A voltage control section for controlling a pulsed acceleration voltage applied between a photoelectron releasing layer and an X-ray target in order to accelerate a photoelectron is further provided, so that the acceleration voltage is maintained at a pulse top voltage until the X-ray target is bombarded...http://www.google.es/patents/US6516048?utm_source=gb-gplus-sharePatente US6516048 - X-ray generator
