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Titolo:
Simulation of pulsed high-frequency breakdown in hydrogen
Autore:
Lacoste, A; Alves, LL; Ferreira, CM; Gousset, G;
Indirizzi:
Electrostat & Mat Dielect Lab, Grenoble 9, France Electrostat & Mat Dielect Lab Grenoble France 9 Lab, Grenoble 9, France Inst Super Tecn, Ctr Fis Plasmas, P-1049001 Lisbon, Portugal Inst Super Tecn Lisbon Portugal P-1049001 as, P-1049001 Lisbon, Portugal Univ Paris Sud, Phys Gaz & Plasmas Lab, F-91405 Orsay, France Univ Paris Sud Orsay France F-91405 & Plasmas Lab, F-91405 Orsay, France
Titolo Testata:
JOURNAL OF APPLIED PHYSICS
fascicolo: 6, volume: 88, anno: 2000,
pagine: 3170 - 3181
SICI:
0021-8979(20000915)88:6<3170:SOPHBI>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONTE-CARLO SIMULATION; DISSOCIATIVE ATTACHMENT; ELECTRICAL BREAKDOWN; H-2; EXCITATION; COLLISIONS; ELECTRONS; DISCHARGES; TRANSPORT; NITROGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Lacoste, A Electrostat & Mat Dielect Lab, 25 Rue Martyrs, Grenoble 9, France Electrostat & Mat Dielect Lab 25 Rue Martyrs Grenoble France 9
Citazione:
A. Lacoste et al., "Simulation of pulsed high-frequency breakdown in hydrogen", J APPL PHYS, 88(6), 2000, pp. 3170-3181

Abstract

We present a simulation of the breakdown stage of high-power, short-pulse high-frequency discharges in hydrogen, produced when an electric field of the form E(t)=E-max(IW)(1-e(-t/tau))sin(omega t) is applied to a cylindricalresonant cavity. Typical discharge operating conditions considered are applied powers 1-15 kW, gas pressures 0.1-20 Torr, cavity diameter of 25.71 cm, tube radius of 0.8 cm, field frequency omega/2 pi=1.12 GHz, pulse width t(P)=10 mu s, and rising times tau of a few microseconds. Under these conditions, discharge breakdown occurs before the electric field reaches its maximum amplitude E-max(IW), this situation corresponding to the so-called increasing wave (IW) regime. The simulation is based on a Monte Carlo model to calculate the breakdown times, t(b), and fields, E-b, for different field rising slopes E-max(IW)/tau similar or equal to 10(-1)-10(3) V cm(-1) ns(-1). The results obtained show that a breakdown criterion based on the electron energy balance (epsilon(gain)=epsilon(loss), where epsilon(gain) and epsilon(loss) are, respectively, the mean electron energy gain and loss) yieldsexcellent agreement between calculated and measured values of t(b) and E-b, while the classical particle rate balance criterion (nu(gain)=nu(loss), where nu(ion) and nu(loss) are, respectively, the mean electron production and loss frequencies) is satisfied only at pressures below 0.5 Torr. It is further shown that: (i) the IW limit for long breakdown times (t(b)similar or equal to tau -->infinity) corresponds to the continuous wave regime; and (ii) there is an equivalence between pulsed excitation, with pulse width t(P), and IW regimes, for short breakdown times such that t(b)=t(P)<<tau. (C)2000 American Institute of Physics. [S0021-8979(00)05918-1].

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Documento generato il 10/07/20 alle ore 03:16:20