Study of negative ion transport phenomena in a plasma source
- Departement de Recherches sur la Fusion Controlee C. E., Cadarache, 13108 St-Paul-lez-Durance Cedex (France)
NIETZSCHE (Negative Ions Extraction and Transport ZSimulation Code for HydrogEn species) is a negative ion (NI) transport code developed at Cadarache. This code calculates NI trajectories using a 3D Monte-Carlo technique, taking into account the main destruction processes, as well as elastic collisions (H{sup {minus}}/H{sup +}) and charge exchanges (H{sup {minus}}/H{sup 0}). It determines the extraction probability of a NI created at a given position. According to the simulations, we have seen that in the case of volume production, only NI produced close to the plasma grid (PG) can be extracted. Concerning the surface production, we have studied how NI produced on the PG and accelerated by the plasma sheath backward into the source could be extracted. We demonstrate that elastic collisions and charge exchanges play an important role, which in some conditions dominates the magnetic filter effect, which acts as a magnetic mirror. NI transport in various conditions will be discussed: volume/surface production, high/low plasmas density, tent filter/transverse filter. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 451119
- Report Number(s):
- CONF-9510304-; ISSN 0094-243X; TRN: 97:005631
- Journal Information:
- AIP Conference Proceedings, Vol. 380, Issue 1; Conference: Joint meeting of the 7. international symposium on the production and neutralization of negative ions and beams and the 6. European workshop on the production and application of light negative ions, Upton, NY (United States), 23-27 Oct 1995; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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