Focusing of megaamper electron beam in gas cell for production of flash X-ray source

One of the important problems to be solved in development of the intense source of flash X-rays is a choice of the optimum construction of a high-current diode at the exit of an electron accelerator. In this report, the results of numerical investigations of megaamper relativistic electron beam (REB) generation and focusing in a compound diode are discussed. The diode consists of a vacumn field-emission annular cathode, a planar anode and a gas cell inserted between the anode foil and a target.