Mao Jiubing, Wang Xin, Tang Dan, Lv Huayi, Li Chengxin, Shao Yanhua, Qin Lan
Key Lab of Optoelectronic Technology and Systems, Education Ministry of China, Chongqing University, Chongqing 400044, China.
Rev Sci Instrum. 2012 Jul;83(7):075112. doi: 10.1063/1.4737146.
In this paper, a compact, low jitter, nanosecond rise time, command triggered, high peak power, gas-switch pulse generator system is developed for high energy physics experiment. The main components of the system are a high voltage capacitor, the spark gap switch and R = 50 Ω load resistance built into a structure to obtain a fast high power pulse. The pulse drive unit, comprised of a vacuum planar triode and a stack of avalanche transistors, is command triggered by a single or multiple TTL (transistor-transistor logic) level pulses generated by a trigger pulse control unit implemented using the 555 timer circuit. The control unit also accepts user input TTL trigger signal. The vacuum planar triode in the pulse driving unit that close the first stage switches is applied to drive the spark gap reducing jitter. By adjusting the charge voltage of a high voltage capacitor charging power supply, the pulse amplitude varies from 5 kV to 10 kV, with a rise time of <3 ns and the maximum peak current up to 200 A (into 50 Ω). The jitter of the pulse generator system is less than 1 ns. The maximum pulse repetition rate is set at 10 Hz that limited only by the gas-switch and available capacitor recovery time.
本文为高能物理实验开发了一种紧凑、低抖动、纳秒级上升时间、指令触发、高峰值功率的气体开关脉冲发生器系统。该系统的主要部件是一个高压电容器、火花隙开关和内置在一个结构中的R = 50 Ω负载电阻，以获得快速的高功率脉冲。脉冲驱动单元由一个真空平面三极管和一堆雪崩晶体管组成，由一个使用555定时器电路实现的触发脉冲控制单元产生的单个或多个TTL（晶体管-晶体管逻辑）电平脉冲进行指令触发。该控制单元还接受用户输入的TTL触发信号。脉冲驱动单元中用于闭合第一级开关的真空平面三极管用于驱动火花隙，以减少抖动。通过调整高压电容器充电电源的充电电压，脉冲幅度在5 kV至10 kV之间变化，上升时间小于3 ns，最大峰值电流高达200 A（接入50 Ω负载）。脉冲发生器系统的抖动小于1 ns。最大脉冲重复频率设定为10 Hz，仅受气体开关和可用电容器恢复时间的限制。
