Fast ion charge exchange spectroscopy measurement using a radially injected neutral beam on the large helical device

M. Osakabe, S. Murakami, M. Yoshinuma, K. Ida, A.D. Whiteford, M. Goto, D. Kato, T. Kato

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

An experimental technique to investigate fast ion confinement based on charge exchange spectroscopy of Hα-light was applied to evaluate the confinement property of perpendicular fast ions in large helical device (LHD). Sensitivities of the Hα spectra to the pitch angles of injected neutral beams (NBs) and these to the angle between the sight line of the measurement and NB injection path are examined. The energy dependence of the charge exchange cross section significantly affects the observed spectra since the driving NB is injected perpendicular to the magnetic field lines in the geometry of LHD. The measured spectra are compared to the spectra of GNET simulation results and the simulated spectra agreed well with the experimental measurement when we take into account the contribution of halo neutrals. Although it is difficult to obtain the fast ion distribution functions directly, this technique provides useful experimental data in benchmarking simulation codes.
LanguageEnglish
Pages10E519-10E519
JournalReview of Scientific Instruments
Volume79
Issue number10
DOIs
Publication statusPublished - 28 Oct 2008

Fingerprint

ion charge
neutral beams
charge exchange
Ion exchange
Spectroscopy
Ions
spectroscopy
Benchmarking
Distribution functions
beam injection
ion distribution
Magnetic fields
pitch (inclination)
Geometry
line of sight
halos
ions
simulation
distribution functions
sensitivity

Keywords

  • charge exchange
  • plasma beam injection heating
  • plasma confinement
  • plasma diagnostics

Cite this

Osakabe, M., Murakami, S., Yoshinuma, M., Ida, K., Whiteford, A. D., Goto, M., ... Kato, T. (2008). Fast ion charge exchange spectroscopy measurement using a radially injected neutral beam on the large helical device. Review of Scientific Instruments, 79(10), 10E519-10E519. https://doi.org/10.1063/1.2968695
Osakabe, M. ; Murakami, S. ; Yoshinuma, M. ; Ida, K. ; Whiteford, A.D. ; Goto, M. ; Kato, D. ; Kato, T. / Fast ion charge exchange spectroscopy measurement using a radially injected neutral beam on the large helical device. In: Review of Scientific Instruments. 2008 ; Vol. 79, No. 10. pp. 10E519-10E519.
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Osakabe, M, Murakami, S, Yoshinuma, M, Ida, K, Whiteford, AD, Goto, M, Kato, D & Kato, T 2008, 'Fast ion charge exchange spectroscopy measurement using a radially injected neutral beam on the large helical device' Review of Scientific Instruments, vol. 79, no. 10, pp. 10E519-10E519. https://doi.org/10.1063/1.2968695

Fast ion charge exchange spectroscopy measurement using a radially injected neutral beam on the large helical device. / Osakabe, M.; Murakami, S.; Yoshinuma, M.; Ida, K.; Whiteford, A.D.; Goto, M.; Kato, D.; Kato, T.

In: Review of Scientific Instruments, Vol. 79, No. 10, 28.10.2008, p. 10E519-10E519.

Research output: Contribution to journalArticle

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AU - Goto, M.

AU - Kato, D.

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