Performance improvement of BEPCII pulsed modulators

Purpose For improving a beam quality of the linear accelerator and decreasing the influence of failure recovery on the accelerator available time, a high-voltage pulse modulator system is required to enhance the stability of high-voltage pulses and maintain a low failure rate as well as a low failure recovery time, in order to implement a high-performance and stable operation.
Methods This paper systematically analyzes the current status and operating conditions of the modulator equipment of BEPCII linear accelerator and simulates the typical parameters of the modulator considering the high-voltage DC charging power supply, DC charging cables and components and pulsed hydrogen thyratron. The technical route and retrofit scheme are proposed to decrease the failure rate and its recovery time.
Results The stability of the high-voltage pulse modulator has increased by 1000 ppm, the failure rate has been decreased by two orders of magnitude, and the averaged recovery time from failures has been reduced by 94% as compared to the last operation period via implementing technical transformation with repeated exploration and experimental verification.