A long pulse power supply has been designed and simulation calculated for linac.For the high-energy accelerator

a high efficiency power supply is desired.The conceptual power supply uses only 30 μF storage capacitor that charged directly to the working voltage of klystron via DC supply and then droops approximately 5.59%

3.02% and 1.52% during the 1.5ms

800 μ s and 400 μ s pulse widths.The droops are compensated for by the use of a compensation circuit

and the output pulses are therefore flat to within ±0.50% during those pulse widths.This article is the description of the long pulse modulator calculation.