Ultrashort electron beams generated on the flat part of a voltage pulse in nitrogen and helium |
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Authors: | E Kh Baksht V F Tarasenko M I Lomaev D V Rybka |
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Affiliation: | (1) Institute of High-Current Electronics, Siberian Division, Russian Academy of Sciences, Tomsk, Russia |
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Abstract: | In the case of voltage pulses with a small amplitude, an ultrashort avalanche electron beam (UAEB) in a diode filled with nitrogen or helium is generated on a flat part of the pulse. UAEBs obtained at a voltage of 25 kV have a full width at half maximum (FWHM) of about 200 ps and are delayed relative to the voltage pulse front by a time reaching tens of nanoseconds. Waveforms of the electron beam current pulse with several peaks of subnanosecond duration have been observed. At elevated pressures in a gas-filled diode, the voltage across the gap decreases by 10–20% during the electron beam generation. |
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