The influence of the shape of a cathode on the duration and amplitude of a supershort avalanches electron beam (SAEB) current pulses was experimentally studied. Three cathodes were used in experiments: tube, needle, and ball. Voltage pulses with a rise time of 200 ns were applied across an 8.5 mm gap filled with air and nitrogen at various pressures (12.5-100 kPa). It was found that at an air pressure of 12.5 kPa and a rise time of voltage pulses 200 ns, the largest amplitudes of SAEB current pulses (90 mA) were observed with the tubular cathode. The SAEB current pulse duration was τ0.5 ∼ 130 ps. Two pulses with different duration, amplitude and energy of electrons were observed with the needle cathode at same pressure. When using the ball cathode, the duration and amplitude of the beam current pulses were τ0.5 ∼ 250 ps and ∼ 4 mA, respectively.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 28 Nov 2019|
|Event||14th International Conference on Gas Discharge Plasmas and Their Applications, GDP 2019 - Tomsk, Russian Federation|
Duration: 15 Sep 2019 → 21 Sep 2019
ASJC Scopus subject areas
- Physics and Astronomy(all)