Field Emission Dark Current of Technical Metallic Electrodes

Details Field Emission Dark Current of Technical Metallic Electrodes Field Emission Dark Current of Technical Metallic Electrodes

2006-10-12

arxiv.org/abs/physics/0610090v3

Nucl.Instrum.Meth.A574:7-16,2007

Physics

Accelerator Physics

22 pages, 6 tables, 10 figures Vs 2 : graphics more readable, enhanced content Vs 3 : typo corrected

Scientific paper

10.1016/j.nima.2007.01.087

In the framework of the Low Emittance Gun (LEG) project, high gradient acceleration of a low emittance electron beam will be necessary. In order to achieve this acceleration a -500 kV, 250 ns FWHM, pulse will be applied in between two electrodes. Those electrodes should sustain the pulsed field without arcing, must not outgass and must not emit electrons. Ion back bombardment, and dark current will be damageable to the electron source as well as for the low emittance beam. Electrodes of commercially available OFE copper, aluminium, stainless steel, titanium and molybdenum were tested following different procedures including plasma glow discharge cleaning.

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