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Titolo: Simulation of pulsed highfrequency 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, P1049001 Lisbon, Portugal Inst Super Tecn Lisbon Portugal P1049001 as, P1049001 Lisbon, Portugal Univ Paris Sud, Phys Gaz & Plasmas Lab, F91405 Orsay, France Univ Paris Sud Orsay France F91405 & Plasmas Lab, F91405 Orsay, France
 Titolo Testata:
 JOURNAL OF APPLIED PHYSICS
fascicolo: 6,
volume: 88,
anno: 2000,
pagine: 3170  3181
 SICI:
 00218979(20000915)88:6<3170:SOPHBI>2.0.ZU;2C
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 MONTECARLO SIMULATION; DISSOCIATIVE ATTACHMENT; ELECTRICAL BREAKDOWN; H2; 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 highfrequency breakdown in hydrogen", J APPL PHYS, 88(6), 2000, pp. 31703181
Abstract
We present a simulation of the breakdown stage of highpower, shortpulse highfrequency discharges in hydrogen, produced when an electric field of the form E(t)=Emax(IW)(1e(t/tau))sin(omega t) is applied to a cylindricalresonant cavity. Typical discharge operating conditions considered are applied powers 115 kW, gas pressures 0.120 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 Emax(IW), this situation corresponding to the socalled increasing wave (IW) regime. The simulation is based on a Monte Carlo model to calculate the breakdown times, t(b), and fields, Eb, for different field rising slopes Emax(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 Eb, 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. [S00218979(00)059181].
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Documento generato il 10/07/20 alle ore 03:16:20