A high current density plasma cathode electron gun

Wenjie Fu; Yang Yan; Wenxu Li; Xiaoyun Li; Jianqiang Wu
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p071502
Academic Journal
The design, performance, and characteristics of a plasma cathode electron gun are presented. The plasma cathode is based on a hollow cathode direct current discharge, and the electron beam is accelerated by pulse voltage. By discharging at high gas pressure and operating at low gas pressure, both the maximum accelerating voltage and maximum emitting current could be increased. Utilizing argon, with the accelerating voltage up to 9 kV and gas pressure down to 52 mPa, the gun is able to generate an electron beam of about 4.7 A, and the corresponding emitting current density is about 600 A/cm2.


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