[en] Flash I machine is a 6 MW REB accelerator. A hollow conical cathode is used to produce beam focusing in the diode and hence an intense Bremsstrahlung radiation of 250 R at 1 meter with a focus diameter of 6 mm has been obtained. Using this accelerator, radiography of high density material under jet perforation was performed. Detonation experiments was carried out in a blast chamber. Results indicate that radiographic capability of this accelerator is more than 5 cm tungsten. Details of the radiography technique are described

[en] For developing a novel high-current, long pulse width electron source, the theoretics and mechanism of the hollow cathode plasma electron-gun are analyzed in detail in this paper, the structure and the physical process of hollow cathode plasma electron-gun are also studied. This gun overcomes the limitations of most high-power microwave tubes, which employ either thermionic cathodes that produce low current-density beams because of the limitation of the space charge, or field-emission cathodes that offer high current density but provide only short pulse width because of plasma closure of the accelerating gap. In the theories studying on hollow cathode plasma electron-gun, the characteristic of the hollow-cathode discharge is introduced, the action during the forming of plasma of the stimulating electrode and the modulating anode are discussed, the movement of electrons and ions and the primary parameters are analyzed, and the formulas of the electric field, beam current density and the stabilization conditions of the beam current are also presented in this paper. The numerical simulation is carried out based on Poisson's equation, and the equations of current continuity and movement. And the optimized result is reported. On this basis, we have designed a hollow-cathode-plasma electron-gun, whose output pulse current is 2 kA, and pulse width is 1 microsecond

[en] Z-pinches have long fascinated the plasma physics. Improvements in the technology of fast pulsed electrical power have reopened interest in the field of fast, dynamic z-pinches. The authors decided building a pulsed power driver to study the fast z-pinches physics. The primary design results of the 10 MA fast z-pinch driver are given. The characteristic geometry and physical parameters are presented