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タイトルSimulation of photo-detached electrons in negative ion plasmas
作成者Naitou, H.
Sakurai, Y.
Tauchi, Y.
Fukumasa, O.
Yagi, M.
Yamagata, Y.
Uchino, K.
Muraoka, K
作成者ヨミフクマサ, オサム
作成者別表記福政, 修
Fukumasa, Osamu
作成者所属山口大学大学院理工学研究科(工学)
内容記述(抄録等)The evolution of laser photo-detached and background electrons in a glow discharge plasma containing negative ions was followed using a two-dimensional particle-in-cell simulation code. Emphasis was placed on the short timescale (20 ns after photo-detachment for the parameters of a typical glow discharge plasma) behaviour because this is the timescale of the recently developed laser Thomson scattering technique combined with photo-detachment. A plasma consisting of background electrons, positive argon ions (Ar^+) and negative oxygen ions (O^-) was treated. The loss of photo-detached electrons from the photo-detachment region quickly forms a potential structure in a short time of 2 ns. The potential traps the remaining photo-detached electrons. The profile of the trapped photo-detached electrons is hollow. The loss of the photo-detached electrons from the photo-detachment region is compensated by the bulk electrons coming from the ambient plasma; the sum of the photo-detached and bulk electron densities in the photo-detachment region remains unchanged for 20 ns because ions are almost immobile in this timescale. This analysis has also revealed the fractions of the photo-detached electrons remaining in the photo-detachment region during the 20 ns to be relatively insensitive to a change in laser beam size and very sensitive to the relative densities of negative ions against background electrons, and to the shape of the velocity distribution function at different angles with respect to the laser beam axis.
本文言語eng
資料タイプtext
出版者Institute of Physics
NII資料タイプ学術雑誌論文
査読の有無査読あり
ISSN0741-3335
NCIDAA10643410
掲載誌名Plasma physics and controlled fusion
46
8
開始ページ1217
終了ページ1230
発行日2004
DOIinfo:doi/10.1088/0741-3335/46/8/004
関連情報URL(IsPartOf)http://www.iop.org/EJ/journal/PPCF
著者版/出版社版その他
リポジトリID2008010061
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2008010061