Title :
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
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;
Conference_Titel :
Power Modulator and High Voltage Conference (IPMHVC), 2010 IEEE International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-7131-7
DOI :
10.1109/IPMHVC.2010.5958444
