Simulation of photo-detached electrons in negative ion plasmas

Simulation of photo-detached electrons in negative ion plasmas

Creators Naitou H.

Creators Sakurai Y.

Creators Tauchi Y.

Creators Fukumasa O.

Creators Yagi M.

Creators Yamagata Y.

Creators Uchino K.

Creators Muraoka K

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

[ISSN]0741-3335

[NCID]AA10643410

https://doi.org/10.1088/0741-3335/46/8/004

[isPartOf] [URI]http://www.iop.org/EJ/journal/PPCF