对PTS装置分层真空轴向绝缘堆的设计和分析方法进行了研究。利用全电路模拟方法得到了绝缘堆各层的电压波形。利用静电场数值模拟方法,对每层堆中的绝缘环、电极环、均压环、场调整环以及两端接口部分的形状都进行了设计和优化。2维和3维静电场模拟结果表明,绝缘堆的设计能够满足静电场设计要求。采用2维PIC程序初步计算了绝缘堆金属均压环真空侧电子发射对电压分配不均压度的影响,计算结果表明,真空侧的电子发射会较大地影响绝缘堆电压分配的均匀度,进而对绝缘堆的全堆闪络概率造成较大的影响。

The design and analysis method of PTS vacuum insulator stack are presented. The voltage waveforms of each level are obtained by full circuit simulation. The shapes of the components (grading rings,insulator rings,anode and cathode conductors) in each level and the design of the water and MITLs interfaces,were optimized by the electrostatic analysis code. The 3-D and 2-D voltage variation of each insulator of level-A is compared,and the difference is neglectable. The time-dependent performance of insulator stack was evaluated using 2-D PIC code. The voltage variation change caused by electron emission on vacuum side of grading rings is serious,and can greatly affect the whole stack flashover probability.