等离子体阴极电子枪的实验研究

填充等离子体高功率微波器件具有独特的性能.然而等离子体正离子对电子枪的轰击通常会破坏材料阴极表面并降低其电子发射能力.解决此问题的一种新方案是采用等离子体阴极电子枪.本文设计制作了等离子体阴极电子枪,采用氦气馈气系统和脉冲调制器进行实验研究,得到电子枪放电电流与气体压强、调制器电压等的关系.实验表明,等离子体阴极可取代材料阴极作为大电流、长脉冲电子注源.

Experimental Study of the Plasma Cathode Electron Gun

The high-power microwave devices filled with plasma have unique properties.One of the major problems associated with plasma-filled microwave sources is that ions from the plasma drift toward the gun regions of the tube.This bombardment is particularly dangerous for the gun,where high-energy ion impacts can damage the cathode surface and degrade its electron emission capabilities.One of the techniques investigated to mitigate this issue is to replace the material cathode with plasma cathode.A unique plasma cathode electron gun are investigated experimentally.The PCE-gun has been operated at pulser voltage up to 8kV,discharge current up to 140A,and pulse lengths up to 60 μs.