CAJ | 학술논문

采用光学诊断和电磁测量相结合的方法对"强光一号"不同结构的水开关的放电特性进行研究,其中包括环-板结构、球-板结构及局部场增强球-板结构.通过理论模拟开关电场分布及"强光一号"加速器水开关击穿电压的实际测量可以分析不同结构的开关工作稳定性,结果表明:环-板结构的水开关具有最稳定的击穿特性,15发放电的时间抖动只有30 ns;局部场增强球-板结构水开关抖动60 ns;球-板结构水开关稳定性最差,抖动达到140 ns.利用纳秒时间分辨可见光分幅相机和光纤传感器对环-板型及局部场增强球-板结构水介质开关进行光学测量,得到了电流通道发展图像以及整个放电过程的光强变化信号.实验结果表明:环-板型水介质开关开始击穿时的平均场强约为190 kV/cm,同时存在多个放电通道,流注呈树枝状分布,其发展速度为几十cm/s.
채용광학진단화전자측량상결합적방법대"강광일호"불동결구적수개관적방전특성진행연구,기중포괄배-판결구、구-판결구급국부장증강구-판결구.통과이론모의개관전장분포급"강광일호"가속기수개관격천전압적실제측량가이분석불동결구적개관공작은정성,결과표명:배-판결구적수개관구유최은정적격천특성,15발방전적시간두동지유30 ns;국부장증강구-판결구수개관두동60 ns;구-판결구수개관은정성최차,두동체도140 ns.이용납초시간분변가견광분폭상궤화광섬전감기대배-판형급국부장증강구-판결구수개질개관진행광학측량,득도료전류통도발전도상이급정개방전과정적광강변화신호.실험결과표명:배-판형수개질개관개시격천시적평균장강약위190 kV/cm,동시존재다개방전통도,류주정수지상분포,기발전속도위궤십cm/s.
The behaviors of three kinds of self-breakdown water switches for Qiangguang-Ⅰaccelerator were studied. They have different configurations including sphere-plane structure, local field-enhanced sphere-plane structure and annulus-plane structure. By computer simulation, the electric field parameters were determined. The breakdown characteristics of the switches were tested in Qiangguang-Ⅰfacility. Experimental results of three different kinds of switches show that the annulus-plane structured has the switch stablest breakdown performance. The time jitter of the annulus-plane switch for 15 shots is only 30 ns, comparing the 60 ns and 140 ns of the local field-enhanced sphere-plane structure and the sphere-plane structure respectively.In addition to the standard electrical diagnostics, optical diagnostics of the breakdown phase were studied with a fast framing camera. The experiment results show that the average breakdown electric field of annulus-flat water switch is about 190 kV/cm, several discharging channels are observed at the same time, the streamers appear like bush and their velocity is about tens of centimeters per second.