NONLINEAR DENSITY EXPULSION AND ELECTRON HEATING IN THE NONADIABATIC REGIME, AND APPLICATION TO ION BERNSTEIN WAVE HEATING

Citation
Jr. Myra et Da. Dippolito, NONLINEAR DENSITY EXPULSION AND ELECTRON HEATING IN THE NONADIABATIC REGIME, AND APPLICATION TO ION BERNSTEIN WAVE HEATING, Physics of plasmas, 4(9), 1997, pp. 3187-3193
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Phsycs, Fluid & Plasmas
Journal title
ISSN journal
1070-664X
Volume
4
Issue
9
Year of publication
1997
Pages
3187 - 3193
Database
ISI
SICI code
1070-664X(1997)4:9<3187:NDEAEH>2.0.ZU;2-8
Abstract
In the limit where a strong parallel electric field has short parallel scale lengths, the parallel electron motion becomes nonadiabatic and highly nonlinear, and the usual ponderomotive treatment of the slow ti me scale behavior of electrons is invalid. Were, a new nonadiabatic mo del for describing the resulting heating and expulsion of electrons fr om regions of a strong electric field is developed. The model shows th at a typical electron is heated to a value characterized by the ''quiv er'' velocity in the applied field. A nonlinear density expulsion stil l occurs in this nonadiabatic strong rf field limit, but exhibits an a lgebraic dependence on the wave amplitude in contrast to the exponenti al dependence that occurs in conventional ponderomotive theory. Result s are applied to electrons in the edge plasma, near a high-power Ion B ernstein Wave heating antenna. (C) 1997 American Institute of Physics.