No abstract available

[en] The basic idea of the scheme presented is to compress preliminary produced plasma in a longitudinal magnetic field by a cumulating liner. In the axial direction the plasma rests on the end-plugs, and the confinement in the radial direction is also gas-kinetic. Acceleration of the hollow cylinder-liner is achieved by the pressure of the field produced by the magnetic current, which flows along the liner (Z-pinch). The author cites the method proposed by J.G. Linhart in which the magnetic field energy is transferred to the plasma liner, which is formed by means of a snow-plow mechanism in a heavy gas. The plasma liner transmits its energy to a solid liner, by colliding with it. The advantage of this scheme consists of less rigid requirements for fast response of the energetics. Four different schemes are considered for production of a foreplasma with the required parameters in a closed cylindrical compression chamber. They are liner acceleration up to a velocity at which shock waves in a D-T mixture would produce foreplasma with the required temperature and density; use of a laser beam which is focused on the D-T target through the small hole at the end of the chamber; use of coaxial plasma accelerators with opposite injection into the chamber; plasma heating up to the required parameters at the expense of partial diffusion of accelerating current into the plasma column

[en] Experiments data are given on generation of a strong magnetic field by compressing magnetic flux with a conducting cylindrical liner accelerated under the effect of magnetic pressure (magnetodynamic cumulation). The magnetic field for the liner acceleration has been generated by a one-loop solenoid. The total power capacity of the battery for the solenoid pulse supply made Up 700 kJ. The liner is made of aluminium. The liner is 145 mm long, the wall thickness is 2 mm, external diameter is 108 mm, weight is 250 g. The initial magnetic field inside the liner (approximately 10 kGs) has been generated as a result of the 1.5x10^-2 F condenser battery discharge (190 kJ at 5 kV). Phases of aluminium liner collapse are shown. The liner kinetic energy acquired during acceleration reached 100 kJ. The experiments have shown a possibility of generating a strong magnetic field of the intensity over 10⁶ Gs as well as the magnetic field 100 times as strong

[en] The possibility of high-temperature plasma production by means of compression of a pre-heated dense plasma by liners is experimentally studied. A pulsed high-current arc in hydrogen has been employed for initial plasma production. Energy of the metal liner constricted under the effect of the magnetic field has been used then for compression. Single coil (diameter = 8 cm, length = 15 cm) generating an accelerating magnetic field is operated from a 4x10⁵ J condenser battery. Liner velocities up to 10⁵ cm/s are obtained, the moving liner kinetic energy being equal to 10⁵ J. A system for the liner acceleration is described

No abstract available

[en] The basic principles of a thermonuclear system are reported in paper. In short, they lead to the following. A plasma heating and its confinement in the radial direction is accomplished by an imploding cylindrical liner; in the axial direction of the plasma is confined by solid end plugs. A longitudinal magnetic field is used only for reducing thermal conduction losses on a wall. Radial plasma losses depend largely on the magnetic field magnitude on the plasma-liner boundary. The magnetic field strength in this region is determined by competition of three processes: the removal of magnetic field because of a hot plasma motion to the wall, the magnetic field generation due to thermo-emf near the wall and the field diffusion into the liner. If the liner resistance is low the magnetic flux is accumulated near the wall and the plasma confinement will approach to purely magnetic one. In the case of poorly-conducting liner the magnetic flux will penetrate through it and the plasma column confinement will become completely gas-kinetic. If the metal liner is used with allowance for its heating-up due to a heat flux from the plasma and the magnetic field diffusion an intermediate situation can be realized with a partial gas-kinetic confinement, which is the object of investigation of this paper

[en] Computer calculations are reported on the compression of the longitudinal magnetic field in a zeta-pinch discharge by a cumulative sheath

[en] The existence of a pair of oncoming quasi-stationary longitudinal thermonuclear combustion waves is demonstrated in a plasma column with cold, dense ends while undergoing uniform radial expansion. It is shown that if a suitable set of parameters is selected, an exponential expansion of a cylindrical column is possible, during which the temperature, density and longitudinal velocity distributions remain unchanged with time and in which a continuous inflow of thermonuclear fuel is produced by convection driven by the combustion waves near the ends of the plasma column. A numerical procedure is used to find a self-consistent distribution of fusion power in the plasma with non-local thermalization of α-particles. The usefulness of these thermonuclear combustion waves for increasing the effectiveness of an imploding liner system is discussed. (author)

[en] The interaction of a magnetized hot plasma (ωsub(e)tau sub(e)>>1) with cold plasma or a gas leads to the appearanci of a cooling wave. The transition layer between hot and cold plasma is the main source of radiation losses which should be compensated by a heat flow from the hot region. A stationary state is considered, equations are written in the system in which temperature and magnetic field profiles are steady, and the plasma flux with magnetic field passes through the cooling wave. Calculations, have been carried out on a computer. The dependence of the magnetized plasma flux velocity Vsub(r) on the ratio p/Hsub(r) is shown, where p is the pressure, Hsub(r) is the magnetic field in the hot reqion. The dependence of the characteristic dimension of the cooling wave on the magnetic field is determined for the hot plasma region. A considerable fraction of the rediation losses is shown to fall to the region of (ωsub(e)tausub(e)< or approximately)1

[en] The authors consider the effect of compressibility of the liner material on the effectiveness of the theta-pinch-and-liner system. They make numerical calculations for the compression dynamics of the liner, the results of which are represented by approximate expressions. (author)