with neutrons, its nucleus splits (fissions). In this case, nuclei of lighter elements should have been formed (that’s where barium, krypton and other substances came from), as well as 2-3 free neutrons should have been released. Further research made it possible to clarify in detail the picture of what was happening.

Natural uranium consists of a mixture of three isotopes with masses 238, 234 and 235. The main amount of uranium is isotope-238, the nucleus of which includes 92 protons and 146 neutrons. Uranium-235 is only 1/140 of natural uranium (0.7% (it has 92 protons and 143 neutrons in its nucleus), and uranium-234 (92 protons, 142 neutrons) is only 1/17500 of the total mass of uranium (0 , 006%.The least stable of these isotopes is uranium-235.

From time to time, the nuclei of its atoms spontaneously divide into parts, as a result of which lighter elements of the periodic table are formed. The process is accompanied by the release of two or three free neutrons, which rush at enormous speed - about 10 thousand km/s (they are called fast neutrons). These neutrons can hit other uranium nuclei, causing nuclear reactions. Each isotope behaves differently in this case. Uranium-238 nuclei in most cases simply capture these neutrons without any further transformations. But in approximately one case out of five, when a fast neutron collides with the nucleus of the isotope-238, a curious nuclear reaction occurs: one of the neutrons of uranium-238 emits an electron, turning into a proton, that is, the uranium isotope turns into a more
heavy element - neptunium-239 (93 protons + 146 neutrons). But neptunium is unstable - after a few minutes, one of its neutrons emits an electron, turning into a proton, after which the neptunium isotope turns into the next element in the periodic table - plutonium-239 (94 protons + 145 neutrons). If a neutron hits the nucleus of unstable uranium-235, then fission immediately occurs - the atoms disintegrate with the emission of two or three neutrons. It is clear that in natural uranium, most of the atoms of which belong to the isotope-238, this reaction has no visible consequences - all free neutrons will eventually be absorbed by this isotope.

Well, what if we imagine a fairly massive piece of uranium consisting entirely of isotope-235?

Here the process will go differently: neutrons released during the fission of several nuclei, in turn, hitting neighboring nuclei, cause their fission. As a result, a new portion of neutrons is released, which splits the next nuclei. Under favorable conditions, this reaction proceeds like an avalanche and is called a chain reaction. To start it, a few bombarding particles may be enough.

Indeed, let uranium-235 be bombarded by only 100 neutrons. They will separate 100 uranium nuclei. In this case, 250 new neutrons of the second generation will be released (on average 2.5 per fission). Second generation neutrons will produce 250 fissions, which will release 625 neutrons. In the next generation it will become 1562, then 3906, then 9670, etc. The number of divisions will increase indefinitely if the process is not stopped.

However, in reality only a small fraction of neutrons reach the nuclei of atoms. The rest, quickly rushing between them, are carried away into the surrounding space. A self-sustaining chain reaction can only occur in a sufficiently large array of uranium-235, which is said to have a critical mass. (This mass under normal conditions is 50 kg.) It is important to note that the fission of each nucleus is accompanied by the release of a huge amount of energy, which turns out to be approximately 300 million times more than the energy spent on fission! (It is estimated that the complete fission of 1 kg of uranium-235 releases the same amount of heat as the combustion of 3 thousand tons of coal.)

This colossal burst of energy, released in a matter of moments, manifests itself as an explosion of monstrous force and underlies the action of nuclear weapons. But in order for this weapon to become a reality, it is necessary that the charge consist not of natural uranium, but of a rare isotope - 235 (such uranium is called enriched). It was later discovered that pure plutonium is also a fissile material and could be used in an atomic charge instead of uranium-235.

All these important discoveries were made on the eve of World War II. Soon, secret work on creating an atomic bomb began in Germany and other countries. In the USA, this problem was addressed in 1941. The entire complex of works was given the name “Manhattan Project”.

Administrative management of the project was carried out by General Groves, and scientific management was carried out by University of California professor Robert Oppenheimer. Both were well aware of the enormous complexity of the task facing them. Therefore, Oppenheimer's first concern was recruiting a highly intelligent scientific team. In the USA at that time there were many physicists who emigrated from Nazi Germany. It was not easy to attract them to create weapons directed against their former homeland. Oppenheimer spoke personally to everyone, using all the power of his charm. Soon he managed to gather a small group of theorists, whom he jokingly called “luminaries.” And in fact, it included the greatest specialists of that time in the field of physics and chemistry. (Among them are 13 Nobel Prize laureates, including Bohr, Fermi, Frank, Chadwick, Lawrence.) Besides them, there were many other specialists of various profiles.

The US government did not skimp on expenses, and the work took on a grand scale from the very beginning. In 1942, the world's largest research laboratory was founded at Los Alamos. The population of this scientific city soon reached 9 thousand people. In terms of the composition of scientists, the scope of scientific experiments, and the number of specialists and workers involved in the work, the Los Alamos Laboratory had no equal in world history. The Manhattan Project had its own police, counterintelligence, communications system, warehouses, villages, factories, laboratories, and its own colossal budget.

The main goal of the project was to obtain enough fissile material from which several atomic bombs could be created. In addition to uranium-235, the charge for the bomb, as already mentioned, could be the artificial element plutonium-239, that is, the bomb could be either uranium or plutonium.

Groves and Oppenheimer agreed that work should be carried out simultaneously in two directions, since it was impossible to decide in advance which of them would be more promising. Both methods were fundamentally different from each other: the accumulation of uranium-235 had to be carried out by separating it from the bulk of natural uranium, and plutonium could only be obtained as a result of a controlled nuclear reaction when uranium-238 was irradiated with neutrons. Both paths seemed unusually difficult and did not promise easy solutions.

In fact, how can one separate two isotopes that differ only slightly in weight and chemically behave in exactly the same way? Neither science nor technology has ever faced such a problem. The production of plutonium also seemed very problematic at first. Before this, the entire experience of nuclear transformations was reduced to a few laboratory experiments. Now they had to master the production of kilograms of plutonium on an industrial scale, develop and create a special installation for this - a nuclear reactor, and learn to control the course of the nuclear reaction.

Both there and here a whole complex of complex problems had to be solved. Therefore, the Manhattan Project consisted of several subprojects, headed by prominent scientists. Oppenheimer himself was the head of the Los Alamos Scientific Laboratory. Lawrence was in charge of the Radiation Laboratory at the University of California. Fermi conducted research at the University of Chicago to create a nuclear reactor.

At first, the most important problem was obtaining uranium. Before the war, this metal had virtually no use. Now that it was needed immediately in huge quantities, it turned out that there was no industrial method of producing it.

The Westinghouse company took up its development and quickly achieved success. After purifying the uranium resin (uranium occurs in nature in this form) and obtaining uranium oxide, it was converted into tetrafluoride (UF4), from which uranium metal was separated by electrolysis. If at the end of 1941 American scientists had only a few grams of uranium metal at their disposal, then already in November 1942 its industrial production at Westinghouse factories reached 6,000 pounds per month.

At the same time, work was underway to create a nuclear reactor. The process of producing plutonium actually boiled down to irradiating uranium rods with neutrons, as a result of which part of the uranium-238 would turn into plutonium. The sources of neutrons in this case could be fissile atoms of uranium-235, scattered in sufficient quantities among atoms of uranium-238. But in order to maintain the constant production of neutrons, a chain reaction of fission of uranium-235 atoms had to begin. Meanwhile, as already mentioned, for every atom of uranium-235 there were 140 atoms of uranium-238. It is clear that neutrons scattering in all directions had a much higher probability of meeting them on their way. That is, a huge number of released neutrons turned out to be absorbed by the main isotope without any benefit. Obviously, under such conditions a chain reaction could not take place. How to be?

At first it seemed that without the separation of two isotopes, the operation of the reactor was generally impossible, but one important circumstance was soon established: it turned out that uranium-235 and uranium-238 were susceptible to neutrons of different energies. The nucleus of a uranium-235 atom can be split by a neutron of relatively low energy, having a speed of about 22 m/s. Such slow neutrons are not captured by uranium-238 nuclei - for this they must have a speed of the order of hundreds of thousands of meters per second. In other words, uranium-238 is powerless to prevent the beginning and progress of a chain reaction in uranium-235 caused by neutrons slowed down to extremely low speeds - no more than 22 m/s. This phenomenon was discovered by the Italian physicist Fermi, who lived in the USA since 1938 and led the work here to create the first reactor. Fermi decided to use graphite as a neutron moderator. According to his calculations, the neutrons emitted from uranium-235, having passed through a 40 cm layer of graphite, should have reduced their speed to 22 m/s and begun a self-sustaining chain reaction in uranium-235.

Another moderator could be so-called “heavy” water. Since the hydrogen atoms included in it are very similar in size and mass to neutrons, they could best slow them down. (With fast neutrons, approximately the same thing happens as with balls: if a small ball hits a large one, it rolls back, almost without losing speed, but when it meets a small ball, it transfers a significant part of its energy to it - just like a neutron in an elastic collision bounces off a heavy nucleus, slowing down only slightly, and when colliding with the nuclei of hydrogen atoms, it very quickly loses all its energy.) However, ordinary water is not suitable for slowing down, since its hydrogen tends to absorb neutrons. That is why deuterium, which is part of “heavy” water, should be used for this purpose.

In early 1942, under Fermi's leadership, construction began on the first nuclear reactor in history in the tennis court area under the west stands of Chicago Stadium. The scientists carried out all the work themselves. The reaction can be controlled in the only way - by adjusting the number of neutrons participating in the chain reaction. Fermi intended to achieve this using rods made of substances such as boron and cadmium, which strongly absorb neutrons. The moderator was graphite bricks, from which the physicists built columns 3 m high and 1.2 m wide. Rectangular blocks with uranium oxide were installed between them. The entire structure required about 46 tons of uranium oxide and 385 tons of graphite. To slow down the reaction, rods of cadmium and boron were introduced into the reactor.

If this were not enough, then for insurance, two scientists stood on a platform located above the reactor with buckets filled with a solution of cadmium salts - they were supposed to pour them onto the reactor if the reaction got out of control. Fortunately, this was not necessary. On December 2, 1942, Fermi ordered all control rods to be extended and the experiment began. After four minutes, the neutron counters began to click louder and louder. With every minute the intensity of the neutron flux became greater. This indicated that a chain reaction was taking place in the reactor. It lasted for 28 minutes. Then Fermi gave the signal, and the lowered rods stopped the process. Thus, for the first time, man freed the energy of the atomic nucleus and proved that he could control it at will. Now there was no longer any doubt that nuclear weapons were a reality.

In 1943, the Fermi reactor was dismantled and transported to the Aragonese National Laboratory (50 km from Chicago). Was here soon
Another nuclear reactor was built in which heavy water was used as a moderator. It consisted of a cylindrical aluminum tank containing 6.5 tons of heavy water, into which were vertically immersed 120 rods of uranium metal, encased in an aluminum shell. The seven control rods were made of cadmium. Around the tank there was a graphite reflector, then a screen made of lead and cadmium alloys. The entire structure was enclosed in a concrete shell with a wall thickness of about 2.5 m.

Experiments at these pilot reactors confirmed the possibility of industrial production of plutonium.

The main center of the Manhattan Project soon became the town of Oak Ridge in the Tennessee River Valley, whose population grew to 79 thousand people in a few months. Here, the first enriched uranium production plant in history was built in a short time. An industrial reactor producing plutonium was launched here in 1943. In February 1944, about 300 kg of uranium was extracted from it daily, from the surface of which plutonium was obtained by chemical separation. (To do this, the plutonium was first dissolved and then precipitated.) The purified uranium was then returned to the reactor. That same year, construction began on the huge Hanford plant in the barren, bleak desert on the south bank of the Columbia River. Three powerful nuclear reactors were located here, producing several hundred grams of plutonium every day.

In parallel, research was in full swing to develop an industrial process for uranium enrichment.

After considering various options, Groves and Oppenheimer decided to focus their efforts on two methods: gaseous diffusion and electromagnetic.

The gas diffusion method was based on a principle known as Graham's law (it was first formulated in 1829 by the Scottish chemist Thomas Graham and developed in 1896 by the English physicist Reilly). According to this law, if two gases, one of which is lighter than the other, are passed through a filter with negligibly small holes, then slightly more of the light gas will pass through it than of the heavy one. In November 1942, Urey and Dunning from Columbia University created a gaseous diffusion method for separating uranium isotopes based on the Reilly method.

Since natural uranium is a solid, it was first converted into uranium fluoride (UF6). This gas was then passed through microscopic - on the order of thousandths of a millimeter - holes in the filter partition.

Since the difference in the molar weights of the gases was very small, behind the partition the content of uranium-235 increased by only 1.0002 times.

In order to increase the amount of uranium-235 even more, the resulting mixture is again passed through a partition, and the amount of uranium is again increased by 1.0002 times. Thus, to increase the uranium-235 content to 99%, it was necessary to pass the gas through 4000 filters. This took place at a huge gaseous diffusion plant in Oak Ridge.

In 1940, under the leadership of Ernest Lawrence, research began on the separation of uranium isotopes by the electromagnetic method at the University of California. It was necessary to find physical processes that would allow isotopes to be separated using the difference in their masses. Lawrence attempted to separate isotopes using the principle of a mass spectrograph, an instrument used to determine the masses of atoms.

The principle of its operation was as follows: pre-ionized atoms were accelerated by an electric field and then passed through a magnetic field, in which they described circles located in a plane perpendicular to the direction of the field. Since the radii of these trajectories were proportional to the mass, light ions ended up on circles of smaller radius than heavy ones. If traps were placed along the path of the atoms, then different isotopes could be collected separately in this way.

That was the method. In laboratory conditions it gave good results. But building a facility where isotope separation could be carried out on an industrial scale proved extremely difficult. However, Lawrence eventually managed to overcome all difficulties. The result of his efforts was the appearance of calutron, which was installed in a giant plant in Oak Ridge.

This electromagnetic plant was built in 1943 and turned out to be perhaps the most expensive brainchild of the Manhattan Project. Lawrence's method required a large number of complex, not yet developed devices involving high voltage, high vacuum and strong magnetic fields. The scale of the costs turned out to be enormous. Calutron had a giant electromagnet, the length of which reached 75 m and weighed about 4000 tons.

Several thousand tons of silver wire were used for the windings for this electromagnet.

The entire work (not counting the cost of $300 million in silver, which the State Treasury provided only temporarily) cost $400 million. The Ministry of Defense paid 10 million for the electricity consumed by calutron alone. Much of the equipment at the Oak Ridge plant was superior in scale and precision to anything that had ever been developed in this field of technology.

But all these costs were not in vain. Having spent a total of about 2 billion dollars, US scientists by 1944 created a unique technology for uranium enrichment and plutonium production. Meanwhile, at the Los Alamos laboratory they were working on the design of the bomb itself. The principle of its operation was in general terms clear for a long time: the fissile substance (plutonium or uranium-235) had to be transferred to a critical state at the moment of explosion (for a chain reaction to occur, the charge mass should be even noticeably greater than the critical one) and irradiated with a neutron beam, which entailed is the beginning of a chain reaction.

According to calculations, the critical mass of the charge exceeded 50 kilograms, but they were able to significantly reduce it. In general, the value of the critical mass is strongly influenced by several factors. The larger the surface area of ​​the charge, the more neutrons are uselessly emitted into the surrounding space. A sphere has the smallest surface area. Consequently, spherical charges, other things being equal, have the smallest critical mass. In addition, the value of the critical mass depends on the purity and type of fissile materials. It is inversely proportional to the square of the density of this material, which allows, for example, by doubling the density, reducing the critical mass by four times. The required degree of subcriticality can be obtained, for example, by compacting the fissile material due to the explosion of a charge of a conventional explosive made in the form of a spherical shell surrounding the nuclear charge. The critical mass can also be reduced by surrounding the charge with a screen that reflects neutrons well. Lead, beryllium, tungsten, natural uranium, iron and many others can be used as such a screen.

One possible design of an atomic bomb consists of two pieces of uranium, which, when combined, form a mass greater than critical. In order to cause a bomb explosion, you need to bring them closer together as quickly as possible. The second method is based on the use of an inward-converging explosion. In this case, a stream of gases from a conventional explosive was directed at the fissile material located inside and compressed it until it reached a critical mass. Combining a charge and intensely irradiating it with neutrons, as already mentioned, causes a chain reaction, as a result of which in the first second the temperature increases to 1 million degrees. During this time, only about 5% of the critical mass managed to separate. The rest of the charge in early bomb designs evaporated without
any benefit.

The first atomic bomb in history (it was given the name Trinity) was assembled in the summer of 1945. And on June 16, 1945, the first atomic explosion on Earth was carried out at the nuclear test site in the Alamogordo desert (New Mexico). The bomb was placed in the center of the test site on top of a 30-meter steel tower. Recording equipment was placed around it at a great distance. There was an observation post 9 km away, and a command post 16 km away. The atomic explosion made a stunning impression on all witnesses to this event. According to eyewitnesses' descriptions, it felt as if many suns had united into one and illuminated the test site at once. Then a huge fireball appeared over the plain and a round cloud of dust and light began to rise towards it slowly and ominously.

Taking off from the ground, this fireball soared to a height of more than three kilometers in a few seconds. With every moment it grew in size, soon its diameter reached 1.5 km, and it slowly rose into the stratosphere. Then the fireball gave way to a column of billowing smoke, which stretched to a height of 12 km, taking the shape of a giant mushroom. All this was accompanied by a terrible roar, from which the earth shook. The power of the exploding bomb exceeded all expectations.

As soon as the radiation situation allowed, several Sherman tanks, lined with lead plates on the inside, rushed to the area of ​​the explosion. On one of them was Fermi, who was eager to see the results of his work. What appeared before his eyes was a dead, scorched earth, on which all living things had been destroyed within a radius of 1.5 km. The sand had baked into a glassy greenish crust that covered the ground. In a huge crater lay the mangled remains of a steel support tower. The force of the explosion was estimated at 20,000 tons of TNT.

The next step was to be the combat use of the bomb against Japan, which, after the surrender of Nazi Germany, alone continued the war with the United States and its allies. There were no launch vehicles at that time, so the bombing had to be carried out from an airplane. The components of the two bombs were transported with great care by the cruiser Indianapolis to Tinian Island, where the 509th Combined Air Force Group was based. These bombs differed somewhat from each other in the type of charge and design.

The first bomb, “Baby,” was a large-sized aerial bomb with an atomic charge made of highly enriched uranium-235. Its length was about 3 m, diameter - 62 cm, weight - 4.1 tons.

The second bomb - "Fat Man" - with a charge of plutonium-239 was egg-shaped with a large stabilizer. Its length
was 3.2 m, diameter 1.5 m, weight - 4.5 tons.

On August 6, Colonel Tibbets' B-29 Enola Gay bomber dropped "Little Boy" on the major Japanese city of Hiroshima. The bomb was lowered by parachute and exploded, as planned, at an altitude of 600 m from the ground.

The consequences of the explosion were terrible. Even for the pilots themselves, the sight of a peaceful city destroyed by them in an instant made a depressing impression. Later, one of them admitted that at that second they saw the worst thing a person can see.

For those who were on earth, what was happening resembled true hell. First of all, a heat wave passed over Hiroshima. Its effect lasted only a few moments, but was so powerful that it melted even tiles and quartz crystals in granite slabs, turned telephone poles at a distance of 4 km into coal and, finally, incinerated human bodies so much that only shadows remained from them on the asphalt of the pavements or on the walls of houses. Then a monstrous gust of wind burst out from under the fireball and rushed over the city at a speed of 800 km/h, destroying everything in its path. Houses that could not withstand his furious onslaught collapsed as if knocked down. There is not a single intact building left in the giant circle with a diameter of 4 km. A few minutes after the explosion, black radioactive rain fell over the city - this moisture turned into steam condensed in the high layers of the atmosphere and fell to the ground in the form of large drops mixed with radioactive dust.

After the rain, a new gust of wind hit the city, this time blowing in the direction of the epicenter. It was weaker than the first, but still strong enough to uproot trees. The wind fanned a gigantic fire in which everything that could burn burned. Of the 76 thousand buildings, 55 thousand were completely destroyed and burned. Witnesses of this terrible catastrophe recalled human torches from which burnt clothes fell to the ground along with rags of skin, and crowds of maddened people covered with terrible burns who rushed screaming through the streets. There was a suffocating stench of burnt human flesh in the air. There were people lying everywhere, dead and dying. There were many who were blind and deaf and, poking in all directions, could not make out anything in the chaos that reigned around them.

The unfortunate people, who were located at a distance of up to 800 m from the epicenter, literally burned out in a split second - their insides evaporated and their bodies turned into lumps of smoking coals. Those located 1 km from the epicenter were affected by radiation sickness in an extremely severe form. Within a few hours, they began to vomit violently, their temperature jumped to 39-40 degrees, and they began to experience shortness of breath and bleeding. Then non-healing ulcers appeared on the skin, the composition of the blood changed dramatically, and hair fell out. After terrible suffering, usually on the second or third day, death occurred.

In total, about 240 thousand people died from the explosion and radiation sickness. About 160 thousand received radiation sickness in a milder form - their painful death was delayed by several months or years. When news of the disaster spread throughout the country, all of Japan was paralyzed with fear. It increased further after Major Sweeney's Box Car dropped a second bomb on Nagasaki on August 9. Several hundred thousand inhabitants were also killed and injured here. Unable to resist the new weapons, the Japanese government capitulated - the atomic bomb ended World War II.

War is over. It lasted only six years, but managed to change the world and people almost beyond recognition.

Human civilization before 1939 and human civilization after 1945 are strikingly different from each other. There are many reasons for this, but one of the most important is the emergence of nuclear weapons. It can be said without exaggeration that the shadow of Hiroshima lies over the entire second half of the 20th century. It became a deep moral burn for many millions of people, both contemporaries of this catastrophe and those born decades after it. Modern man can no longer think about the world the way they thought about it before August 6, 1945 - he understands too clearly that this world can turn into nothing in a few moments.

Modern man cannot look at war the way his grandfathers and great-grandfathers did - he knows for sure that this war will be the last, and there will be neither winners nor losers in it. Nuclear weapons have left their mark on all spheres of public life, and modern civilization cannot live by the same laws as sixty or eighty years ago. No one understood this better than the creators of the atomic bomb themselves.

"People of our planet , wrote Robert Oppenheimer, must unite. The horror and destruction sown by the last war dictate this thought to us. The explosions of atomic bombs proved it with all cruelty. Other people at other times have already said similar words - only about other weapons and about other wars. They weren't successful. But anyone who today would say that these words are useless is misled by the vicissitudes of history. We cannot be convinced of this. The results of our work leave humanity no choice but to create a united world. A world based on legality and humanity."

Changes in US military doctrine between 1945 and 1996 and basic concepts

On the territory of the United States, in Los Alamos, in the desert expanses of New Mexico, an American nuclear center was created in 1942. At its base, work began on the creation of a nuclear bomb. The overall management of the project was entrusted to the talented nuclear physicist R. Oppenheimer. Under his leadership, the best minds of that time were gathered not only in the USA and England, but in almost all of Western Europe. A huge team worked on the creation of nuclear weapons, including 12 Nobel Prize laureates. There was no shortage of financial resources.

By the summer of 1945, the Americans managed to assemble two atomic bombs, called “Baby” and “Fat Man”. The first bomb weighed 2,722 kg and was filled with enriched Uranium-235. “Fat Man” with a charge of Plutonium-239 with a power of more than 20 kt had a mass of 3175 kg. On June 16, the first test site of a nuclear device took place, timed to coincide with a meeting of the leaders of the USSR, USA, Great Britain and France.

By this time, relations between former comrades had changed. It should be noted that the United States, as soon as it had the atomic bomb, sought a monopoly on its possession in order to deprive other countries of the opportunity to use atomic energy at their discretion.

US President G. Truman became the first political leader to decide to use nuclear bombs. From a military point of view, there was no need for such bombing of densely populated Japanese cities. But political motives during this period prevailed over military ones. The leadership of the United States strove for supremacy throughout the post-war world, and nuclear bombing, in their opinion, should have been a significant reinforcement of these aspirations. To this end, they began to push for the adoption of the American “Baruch Plan,” which would have secured for the United States a monopoly on atomic weapons, in other words, “absolute military superiority.”

The fatal hour has arrived. On August 6 and 9, the crews of the B-29 "Enola Gay" and "Bocks car" aircraft dropped their deadly payload on the cities of Hiroshima and Nagasaki. The total loss of life and the scale of destruction from these bombings are characterized by the following figures: 300 thousand people died instantly from thermal radiation (temperature about 5000 degrees C) and the shock wave, another 200 thousand were injured, burned, or exposed to radiation. On an area of ​​12 sq. km, all buildings were completely destroyed. In Hiroshima alone, out of 90 thousand buildings, 62 thousand were destroyed. These bombings shocked the whole world. It is believed that this event marked the beginning of the nuclear arms race and the confrontation between the two political systems of that time at a new qualitative level.

The development of American strategic offensive weapons after the Second World War was carried out depending on the provisions of military doctrine. Its political side determined the main goal of the US leadership - achieving world domination. The main obstacle to these aspirations was considered to be the Soviet Union, which in their opinion should have been eliminated. Depending on the balance of power in the world, the achievements of science and technology, its basic provisions changed, which was correspondingly reflected in the adoption of certain strategic strategies (concepts). Each subsequent strategy did not completely replace the one that preceded it, but only modernized it, mainly in determining the ways of building the Armed Forces and methods of waging war.

From mid-1945 to 1953, the American military-political leadership in matters of building strategic nuclear forces (SNF) proceeded from the fact that the United States had a monopoly on nuclear weapons and could achieve world domination by eliminating the USSR during a nuclear war. Preparations for such a war began almost immediately after the defeat of Nazi Germany. This is evidenced by the directive of the Joint Military Planning Committee No. 432/d dated December 14, 1945, which set the task of preparing the atomic bombing of 20 Soviet cities - the main political and industrial centers of the Soviet Union. At the same time, it was planned to use the entire stock of atomic bombs available at that time (196 pieces), the carriers of which were modernized B-29 bombers. The method of their use was also determined - a sudden atomic “first strike”, which should confront the Soviet leadership with the fact that further resistance was futile.

The political justification for such actions is the thesis of the “Soviet threat,” one of the main authors of which can be considered the US Charge d’Affaires in the USSR, J. Kennan. It was he who sent a “long telegram” to Washington on February 22, 1946, where in eight thousand words he outlined the “vital threat” that allegedly loomed over the United States and proposed a strategy for confrontation with the Soviet Union.

President G. Truman gave instructions to develop a doctrine (later called the “Truman Doctrine”) of pursuing a policy from a position of strength in relation to the USSR. To centralize planning and increase the effectiveness of the use of strategic aviation, in the spring of 1947, the Strategic Aviation Command (SAC) was created. At the same time, the task of improving strategic aviation technology is being implemented at an accelerated pace.

By mid-1948, the Committee of Chiefs of Staff had drawn up a plan for a nuclear war with the USSR, codenamed “Chariotir”. It stipulated that the war should begin "with concentrated attacks using atomic bombs against government, political and administrative centers, industrial cities and selected oil refineries from bases in the Western Hemisphere and England." In the first 30 days alone, it was planned to drop 133 nuclear bombs on 70 Soviet cities.

However, as American military analysts calculated, this was not enough to achieve a quick victory. They believed that during this time the Soviet Army would be able to capture key areas of Europe and Asia. In early 1949, a special committee of senior Army, Air Force, and Navy officials was created under the leadership of Lieutenant General H. Harmon, which was tasked with trying to assess the political and military consequences of the planned atomic attack on the Soviet Union from the air. The committee's conclusions and calculations clearly indicated that the United States was not yet ready for a nuclear war.

The committee's conclusions stated that it was necessary to increase the quantitative composition of the SAC, increase its combat capabilities, and replenish nuclear arsenals. To ensure the delivery of a massive nuclear strike by air, the United States needs to create a network of bases along the borders of the USSR, from which bombers carrying nuclear weapons could carry out combat missions along the shortest routes to planned targets on Soviet territory. It is necessary to launch serial production of heavy strategic intercontinental bombers B-36, capable of operating from bases on American territory.

The message that the Soviet Union had mastered the secret of nuclear weapons caused the US ruling circles to want to start a preventive war as quickly as possible. The Troyan plan was developed, which envisaged the start of hostilities on January 1, 1950. At that time, SAC had 840 strategic bombers in combat units, 1,350 in reserve, and over 300 atomic bombs.

To assess its viability, the Committee of Chiefs of Staff ordered Lieutenant General D. Hull's group to test the chances of disabling the nine most important strategic areas on the territory of the Soviet Union in staff games. Having lost the air offensive against the USSR, Hull analysts summed it up: the probability of achieving these goals is 70%, which would entail the loss of 55% of the available bomber force. It turned out that US strategic aviation in this case would very quickly lose its combat effectiveness. Therefore, the question of preventive war was dropped in 1950. Soon the American leadership was able to verify in practice the correctness of such assessments. During the Korean War that began in 1950, B-29 bombers suffered heavy losses from fighter jet attacks.

But the situation in the world was changing rapidly, which was reflected in the American strategy of “massive retaliation” adopted in 1953. It was based on the superiority of the United States over the USSR in the number of nuclear weapons and the means of their delivery. It was envisaged to wage a general nuclear war against the countries of the socialist camp. Strategic aviation was considered the main means of achieving victory, for the development of which up to 50% of the financial resources allocated to the Ministry of Defense for the purchase of weapons were allocated.

In 1955, SAC had 1,565 bombers, 70% of which were B-47 jets, and 4,750 nuclear bombs with yields ranging from 50 kt to 20 mt. In the same year, the B-52 heavy strategic bomber was put into service, which gradually became the main intercontinental carrier of nuclear weapons.

At the same time, the military-political leadership of the United States is beginning to realize that in the context of the rapid increase in the capabilities of Soviet air defense systems, heavy bombers will not be able to solve the problem of achieving victory in a nuclear war alone. In 1958, medium-range ballistic missiles "Thor" and "Jupiter" entered service and were deployed in Europe. A year later, the first Atlas-D intercontinental missiles were put on combat duty, and the nuclear submarine J. Washington" with Polaris-A1 missiles.

With the advent of ballistic missiles in the strategic nuclear forces, the United States' ability to launch a nuclear strike increases significantly. However, in the USSR, by the end of the 50s, intercontinental carriers of nuclear weapons were being created, capable of delivering a retaliatory strike on the territory of the United States. The Pentagon was particularly concerned about Soviet ICBMs. Under these conditions, the leaders of the United States considered that the strategy of “massive retaliation” did not fully correspond to modern realities and should be adjusted.

By the beginning of 1960, nuclear planning in the United States was becoming centralized. Before this, each branch of the Armed Forces planned the use of nuclear weapons independently. But the increase in the number of strategic delivery vehicles required the creation of a single body for planning nuclear operations. It became the Joint Strategic Objectives Planning Staff, subordinate to the commander of the SAC and the Committee of the Chiefs of Staff of the US Armed Forces. In December 1960, the first unified plan for waging a nuclear war was drawn up, called the “Unified Comprehensive Operational Plan” - SIOP. It envisaged, in accordance with the requirements of the “massive retaliation” strategy, waging only a general nuclear war against the USSR and China with the unlimited use of nuclear weapons (3.5 thousand nuclear warheads).

In 1961, a “flexible response” strategy was adopted, reflecting changes in official views on the possible nature of the war with the USSR. In addition to all-out nuclear war, American strategists began to accept the possibility of limited use of nuclear weapons and waging war with conventional weapons for a short period of time (no more than two weeks). The choice of methods and means of warfare had to be made taking into account the current geostrategic situation, the balance of forces and the availability of resources.

The new installations had a very significant impact on the development of American strategic weapons. Rapid quantitative growth of ICBMs and SLBMs begins. Special attention is paid to improving the latter, since they could be used as “forward-based” weapons in Europe. At the same time, the American government no longer needed to look for possible deployment areas for them and persuade the Europeans to give their consent to the use of their territory, as was the case during the deployment of medium-range missiles.

The US military-political leadership believed that it was necessary to have such a quantitative composition of strategic nuclear forces, the use of which would ensure the “guaranteed destruction” of the Soviet Union as a viable state.

In the early years of this decade, a significant force of ICBMs was deployed. So, if at the beginning of 1960 the SAC had 20 missiles of only one type - Atlas-D, then by the end of 1962 there were already 294. By this time, Atlas intercontinental ballistic missiles of the "E" modifications were put into service. and "F", "Titan-1" and "Minuteman-1A". The latest ICBMs were several orders of magnitude higher in sophistication than their predecessors. In the same year, the tenth American SSBN went on combat patrol. The total number of Polaris-A1 and Polaris-A2 SLBMs has reached 160 units. The last of the ordered B-52H heavy bombers and B-58 medium bombers entered service. The total number of bombers in the Strategic Air Command was 1,819. Thus, the American nuclear triad of strategic offensive forces (units and formations of ICBMs, nuclear missile submarines and strategic bombers) was organizationally formed, each component of which harmoniously complemented each other. It was equipped with over 6,000 nuclear warheads.

In mid-1961, the SIOP-2 plan was approved, reflecting the “flexible response” strategy. It provided for five interrelated operations to destroy the Soviet nuclear arsenal, suppress the air defense system, destroy military and government agencies and points, large groupings of troops, as well as strikes on cities. The total number of targets in the plan was 6 thousand. Among the topics, the plan's developers also took into account the possibility of the Soviet Union inflicting a retaliatory nuclear strike on US territory.

At the beginning of 1961, a commission was formed whose duties were to develop promising ways for the development of American strategic nuclear forces. Subsequently, such commissions were created regularly.

In the fall of 1962, the world again found itself on the brink of nuclear war. The outbreak of the Cuban Missile Crisis forced politicians around the world to look at nuclear weapons from a new angle. For the first time, it clearly played the role of a deterrent. The sudden appearance of Soviet medium-range missiles in Cuba for the United States and their lack of overwhelming superiority in the number of ICBMs and SLBMs over the Soviet Union made a military solution to the conflict impossible.

The American military leadership immediately announced the need for additional armament, effectively setting a course for unleashing a strategic offensive arms race (START). The wishes of the military found due support in the US Senate. Huge amounts of money were allocated for the development of strategic offensive weapons, which made it possible to qualitatively and quantitatively improve strategic nuclear forces. In 1965, the Thor and Jupiter missiles, Atlas of all modifications and Titan-1 were completely withdrawn from service. They were replaced by the Minuteman-1B and Minuteman-2 intercontinental missiles, as well as the Titan-2 heavy ICBM.

The marine component of the SNA has grown significantly quantitatively and qualitatively. Taking into account such factors as the almost undivided dominance of the US Navy and the combined NATO fleet in the vast oceans in the early 60s, the high survivability, stealth and mobility of SSBNs, the American leadership decided to significantly increase the number of deployed missile submarines that could successfully replace medium-sized missiles. range. Their main targets were to be large industrial and administrative centers of the Soviet Union and other socialist countries.

In 1967, the strategic nuclear forces had 41 SSBNs with 656 missiles, of which more than 80% were Polaris-A3 SLBMs, 1054 ICBMs and over 800 heavy bombers. After the obsolete B-47 aircraft were removed from service, the nuclear bombs intended for them were eliminated. In connection with a change in strategic aviation tactics, the B-52 was equipped with AGM-28 Hound Dog cruise missiles with a nuclear warhead.

The rapid growth in the second half of the 60s in the number of Soviet OS-type ICBMs with improved characteristics and the creation of a missile defense system made the likelihood of America achieving a quick victory in a possible nuclear war scanty.

The strategic nuclear arms race posed more and more new challenges for the US military-industrial complex. It was necessary to find a new way to quickly increase nuclear power. The high scientific and production level of leading American rocket manufacturing companies made it possible to solve this problem. The designers have found a way to significantly increase the number of nuclear charges raised without increasing the number of their carriers. Multiple warheads (MIRVs) were developed and introduced, first with dispersible warheads and then with individual guidance.

The US leadership decided that it was time to somewhat adjust the military-technical side of its military doctrine. Using the tried-and-tested thesis of the “Soviet missile threat” and “US backwardness,” it easily secured the allocation of funds for new strategic weapons. Since 1970, the deployment of the Minuteman-3 ICBM and the Poseidon-S3 SLBM with MIRV-type MIRVs began. At the same time, the obsolete Minuteman-1B and Polaris were removed from combat duty.

In 1971, the strategy of “realistic deterrence” was officially adopted. It was based on the idea of ​​nuclear superiority over the USSR. The authors of the strategy took into account the emerging equality in the number of strategic carriers between the USA and the USSR. By that time, without taking into account the nuclear forces of England and France, the following balance of strategic weapons had developed. In terms of ground-based ICBMs, the United States has 1,054 versus 1,300 in the Soviet Union, in terms of the number of SLBMs, 656 versus 300, and in terms of strategic bombers, 550 versus 145, respectively. The new strategy for the development of strategic offensive arms provided for a sharp increase in the number of nuclear warheads on ballistic missiles while simultaneously improving their tactical and technical characteristics, which was supposed to ensure qualitative superiority over the strategic nuclear forces of the Soviet Union.

The improvement of strategic offensive forces was reflected in the next plan - SIOP-4, adopted in 1971. It was developed taking into account the interaction of all components of the nuclear triad and provided for the destruction of 16 thousand targets.

But under pressure from the world community, the US leadership was forced to negotiate on nuclear disarmament. The methods of conducting such negotiations were regulated by the concept of “negotiating from a position of strength” - an integral part of the strategy of “realistic intimidation”. In 1972, the Treaty between the USA and the USSR on the Limitation of Missile Defense Systems and the Interim Agreement on Certain Measures in the Field of Limiting Strategic Offensive Arms (SALT-1) were concluded. However, the build-up of the strategic nuclear potential of opposing political systems continued.

By the mid-70s, the deployment of the Minuteman 3 and Poseidon missile systems was completed. All Lafayette-class SSBNs equipped with new missiles have been modernized. Heavy bombers were armed with SRAM nuclear guided missiles. All this led to a sharp increase in the nuclear arsenal assigned to strategic delivery vehicles. So, in five years from 1970 to 1975, the number of warheads increased from 5102 to 8500 units. The improvement of the combat control system for strategic weapons was in full swing, which made it possible to implement the principle of quickly retargeting warheads to new targets. To completely recalculate and replace the flight mission for one missile now required only a few tens of minutes, and the entire group of SNS ICBMs could be retargeted in 10 hours. By the end of 1979, this system was implemented at all intercontinental missile launchers and launch control posts. At the same time, the security of silo launchers of Minuteman ICBMs was increased.

The qualitative improvement of the US strategic offensive forces made it possible to move from the concept of “assured destruction” to the concept of “target selection,” which provided for multi-variant actions - from a limited nuclear strike with a few missiles to a massive strike against the entire complex of targeted targets. The SIOP-5 plan was drawn up and approved in 1975, which provided for attacks on military, administrative and economic targets of the Soviet Union and Warsaw Pact countries with a total number of up to 25 thousand.

The main form of use of American strategic offensive weapons was considered to be a sudden massive nuclear strike by all combat-ready ICBMs and SLBMs, as well as a certain number of heavy bombers. By this time, SLBMs had become the leading ones in the US nuclear triad. If before 1970 most of the nuclear warheads were assigned to strategic aviation, then in 1975 4,536 warheads were installed on 656 sea-based missiles (2,154 warheads on 1,054 ICBMs, and 1,800 on heavy bombers). Views on their use have also changed. In addition to striking cities, given the short flight time (12 - 18 minutes), submarine missiles could be used to destroy launching Soviet ICBMs on the active part of the trajectory or directly in launchers, preventing their launch before the approach of American ICBMs. The latter were entrusted with the task of destroying highly protected targets and, above all, silos and command posts of missile units of the Strategic Missile Forces. In this way, a Soviet retaliatory nuclear strike on US territory could have been thwarted or significantly weakened. Heavy bombers were planned to be used to destroy surviving or newly identified targets.

Since the second half of the 70s, a transformation of the views of the American political leadership on the prospects of nuclear war began. Considering the opinion of most scientists that even a retaliatory Soviet nuclear strike would be disastrous for the United States, it decided to accept the theory of limited nuclear war for one theater of war, specifically the European one. To implement it, new nuclear weapons were needed.

The administration of President J. Carter allocated funds for the development and production of the highly effective strategic sea-based Trident system. The implementation of this project was planned to be carried out in two stages. At the first it was planned to re-equip 12 SSBNs of the J. type. Madison" with Trident-C4 missiles, as well as to build and commission 8 new-generation Ohio-class SSBNs with 24 of the same missiles. At the second stage, it was planned to build 14 more SSBNs and arm all boats of this project with the new Trident-D5 SLBM with higher tactical and technical characteristics.

In 1979, President J. Carter decides on the full-scale production of the Peacekeeper (MX) intercontinental ballistic missile, which in its characteristics was supposed to surpass all existing Soviet ICBMs. Its development has been carried out since the mid-70s, along with the Pershing-2 MRBM and a new type of strategic weapons - long-range ground- and air-launched cruise missiles.

With the coming to power of the administration of President R. Reagan, the “doctrine of neo-globalism” was born, reflecting the new views of the US military-political leadership on the path to achieving world domination. It provided for a wide range of measures (political, economic, ideological, military) to “throw back communism” and the direct use of military force against those countries where the United States perceived a threat to its “vital interests.” Naturally, the military-technical side of the doctrine was also adjusted. Its basis for the 80s was the strategy of “direct confrontation” with the USSR on a global and regional scale, aimed at achieving “complete and undeniable military superiority of the United States.”

Soon, the Pentagon developed “Guidelines for the construction of the US armed forces” for the coming years. They, in particular, determined that in a nuclear war “the United States must prevail and be able to force the USSR to quickly cease hostilities on US terms.” Military plans provided for the conduct of both general and limited nuclear war within the framework of one theater of operations. In addition, the task was to be ready to wage an effective war from space.

Based on these provisions, concepts for the development of the SNA were developed. The concept of “strategic sufficiency” required having such a combat composition of strategic delivery vehicles and nuclear warheads for them in order to ensure the “deterrence” of the Soviet Union.” The concept of “active counteraction” provided for ways to ensure flexibility in the use of strategic offensive forces in any situation - from a single use of nuclear weapons to the use of the entire nuclear arsenal.

In March 1980, the president approved the SIOP-5D plan. The plan provided for three options for nuclear strikes: preventive, retaliatory, and retaliatory. The number of targets was 40 thousand, which included 900 cities with a population of over 250 thousand each, 15 thousand industrial and economic facilities, 3,500 military targets on the territory of the USSR, Warsaw Pact countries, China, Vietnam and Cuba.

In early October 1981, President Reagan announced his “strategic program” for the 1980s, which contained guidelines for further building up strategic nuclear capabilities. The last hearings on this program took place at six meetings of the US Congress Committee on Military Affairs. Representatives of the President, the Ministry of Defense, and leading scientists in the field of weapons were invited to them. As a result of comprehensive discussions of all structural elements, the program for building up strategic weapons was approved. In accordance with it, starting in 1983, 108 Pershing-2 MRBM launchers and 464 BGM-109G ground-based cruise missiles were deployed in Europe as forward-based nuclear weapons.

In the second half of the 80s, another concept was developed - “substantial equivalence”. It determined how, in the context of the reduction and elimination of some types of strategic offensive arms, by improving the combat characteristics of others, to ensure qualitative superiority over the strategic nuclear forces of the USSR.

Since 1985, the deployment of 50 silo-based MX ICBMs began (another 50 missiles of this type in a mobile version were planned to be put on combat duty in the early 90s) and 100 B-1B heavy bombers. Production of the BGM-86 air-launched cruise missiles to equip 180 B-52 bombers was in full swing. A new MIRV with more powerful warheads was installed on the 350 Minuteman-3 ICBMs, while the control system was modernized.

An interesting situation arose after the deployment of Pershing-2 missiles on the territory of West Germany. Formally, this group was not part of the US National Security Council and was the nuclear weapon of the Supreme Allied Commander of NATO in Europe (this position has always been occupied by US representatives). The official version for the world community was that its deployment in Europe was a reaction to the appearance of RSD-10 (SS-20) missiles in the Soviet Union and the need to rearm NATO in the face of a missile threat from the East. In fact, the reason was, of course, different, which was confirmed by the Supreme Commander of NATO Allied Armed Forces in Europe, General B. Rogers. He said in one of his speeches in 1983: “Most people believe that we are modernizing our weapons because of the SS-20 missiles. We would have carried out modernization even if there were no SS-20 missiles.”

The main purpose of the Pershings (taken into account in the SIOP plan) was to deliver a “decapitation strike” on the command posts of strategic formations of the USSR Armed Forces and Strategic Missile Forces in Eastern Europe, which was supposed to disrupt the Soviet retaliatory strike. To achieve this, they had all the necessary tactical and technical characteristics: short approach time (8-10 minutes), high shooting accuracy and a nuclear charge capable of hitting highly protected targets. Thus, it became clear that they were intended to solve strategic offensive tasks.

Ground-launched cruise missiles, also considered NATO nuclear weapons, became dangerous weapons. But their use was envisaged in accordance with the SIOP plan. Their main advantage was high shooting accuracy (up to 30 m) and stealth flight, which took place at an altitude of several tens of meters, which, combined with a small effective dispersion area, made interception of such missiles by an air defense system extremely difficult. The targets of destruction for the Kyrgyz Republic could be any highly protected pinpoint targets such as command posts, silos, etc.

However, by the end of the 80s, the USA and the USSR had accumulated such a huge nuclear potential that it had long outgrown reasonable limits. A situation arose where it was necessary to make a decision on what to do next. The situation was aggravated by the fact that half of the ICBMs (Minuteman-2 and part of Minuteman-3) had been in operation for 20 years or more. Keeping them in combat-ready condition became more and more expensive every year. Under these conditions, the country's leadership decided on the possibility of a 50% reduction in strategic offensive arms, subject to a reciprocal step on the part of the Soviet Union. Such an agreement was concluded at the end of July 1991. Its provisions largely determined the path of development of strategic weapons in the 90s. An instruction was given for the development of such strategic offensive weapons, so that in order to fend off the threat from them, the USSR would need to spend large financial and material resources.

The situation changed radically after the collapse of the Soviet Union. As a result, the United States achieved world dominance and remained the only “superpower” in the world. Finally, the political part of the American military doctrine was fulfilled. But with the end of the Cold War, according to the Clinton administration, threats to US interests remained. In 1995, the report “National Military Strategy” appeared, presented by the chairman of the Joint Chiefs of Staff of the Armed Forces, and sent to Congress. It became the last of the official documents outlining the provisions of the new military doctrine. It is based on a “strategy of flexible and selective engagement.” Certain adjustments in the new strategy have been made to the content of the main strategic concepts.

The military-political leadership continues to rely on force, and the Armed Forces are preparing to wage war and achieve “victory in any wars, wherever and whenever they arise.” Naturally, the military structure is being improved, including strategic nuclear forces. They are entrusted with the task of deterring and intimidating a possible enemy, both in a period of peace and during a general or limited war using conventional weapons.

A significant place in theoretical developments is devoted to the place and methods of action of the SNA in a nuclear war. Taking into account the existing balance of forces between the United States and Russia in the field of strategic weapons, the American military-political leadership believes that goals in a nuclear war can be achieved as a result of multiple and spaced-out nuclear strikes against military and economic potential, administrative and political control. In time, these can be either proactive or reactive actions.

The following types of nuclear strikes are envisaged: selective - to hit various command and control organs, limited or regional (for example, against groupings of enemy troops during a conventional war if the situation develops unsuccessfully) and massive. In this regard, a certain reorganization of the US strategic offensive forces was carried out. Further changes in American views on the possible development and use of strategic nuclear weapons can be expected at the beginning of the next millennium.

The hydrogen bomb (Hydrogen Bomb, HB) is a weapon of mass destruction with incredible destructive power (its power is estimated at megatons of TNT). The principle of operation of the bomb and its structure are based on the use of the energy of thermonuclear fusion of hydrogen nuclei. The processes occurring during the explosion are similar to those occurring on stars (including the Sun). The first test of a VB suitable for long-distance transportation (designed by A.D. Sakharov) was carried out in the Soviet Union at a test site near Semipalatinsk.

Thermonuclear reaction

The sun contains huge reserves of hydrogen, which is under constant influence of ultra-high pressure and temperature (about 15 million degrees Kelvin). At such an extreme plasma density and temperature, the nuclei of hydrogen atoms randomly collide with each other. The result of collisions is the fusion of nuclei, and as a consequence, the formation of nuclei of a heavier element - helium. Reactions of this type are called thermonuclear fusion; they are characterized by the release of colossal amounts of energy.

The laws of physics explain the energy release during a thermonuclear reaction as follows: part of the mass of light nuclei involved in the formation of heavier elements remains unused and is converted into pure energy in colossal quantities. That is why our celestial body loses approximately 4 million tons of matter per second, while releasing a continuous flow of energy into outer space.

Isotopes of hydrogen

The simplest of all existing atoms is the hydrogen atom. It consists of just one proton, which forms the nucleus, and a single electron orbiting around it. As a result of scientific studies of water (H2O), it was found that it contains so-called “heavy” water in small quantities. It contains “heavy” isotopes of hydrogen (2H or deuterium), the nuclei of which, in addition to one proton, also contain one neutron (a particle close in mass to a proton, but devoid of charge).

Science also knows tritium, the third isotope of hydrogen, the nucleus of which contains 1 proton and 2 neutrons. Tritium is characterized by instability and constant spontaneous decay with the release of energy (radiation), resulting in the formation of a helium isotope. Traces of tritium are found in the upper layers of the Earth's atmosphere: it is there, under the influence of cosmic rays, that the molecules of gases that form air undergo similar changes. Tritium can also be produced in a nuclear reactor by irradiating the lithium-6 isotope with a powerful neutron flux.

Development and first tests of the hydrogen bomb

As a result of a thorough theoretical analysis, experts from the USSR and the USA came to the conclusion that a mixture of deuterium and tritium makes it easiest to launch a thermonuclear fusion reaction. Armed with this knowledge, scientists from the United States in the 50s of the last century began to create a hydrogen bomb. And already in the spring of 1951, a test test was carried out at the Enewetak test site (an atoll in the Pacific Ocean), but then only partial thermonuclear fusion was achieved.

A little more than a year passed, and in November 1952 the second test of a hydrogen bomb with a yield of about 10 Mt of TNT was carried out. However, that explosion can hardly be called an explosion of a thermonuclear bomb in the modern sense: in fact, the device was a large container (the size of a three-story building) filled with liquid deuterium.

Russia also took up the task of improving atomic weapons, and the first hydrogen bomb of the A.D. project. Sakharov was tested at the Semipalatinsk test site on August 12, 1953. RDS-6 (this type of weapon of mass destruction was nicknamed Sakharov’s “puff”, since its design involved the sequential placement of layers of deuterium surrounding the initiator charge) had a power of 10 Mt. However, unlike the American “three-story house,” the Soviet bomb was compact, and it could be quickly delivered to the drop site on enemy territory on a strategic bomber.

Accepting the challenge, the United States in March 1954 exploded a more powerful aerial bomb (15 Mt) at a test site on Bikini Atoll (Pacific Ocean). The test caused the release of a large amount of radioactive substances into the atmosphere, some of which fell in precipitation hundreds of kilometers from the epicenter of the explosion. The Japanese ship "Lucky Dragon" and instruments installed on Rogelap Island recorded a sharp increase in radiation.

Since the processes that occur during the detonation of a hydrogen bomb produce stable, harmless helium, it was expected that radioactive emissions should not exceed the level of contamination from an atomic fusion detonator. But calculations and measurements of actual radioactive fallout varied greatly, both in quantity and composition. Therefore, the US leadership decided to temporarily suspend the design of this weapon until its impact on the environment and humans is fully studied.

Video: tests in the USSR

Tsar Bomba - thermonuclear bomb of the USSR

The USSR marked the final point in the chain of hydrogen bomb production when, on October 30, 1961, a 50-megaton (the largest in history) “Tsar Bomb” was tested on Novaya Zemlya - the result of many years of work by A.D.’s research group. Sakharov. The explosion occurred at an altitude of 4 kilometers, and the shock wave was recorded three times by instruments around the globe. Despite the fact that the test did not reveal any failures, the bomb never entered service. But the very fact that the Soviets possessed such weapons made an indelible impression on the whole world, and the United States stopped accumulating the tonnage of its nuclear arsenal. Russia, in turn, decided to abandon the introduction of warheads with hydrogen charges into combat duty.

A hydrogen bomb is a complex technical device, the explosion of which requires the sequential occurrence of a number of processes.

First, the initiator charge located inside the shell of the VB (miniature atomic bomb) detonates, resulting in a powerful release of neutrons and the creation of the high temperature required to begin thermonuclear fusion in the main charge. Massive neutron bombardment of the lithium deuteride insert (obtained by combining deuterium with the lithium-6 isotope) begins.

Under the influence of neutrons, lithium-6 splits into tritium and helium. The atomic fuse in this case becomes a source of materials necessary for thermonuclear fusion to occur in the detonated bomb itself.

A mixture of tritium and deuterium triggers a thermonuclear reaction, causing the temperature inside the bomb to rapidly increase, and more and more hydrogen is involved in the process.
The principle of operation of a hydrogen bomb implies the ultra-fast occurrence of these processes (the charge device and the layout of the main elements contribute to this), which to the observer appear instantaneous.

Superbomb: fission, fusion, fission

The sequence of processes described above ends after the start of the reaction of deuterium with tritium. Next, it was decided to use nuclear fission rather than fusion of heavier ones. After the fusion of tritium and deuterium nuclei, free helium and fast neutrons are released, the energy of which is sufficient to initiate the fission of uranium-238 nuclei. Fast neutrons are capable of splitting atoms from the uranium shell of a superbomb. The fission of a ton of uranium generates energy of about 18 Mt. In this case, energy is spent not only on creating a blast wave and releasing a colossal amount of heat. Each uranium atom decays into two radioactive “fragments.” A whole “bouquet” of various chemical elements (up to 36) and about two hundred radioactive isotopes is formed. It is for this reason that numerous radioactive fallouts are formed, recorded hundreds of kilometers from the epicenter of the explosion.

After the fall of the Iron Curtain, it became known that the USSR was planning to develop a “Tsar Bomb” with a capacity of 100 Mt. Due to the fact that at that time there was no aircraft capable of carrying such a massive charge, the idea was abandoned in favor of a 50 Mt bomb.

Consequences of a hydrogen bomb explosion

Shock wave

The explosion of a hydrogen bomb entails large-scale destruction and consequences, and the primary (obvious, direct) impact is threefold. The most obvious of all direct impacts is a shock wave of ultra-high intensity. Its destructive ability decreases with distance from the epicenter of the explosion, and also depends on the power of the bomb itself and the height at which the charge detonated.

Thermal effect

The effect of the thermal impact of an explosion depends on the same factors as the power of the shock wave. But one more thing is added to them - the degree of transparency of air masses. Fog or even slight cloudiness sharply reduces the radius of damage over which a thermal flash can cause serious burns and loss of vision. The explosion of a hydrogen bomb (more than 20 Mt) generates an incredible amount of thermal energy, sufficient to melt concrete at a distance of 5 km, evaporate almost all the water from a small lake at a distance of 10 km, destroy enemy personnel, equipment and buildings at the same distance . In the center, a funnel with a diameter of 1-2 km and a depth of up to 50 m is formed, covered with a thick layer of glassy mass (several meters of rocks with a high sand content melt almost instantly, turning into glass).

According to calculations based on real-life tests, people have a 50% chance of surviving if they:

• They are located in a reinforced concrete shelter (underground) 8 km from the epicenter of the explosion (EV);
• They are located in residential buildings at a distance of 15 km from the EV;
• They will find themselves in an open area at a distance of more than 20 km from the EV with poor visibility (for a “clean” atmosphere, the minimum distance in this case will be 25 km).

With distance from EVs, the likelihood of surviving in people who find themselves in open areas increases sharply. So, at a distance of 32 km it will be 90-95%. A radius of 40-45 km is the limit for the primary impact of an explosion.

Fire ball

Another obvious impact from the explosion of a hydrogen bomb is self-sustaining firestorms (hurricanes), formed as a result of colossal masses of combustible material being drawn into the fireball. But, despite this, the most dangerous consequence of the explosion in terms of impact will be radiation contamination of the environment for tens of kilometers around.

Fallout

The fireball that appears after the explosion is quickly filled with radioactive particles in huge quantities (products of the decay of heavy nuclei). The particle size is so small that when they enter the upper atmosphere, they can stay there for a very long time. Everything that the fireball reaches on the surface of the earth instantly turns into ash and dust, and then is drawn into the pillar of fire. Flame vortices mix these particles with charged particles, forming a dangerous mixture of radioactive dust, the process of sedimentation of the granules of which lasts for a long time.

Coarse dust settles quite quickly, but fine dust is carried by air currents over vast distances, gradually falling out of the newly formed cloud. Large and most charged particles settle in the immediate vicinity of the EC; ash particles visible to the eye can still be found hundreds of kilometers away. They form a deadly cover, several centimeters thick. Anyone who gets close to him risks receiving a serious dose of radiation.

Smaller and indistinguishable particles can “float” in the atmosphere for many years, repeatedly circling the Earth. By the time they fall to the surface, they have lost a fair amount of radioactivity. The most dangerous is strontium-90, which has a half-life of 28 years and generates stable radiation throughout this time. Its appearance is detected by instruments around the world. “Landing” on grass and foliage, it becomes involved in food chains. For this reason, examinations of people located thousands of kilometers from the test sites reveal strontium-90 accumulated in the bones. Even if its content is extremely low, the prospect of being a “landfill for storing radioactive waste” does not bode well for a person, leading to the development of bone malignancies. In regions of Russia (as well as other countries) close to the sites of test launches of hydrogen bombs, an increased radioactive background is still observed, which once again proves the ability of this type of weapon to leave significant consequences.

Video about the hydrogen bomb

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