Title :
Relativistic electron beams from cathodes at 1 GV/m gradient
Author :
Srinivasan-Rao, T. ; Smedley, J. ; Schill, J.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
fDate :
6/20/1905 12:00:00 AM
Abstract :
A high voltage pulser capable of delivering up to 1 MV with a duration of ~1 ns and rise and fall times of ~0.15 ns has been constructed and tested. Copper and stainless steel cathodes have been tested to withstand 1 GV/m gradient. Under background pressures of 10 -7 Torr, the dark current is below the detection limit of our system at 1 GV/m gradient and hence would not contribute significantly to the photocurrent. Copper cathode and stainless steel anode have been shown to withstand applied fields of 1.7 GV/m without experiencing high voltage breakdown. Dark current measurements and Fowler-Nordheim plot for fields exceeding 1 GV/m indicate that surface fields experienced by these electrodes could be as high as 40 GV/m
Keywords :
copper; dark conductivity; electron sources; photocathodes; relativistic electron beams; space charge; stainless steel; work function; Fowler-Nordheim plot; background pressures; copper cathode; dark current; high voltage breakdown; high voltage pulser; photocurrent; relativistic electron beams; stainless steel cathodes; Anodes; Cathodes; Copper; Dark current; Dielectric breakdown; Electron beams; Photoconductivity; Steel; Testing; Voltage;
Conference_Titel :
High-Power Particle Beams, 1998. BEAMS '98. Proceedings of the 12th International Conference on
Conference_Location :
Haifa
Print_ISBN :
0-7803-4287-9
DOI :
10.1109/BEAMS.1998.822403
