Volume 74, Number 3, May 2006
|Page(s)||431 - 437|
|Section||Physics of gases, plasmas and electric discharges|
|Published online||22 March 2006|
Why does a low-pressure wire-discharge exist self-sustained?
SOPRA SA - 26 rue Pierre Joigneaux, 92270 Bois-Colombes, France
2 LPGP, Université Paris XI - 91405 Orsay, France
3 IHCE - 4 ave. Akademicheski, 650055, Tomsk, Russia
Corresponding author: email@example.com
Accepted: 28 February 2006
Numerical study of a self-sustained low-pressure (6.8 or 50) wire discharge in helium is reported. The current-independent voltage drop across the cathode sheath is found to be of ~250. The other part of the discharge voltage is essentially applied across the anode sheath. It drains electrons from the quasi-neutral plasma and thus presents a necessary condition for discharge maintenance. Two major groups of electrons have been distinguished: the fast electrons of ~(24–250), as well as a very small fraction of hot (run-away) electrons with the energy close to the discharge voltage, are responsible for gas ionization throughout negative glow while the thermalized electrons of ~1's eV are easily captured by the anode and so removed from the discharge.
PACS: 52.80.Hc – Glow; corona / 52.65.Pp – Monte Carlo methods / 52.65.Rr – Particle-in-cell method
© EDP Sciences, 2006
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