The results of the development of a two-dimensional MHD code for carrying out computational studies of the dynamics of plasma current sheath in spherical chambers with a plasma focus are presented. Equations of magnetohydrodynamics with allowance for magnetic field diffusion, thermal conductivity and plasma radiation are used in this work. An implicit scheme is used in the calculation of the magnetic field, which makes it possible to describe the motion of plasma in a low-density region behind the plasma sheath. The formulas that take into account the possible appearance of anomalous resistance in the plasma are used to calculate the plasma conductivity. The neutron yield is calculated with allowance for thermonuclear and beam–target neutron generation mechanisms. The effect of the minimum residual gas density behind the plasma sheath on the cumulation of the plasma sheath is studied. The effects of magnetic field diffusion, thermal conductivity and anomalous plasma resistance on the plasma sheath dynamics are considered. The calculations are performed for two spherical plasma-focus chambers operating with currents up to 1 and 2 MA and neutron yields to 1012 and 1.5 × 1013 DT neutrons, respectively. The comparison of the calculated dependences with experimental data on the current, voltage and neutron yield made it possible to refine the parameters used in the calculations and achieve a satisfactory agreement between the simulation and experiment.

Описана передвижная электрофизическая конденсаторная установка с максимальным запасом энергии в батарее 250 кДж, генерирующая интенсивные импульсы нейтронов. Основой установки является генератор импульсов тока с емкостным накопителем электрической энергии. При начальном напряжении на конденсаторной батарее до 35 кВ установка обеспечивает протекание в газоразрядной камере с плазменным фокусом, наполненной равнокомпонентной дейтериево-тритиевой (DТ) смесью, импульсов токов амплитудой до 2 МА. При этих условиях камера способна многократно генерировать одиночные импульсы быстрых нейтронов с энергией 14.1 МэВ длительностью 70 нс и интегральным выходом более 1013 нейтронов/импульс.

Our country's science has suffered a great loss. On 25 February 1993, the prominent scientist Professor Veniamin Aronovich Tsukerman died in his eightieth year. He was the founder of our country's pulsed radiography, a Hero of Socialist Labor, an Honored Inventor of the RSFSR laureate of the Lenin Prize and of four State Prizes, and a Doctor of Technical Sciences. V. A. Tsukerman was born on 6 April 1913 in the city of Vitebsk. His working activity began in 1930 as a demonstrator in the X-ray laboratory of the Moscow Machinebuilding Institute, then he became a student in it and graduated in 1936. In 1934, while still a student, he was placed in charge of the X-ray laboratory. In 1940, the laboratory was transferred to the Institute of Mechanical Engineering of the Academy of Sciences of the USSR where Tsukerman was in charge of this laboratory until the beginning of 1947. To him belong the first publications both in our country's and in world science on radiological investigations of the phenomena of explosion and detonation, for which in 1946 he was awarded a State Prize of the USSR. In 1946, Yu. B. Khariton invited Tsukerman to participate in the development of nuclear weapons, and all his subsequent activity took place in the АН-Union Scientific Research Institute for Experimental Physics (NVIIEF) in the city of Arzamas-16 where he was in charge of one of the leading scientific research departments. As a talented experimental scientist he proposed many valuable and original ideas which form the foundation of the scientific-technological work of the VNIIEF and of a number of associated organizations. More than a hundred articles, monographs, inventions, tens of millions of rubles of economic effect—this is the sum total of his work in science and technology. He has created a major scientific school. Among the pupils of V. A. Tsukerman there are ten doctors and more than 30 candidates of science, and laureates of the Lenin and State Prizes. It is difficult to overestimate the significance of the work carried out by V. A. Tsukerman and by the scientific school founded by him in the area of creating methods and apparatus for the study of rapidly occurring processes, investigations of the state of matter at superhigh pressures and temperatures. The information needed for providing the basis for the efficient construction of the first atomic explosive was obtained by recording parameters arising for millionths of a second in shock waves with the aid of radiographic, photochronographic, and oscillographic methodologies developed under the supervision of V. A. Tsukerman. A still more weighty contribution was made by Tsukerman to the development and testing of subsequent prototypes of weapon's. Thus he together with Ya. B. ZeFdovich and A. A. Brish proposed and realized ideas and technical suggestions which significantly improved the construction and the characteristics of atomic weapons. This work was awarded State Prizes (1949, 1955) and the Lenin Prize (1960) while in 1962 he was awarded the title of Hero of Socialist Labor. V. A. Tsukerman was the founder of important directions of modern radiology in our country—creation of a highly miniaturized pulsed x-ray devices and development of powerful megavolt generators of x-rays. These devices and installations are widely used in different fields of defense technology and national economy, and have been awarded a State Prize (1978). The work of V. A. Tsukerman's school on research and development of pulsed sources of neutrons have also become widely known and acknowledged. In the 1960's Tsukerman and collaborators constructed on the basis of a Fe radioisotope sources for x-ray fluorescent analysis of rocks on Venus on the auto-