Negative hydrogen ion yields at plasma grid surface in a negative hydrogen ion source

Journal Article · Wed Apr 08 04:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4916419· OSTI ID:22391401

Kenmotsu, T. ^[1]; Sasao, M. ^[2]

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1. School of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto 610-0321 Japan (Japan)
2. Office of R and D Promotion, Doshisha University, Kamigyoku, Kyoto 602-8580 Japan (Japan)

Negative hydrogen (H{sup −}) ion yield from the plasma grid due to incident hydrogen ions and neutrals has been evaluated with the surface collision cascade model, ACAT (Atomic Collision in Amorphous Target) coupled to a negative surface ionization models. Dependence of negative ion fractions upon the velocity component normal to the surface largely affect the calculation results of the final energy and angular distributions of the H{sup −} ions. The influence is particularly large for H{sup −} ions desorbed from the surface due to less than several eV hydrogen particle implact. The present calculation predicts that H{sup −} ion yield can be maximized by setting the incident angle of hydrogen ions and neutrals to be 65 degree. The Cs thickness on the plasma grid should also affect the yields and mean energies of surface produced H{sup −} ions by back scattering and ion induced desorption processes.

• OSTI ID: 22391401
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1655; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
BACKSCATTERING
CESIUM
DESORPTION
EV RANGE
HYDROGEN IONS 1 MINUS
PLASMA
SURFACE IONIZATION
SURFACES
YIELDS