介质壁直线加速器加速单元间的电路耦合及解耦

Circuit coupling and decoupling between accelerating units of dielectric wall linear accelerator

中国工程物理研究院流体物理研究所研发的介质壁直线加速器是基于固态脉冲形成线、GaAs光导开关和高梯度绝缘介质壁三项关键技术的新型直线脉冲加速器。在加速器调试阶段,测量出获得加速的质子束流能量远低于预期值,在排除功率源负载能力因素之后,发现脉冲功率源因连接回路引起的电路耦合效应是导致束流能量低的主要原因。基于介质壁直线加速器加速单元放电回路结构的分析,确认了加速单元之间的电路耦合的必然性。并通过测量回路电流,研究了几种不同工作模式下的电路耦合效应。结合电路耦合的特点,给出了两种基于磁芯隔离的解耦方法,并测量了这两种方法的解耦效率。

The dielectric wall linear accelerator,based on technologies of solid-state pulse forming lines,photoconductive semiconductor switches and high gradient insulators,is a new concept linear accelerator being developed at Institute of Fluid Physics,CAEP.During accelerator test process,the measured energy gain of the accelerated proton beam is much lower than expected.After the exclusion of the pulsed power source factor,we find that the coupling effect induced connecting circuit is the main factor of causing low beam energy gain.Based on discharge circuit analysis of the dielectric wall linear accelerator acceleration unit,we confirm that the circuit coupling between acceleration units is inevitable.The circuit coupling of several different operation modes is studied by measuring the circuit current.According to the characteristics of the coupled circuit,we give two kind of decoupling methods based on the magnetic core isolation,and we measure the efficiency of the decoupling of the two methods.