Extraction physics in volume H- -ion sources

M. Bacal, Akiyoshi Hatayama, T. Matsumiya, M. Hamabe, T. Kuroda, Y. Oka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Recent hydrogen negative-ion sources (JT60, large helical device (LHD)) operate with a magnetic filter field extending up to the plasma electrode and extraction opening. As shown earlier such a magnetic field has a strong effect upon the value of the extracted negative ion and electron current. Measurements of the negative ion and electron density were performed in the ion source, both in the magnetic-field-free region and in the region near the plasma electrode. This work presents the experimental value of the ratio between the extracted negative ion and electron current in different sources. It is shown that the measured current ratio is considerably higher than what can be predicted from a simple thermal flux model based on the density ratio in the bulk of the plasma. We also calculated the ratio between the extracted negative ion and electron currents based on the measured ratio between the negative ion and electron density near the extraction opening using the different theoretical models for electron flux: (1) thermal flux model (I- Ie) thermal and (2) collisional flux model (I- Ie) coll. The comparisons show that (I- Ie) thermal is considerably smaller, while (I- Ie) coll tends to be larger than the experimental value. The underlying physics of this discrepancy is discussed.

Original languageEnglish
Article number03A502
JournalReview of Scientific Instruments
Volume77
Issue number3
DOIs
Publication statusPublished - 2006 Mar

Fingerprint

Ion sources
negative ions
ion sources
Negative ions
Physics
Hydrogen
physics
plasma electrodes
ion currents
Fluxes
Electrons
Plasmas
Carrier concentration
Magnetic filters
Magnetic fields
Electrodes
electrons
electron flux
hydrogen ions
magnetic fields

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

Cite this

Bacal, M., Hatayama, A., Matsumiya, T., Hamabe, M., Kuroda, T., & Oka, Y. (2006). Extraction physics in volume H- -ion sources. Review of Scientific Instruments, 77(3), [03A502]. https://doi.org/10.1063/1.2149367

Extraction physics in volume H- -ion sources. / Bacal, M.; Hatayama, Akiyoshi; Matsumiya, T.; Hamabe, M.; Kuroda, T.; Oka, Y.

In: Review of Scientific Instruments, Vol. 77, No. 3, 03A502, 03.2006.

Research output: Contribution to journalArticle

Bacal, M, Hatayama, A, Matsumiya, T, Hamabe, M, Kuroda, T & Oka, Y 2006, 'Extraction physics in volume H- -ion sources', Review of Scientific Instruments, vol. 77, no. 3, 03A502. https://doi.org/10.1063/1.2149367
Bacal M, Hatayama A, Matsumiya T, Hamabe M, Kuroda T, Oka Y. Extraction physics in volume H- -ion sources. Review of Scientific Instruments. 2006 Mar;77(3). 03A502. https://doi.org/10.1063/1.2149367
Bacal, M. ; Hatayama, Akiyoshi ; Matsumiya, T. ; Hamabe, M. ; Kuroda, T. ; Oka, Y. / Extraction physics in volume H- -ion sources. In: Review of Scientific Instruments. 2006 ; Vol. 77, No. 3.
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