Estimation of the cusp loss width in negative-ion sources

A. Fukano, T. Mizuno, Akiyoshi Hatayama, M. Ogasawara

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

To estimate loss width in the cusp magnetic field in multicusp negative-ion sources, diffusion of plasma across magnetic field is investigated analytically. The transport process of plasma depends on various plasma conditions. Diffusion coefficients are classified by degrees of plasma ionization. In weakly ionized plasma, where a case of electron-neutral particle collision is dominant as compared with electron-ion collision, there is a possibility that ambipolar diffusion or electron short circuit occurs in plasma. This strongly depends on the conditions of the plasma, the system length, and the wall material. On the other hand, in fully ionized plasma, only ambipolar diffusion occurs automatically due to momentum conservation of electron and ion. In not fully but strongly ionized plasma, plasma diffusion depends on electron-neutral particle collision, ion-neutral particle collision, and electron-ion collision. Being based on the classification of the diffusion coefficients, we derive expressions of loss widths for various plasma conditions.

Original languageEnglish
Article number03A524
JournalReview of Scientific Instruments
Volume77
Issue number3
DOIs
Publication statusPublished - 2006 Mar

Fingerprint

Ion sources
cusps
negative ions
ion sources
Negative ions
Plasmas
particle collisions
neutral particles
Electrons
ambipolar diffusion
electrons
Ions
ions
diffusion coefficient
plasma diffusion
Magnetic fields
collisions
short circuits
magnetic fields
conservation

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

Cite this

Fukano, A., Mizuno, T., Hatayama, A., & Ogasawara, M. (2006). Estimation of the cusp loss width in negative-ion sources. Review of Scientific Instruments, 77(3), [03A524]. https://doi.org/10.1063/1.2169658

Estimation of the cusp loss width in negative-ion sources. / Fukano, A.; Mizuno, T.; Hatayama, Akiyoshi; Ogasawara, M.

In: Review of Scientific Instruments, Vol. 77, No. 3, 03A524, 03.2006.

Research output: Contribution to journalArticle

Fukano, A, Mizuno, T, Hatayama, A & Ogasawara, M 2006, 'Estimation of the cusp loss width in negative-ion sources', Review of Scientific Instruments, vol. 77, no. 3, 03A524. https://doi.org/10.1063/1.2169658
Fukano, A. ; Mizuno, T. ; Hatayama, Akiyoshi ; Ogasawara, M. / Estimation of the cusp loss width in negative-ion sources. In: Review of Scientific Instruments. 2006 ; Vol. 77, No. 3.
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