40级串联FLTD驱动杆箍缩二极管的箍缩特性模拟

Electron beam pinch simulative study of rod-pinch diode driven by 40-stage FLTD module

快放电直线型变压器(FLTD)直接驱动阳极杆箍缩二极管(RPD)技术的紧凑型闪光照相装置是当前研究的热点。采用数值模拟(PIC)方法,建立了40级串联FLTD的粒子模拟模型,研究了不同触发时序下次级分别为正、负极性时的输出特性;在此基础上,初步模拟了RPD在4 MV电压下的箍缩特性。结果为:在脉冲源参数和负载相同的情况下,次级MITL内筒为正极性时的阴极传导电流比例明显低于负极性情况;在脉冲源输出电压4MV时,RPD电子束箍缩良好,电子束的轴向分布较为集中,38%的电子束沉积在距离针尖1.5mm的区域。

Experimental results of instability developments of 8 mm tungsten wire array Z-pinches on the 1.5 MA level,100 ns rise-time ＂Qiangguang-Ⅰ ＂facility are presented.The dominated instability wavelength for imploding 8 mm wire arrays in early ablation regime is （0.2±0.03） mm,and it grows up to longer wavelength in later implosion and stagnation regime.An m=1 kink,when observed,is always on all frames obtained after peak power.Thus there may be some relation between the occurrence of m=1 and the termination of the rapid rise of the power pulse.