The paper presents experimental and numerical research results on the operation of gas diode at low pressure. A high dispersion in the runaway electron beam current (from 20 to 100 A) with respect to the average one (∼50 A) is observed for a tubular cathode with a working edge radius of 30 μm, nitrogen pressure of 30 Torr, and an interelectrode gap of 6 mm. Numerical simulation data show that the low beam current (∼20 A) is due to the early electron emission from the cathode (at the stage of low-voltage prepulse), in which the runaway electron beam is formed from the boundary of plasma layer developing early in the breakdown. The high beam current (∼100 A) is due to the delayed electron emission from the cathode, which increases the diode voltage and the runaway electron beam current. In the latter case, the runaway electron beam is formed directly at the cathode.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 4 May 2017|
|Event||5th International Congress on Energy Fluxes and Radiation Effects 2016, EFRE 2016 - Tomsk, Russian Federation|
Duration: 2 Oct 2016 → 7 Oct 2016
ASJC Scopus subject areas
- Physics and Astronomy(all)