Experimental study of Diamond Like Carbon (DLC) coated electrodes for pulsed High Gradient electron gun

Author

Paraliev, Martin ; Gough, Christopher ; Ivkovic, Sladjana ; Le Pimpec, Frederic

Author_Institution

Paul Scherrer Inst., Villigen, Switzerland

fYear

2010

fDate

23-27 May 2010

Firstpage

655

Lastpage

658

Abstract

For the SwissFEL Free Electron Laser project at the Paul Scherrer Institute, a pulsed High Gradient (HG) electron gun was used to study low emittance electron sources. Different metals and surface treatments for the cathode and anode were studied for their HG suitability. Diamond Like Carbon (DLC) coatings are found to perform exceptionally well for vacuum gap insulation. A set of DLC coated electrodes with different coating parameters were tested for both vacuum breakdown and photo electron emission. Surface electric fields over 250 MV/m (350-400 kV, pulsed) were achieved without breakdown. From the same surface, it was possible to photo-emit an electron beam at gradients up to 150 MV/m. The test setup and the experimental results are presented.

Keywords

anodes; cathodes; diamond-like carbon; electrochemical electrodes; electron guns; insulating coatings; photoemission; pulsed power technology; surface treatment; vacuum breakdown; vacuum insulation; C; anode; cathode; diamond like carbon coated electrodes; low emittance electron sources; photoelectron emission; pulsed high gradient electron gun; surface electric fields; surface treatments; vacuum breakdown; vacuum gap insulation; voltage 350 kV to 400 kV; Cathodes; Coatings; Electric breakdown; Steel; Surface treatment; DLC; cathode; high gradient; pulsed electron gun;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Modulator and High Voltage Conference (IPMHVC), 2010 IEEE International

Conference_Location

Atlanta, GA

Print_ISBN

978-1-4244-7131-7

Type

conf

DOI

10.1109/IPMHVC.2010.5958444

Filename

5958444