Open AccessThe influence of particle beams on the criterion of Bohm sheath
Author(s) -
Gu Yun-Peng,
Tingli Ma
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.1196
Subject(s) - collision , ion , electron , ionization , directive , atomic physics , argon , charge (physics) , physics , particle (ecology) , charge exchange , materials science , nuclear physics , computer science , quantum mechanics , oceanography , computer security , programming language , geology
A twofluid model has been used to study the influence of the existence of the directive ions and directive electrons on the Bohm criterion of sheath. The main collisions included in this study consist of the charge exchange collision, ionization collision and total energy loss collision. The operated gas is argon with a gas pressure 101325 Pa. Numerical calculation results are obtained, which show that the minimal speed at which drift ions enter into the sheath for directive ions is decreased. This is also valid for the charge exchange collision. The directive electrons make this speed increase, but the ionization collision related to directive electrons makes the speed decrease obviously.