期刊
TECHNICAL PHYSICS LETTERS
卷 36, 期 4, 页码 375-378出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1063785010040255
关键词
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Runaway electron beam parameters and current-voltage characteristics of discharge in helium, hydrogen, and nitrogen at pressures in the range of several Torr to several hundred Torr have been studied. It is found that the maximum amplitudes of supershort avalanche electron beams (SAEBs) with a pulse full width at half maximum (FWHM) of similar to 100 ps are achieved in helium, hydrogen, and nitrogen at a pressure of similar to 60, similar to 30, and similar to 10 Torr, respectively. It is shown that, as the gas pressure is increased in the indicated range, the breakdown voltage of the gas-filled gap decreases, which leads to a decrease in the SAEB current amplitude. At pressures of helium within 20-60 Torr, hydrogen within 10-30 Torr, and nitrogen within 3-10 Torr, the regime of the runaway electron beam generation changes and, by varying the pressure in the gas-filled diode in the indicated intervals, it is possible to smoothly control the current pulse duration (FWHM) from similar to 100 to similar to 500 ps, while the beam current amplitude increases by a factor of 1.5-3.
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