Table top, pulsed, relativistic electron gun with GV/m gradient
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
We present the design and performance characteristics of a compact, high voltage pulser with 150 ps rise time, 0.2 to 2 ns adjustable flat top and up to 1 MV amplitude on a 80 Ohm load or up to 0.5 MV on a 20 Ohm load, at 1 Hz repetition rate. Combination of a laser triggered SF{sub 6} and a liquid gap is used to form the fast rising pulse and maintain a low jitter between the laser, external trigger, and the high voltage pulsed output. The dark current and breakdown studies with this pulse applied between the electrodes of a diode indicate that fields up to 1 GV/m could be supported by stainless steel and copper cathodes without breaking down. The dark current from a conditioned cathode in a background pressure of 10{sup {minus}7}Torr is below the detection limit of 0.5 mA of our system. Photoemission studies had been conducted with 300 kV applied between copper cathode and stainless steel anode seperated by 2 mm. KrF laser of 5 eV photon energy and 20 ns FWHM was used to irradiate the cathode. In these preliminary measurements, 3 nC charge and corresponding quantum efficiency of 3.5{times}10{sup {minus}4} have been obtained. Future plans include increasing the gradient to GV/m range, decreasing the laser pulse duration to ps and subps range and increasing the electron energy to a few MeV. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 580191
- Report Number(s):
- CONF-9610281-; ISSN 0094-243X; TRN: 98:004051
- Journal Information:
- AIP Conference Proceedings, Vol. 398, Issue 1; Conference: 7. advanced accelerator concepts workshop, Lake Tahoe, NV (United States), Oct 1996; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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