Nuclear fusion. Since the atomic nuclei at short distances the nuclear force of attraction, when two cores may merge, i.e., the synthesis of heavier nuclei. All atomic nuclei have a positive electrical charge and therefore repel each other at great distances from each other. In order to get closer to the nucleus and enter into a nuclear fusion reaction, they must have sufficient kinetic energy to overcome the mutual electrical repulsion, which is larger, the larger the nuclear charge.

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Therefore, the easiest way to the synthesis of light nuclei with a small electrical charge. In the laboratory, the synthesis reaction can be observed by bombarding target nuclei with fast, over clocked in a special accelerator. In nature, the fusion reaction occurs in a very hot substance, such as the interiors of stars, including the center of the Sun where the temperature is 14 million degrees and the energy of thermal motion of some the fastest particles sufficient to overcome the electrical repulsion. Nuclear fusion that occurs in hot matter, called fusion. Thermonuclear reactions taking place in the interiors of stars play a very important role in the evolution of the universe. They - the source of the nuclei of chemical elements, which are synthesized from hydrogen in stars. They - the energy source across the lines. The main source of solar energy is the reactions of the so-called proton-proton cycle, resulting in the birth of the 4 proton helium nucleus.

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The released energy is carried away in the synthesis of nuclei formed, the quanta of electromagnetic radiation, neutrons and neutrinos. By observing the flux of neutrinos from the sun, you can determine which nuclear fusion reactions, and with what intensity occur in the center. A unique feature of the fusion reactions as an energy source - a very large energy release per unit mass of the reactants - 10 million times greater than in chemical reactions. Entry into the synthesis of 1 g of hydrogen isotopes is equivalent to burning 10 tons of gasoline. Therefore, scientists have long sought to seize this tremendous source of energy. In principle, we can already get on the Earth energy fusion. Bring the matter to the stellar temperature is to use the energy of an atomic explosion. That's the way a hydrogen bomb - the most terrible weapons of modernity, in which the detonation of a nuclear fuse leads to an instantaneous heating of the deuterium-tritium mixture and subsequent thermonuclear explosion. But not to such an uncontrolled synthesis, is capable of destroying all life on Earth, scientists seeks. They are looking for ways to controlled thermonuclear fusion. What conditions must be fulfilled for this? First, of course, must be heated to a temperature of thermonuclear fuel, when the synthesis reaction may occur with appreciable probability. But this is not enough. It is necessary that fusion produce more energy than is expended in heating the substance, or, better yet, that being born in the synthesis of fast particles themselves to maintain the required temperature of the fuel. For this to occur, intervening in the synthesis of the substance to be reliably isolated from the ambient heat and naturally cold environments on Earth, i.e., that the cooling time, or as they say, energy confinement time, it was large enough.

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Requirements for temperature and residence time depend on the used fuel. The easiest way to carry out synthesis between the heavy isotopes of hydrogen - deuterium (D) and tritium (T). In this case the reaction is obtained by a helium nucleus (4He) and a neutron. Deuterium has on the earth in large quantities. In order to implement the D-T reaction most advantageous temperature of about 100 million degrees. The demand for energy confinement time depends on the density of the reactant, which at this temperature will inevitably be in the form of plasma, i.e., the ionized gas. Since the intensity of the thermonuclear reactions is higher, the higher plasma density.