Transformation of the Flash-Ⅱ accelerator

For the requirements of SGEMP research, the Flash-Ⅱ accelerator has been transformed to improve the simulation capability of pulsed hard X rays. A two-stage waterline together with its water switches was adopted to upgrade the driver. The experimental results show that the designed performance has been achieved. With a much shorter risetime of 30 ns, the transformed accelerator now can reliably output a 60 ns width voltage from 650 kV to 1.3 MV. Using the accelerator, a diode with two stages in series has been developed and 53 ns pulse X-rays with risetime of 29 ns have been obtained successfully. (authors)