提出了一种结合高耦合Tesla变压器和螺旋形成线(FL)的紧凑型高压纳秒脉冲发生器,由内置Tesla变压器充电的螺旋FL包含外屏蔽筒、螺旋中筒和内导体筒,内外筒的两端均短路连接,螺旋中筒的一端开路,另一端穿过内外筒短路端面并与主开关电极连接。该结构简单紧凑、易于实现,输出脉冲前沿快、平顶好。给出了一组10 GW功率、百ns脉宽的FL设计,采用Midel 7131合成酯绝缘介质,FL外筒内径0.88 m,长度2 m。
This paper presents a compact high-voltage nanosecond pulse generator, which combines high-coupling Tesla transformer with spiral forming line (FL). The spiral FL charged from the build-in Tesla transformer includes an outer shield cylinder, a spiral middle cylinder, and an inner conductor cylinder. At both sides of the FL, inner and outer cylinders are all short-circuit connected. One end of the spiral middle cylinder is open-circuit connected, the other end passes through short-circuit interface of inner and outer cylinders, and is connected to one electrode of the main switch. Such structure is simple and compact, which can generate high-quality pulse waveform with fast front and flat top. One design example of FL with Midel 7131 synthetic ester dielectric is given in the end of this paper, and the calculative and simulative results indicate that a pulse with 10 GW peak power and 100 ns width can be generated by the 2 m long FL with 0.88 m interior diameter of outer cylinder.