物理学报Issue(8)：085208-1-085208-7,7.DOI:10.7498/aps.63.085208
纳秒脉冲气体放电中逃逸电子束流的研究
Runaway electron b eams in nanosecond-pulse discharges
摘要
Abstract
Conventional discharge (Townsend and streamer mechanisms) theories are not able to well explain the phenomenon in nanosecond-pulse discharges. Recently, much attention has been paid to the runaway breakdown due to high-energy electrons in nanosecond-pulse discharges, and some experimental data confirm that high-energy runaway electron beam is an important characteristic parameter for nanosecond-pulse discharges. In this paper, two designed collectors are used for detecting runaway electron beams in nanosecond-pulse discharges. These collectors are used to measure the runaway electron beams in discharges driven by a nanosecond-pulse generator with a pulse width of 3-5 ns and a rise time of 1.2-1.6 ns. The measuring principle of both two collectors is similar to that of Faraday cup, where high-energy electrons are collected by a metal cone, and converted into an electric signal that can be recorded by an oscilloscope. Furthermore, optimal designs of collectors are conducted in order to improve the impedance matching characteristics and to obtain better recording data. Using the above two collectors, characteristics of runaway electron beams are investigated. Experimental results show that runaway electron beams can be effectively measured by the collectors, and the optimized collector has a shorter time resolution and higher amplitude of the runaway electron beam current. When the applied voltage is 80 kV, the electron beam current can be measured with an amplitude of 160 mA and a full width at half maximum of less than 1 ns. In addition, experimental results with pulse sequences prove that the collectors have excellent reliability, and both the transient response and the time resolution are stable.关键词
气体放电/纳秒脉冲/逃逸电子束流/收集器Key words
gas discharge/nanosecond pulse/runaway electron beam/collector引用本文复制引用
章程,马浩,邵涛,谢庆,杨文晋,严萍..纳秒脉冲气体放电中逃逸电子束流的研究[J].物理学报,2014,(8):085208-1-085208-7,7.基金项目
国家自然科学基金(批准号:51207154,51222701)、国家重点基础研究发展计划(批准号:2014CB239505)和新能源电力系统国家重点实验室开放基金(批准号：LAPS14009)资助的课题.@@@@ Project supported by the National Natural Science Foundation of China (Grant Nos.51207154,51222701), the National Basic Research Program of China (Grant No.2014CB239505), and State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, China (Grant No. LAPS14009) （批准号:51207154,51222701）
