Effect of different elementary processes on the breakdown in low-pressure helium gas

Autor:	Peter Hartmann, Karoly Rozsa, L. Szalai, Gregor Bánó, Zoltan Donko
Rok vydání:	2000
Předmět:	Energetic neutral atom Chemistry chemistry.chemical_element Condensed Matter Physics Cathode Ion law.invention Impact ionization law Electric field Secondary emission Atomic physics Helium Voltage
Zdroj:	Plasma Sources Science and Technology. 9:183-190
ISSN:	1361-6595 0963-0252
DOI:	10.1088/0963-0252/9/2/311
Popis:	We investigated the breakdown in low-pressure helium gas both experimentally and by computer simulations. At low breakdown voltages (VBR 1000 V) the experimental and simulation results show a good agreement (differences are within 20%), while at higher voltages the simulations and experiments agree qualitatively. Our simulations indicate that several processes contribute to the particular shape of the Paschen curve in helium at low pressures. These processes are: (1) the dependence of the (ion-induced) secondary electron emission yield on the ion energy, (2) the appearance of ion impact ionization of the gas at high electric fields and (3) the secondary electron emission from the cathode due to fast neutral atoms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c58c9bdbbdc11acac8979cb9c9af11f7 https://doi.org/10.1088/0963-0252/9/2/311 Zobrazit plný text záznamu