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The requirements on beam current and pulse widthfordielectric wall accelerator(DWA)testneed to design a new type of high current pulsed electron gun.Thermionic sources were problematic becauseof the close proximity to plastic components ofthe DWAthat might deform or outgas when heated.Photocathodes wouldmake the present laser systemmore complicated due to the use of photoconductiveswitching.Plasma cathodes,in which an electric field is usedto extract electrons from plasma,avoid the mentioned problems andare capable toproduce high current-short pulse electron beam[1].
The requirements on beam current and pulse widthfordielectricwall accelerator (DWA) testneed to design a new type of high current pulsed electron gun. Hermionic sources were problematic becauseof the close proximity to plastic components of the DWAthat might deform or outgas when heated. Photocathodes wouldmake the present laser systemmore complicated to to use of photoconductiveswitching.Plasma cathodes, in which an electric field is usedto extract electrons from plasma, avoid the mentioned problems andare capable toproduce high current-short pulse electron beam [1].