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

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Osakabe, M. and Murakami, S. and Yoshinuma, M. and Ida, K. and Whiteford, A.D. and Goto, M. and Kato, D. and 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. ISSN 0034-6748 (http://dx.doi.org/10.1063/1.2968695)

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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.

  • Item type:Article
    ID code:19407
    Dates:
    Date
    Event
    28 October 2008
    Published
    Notes:Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
    Subjects:Science > Physics > Optics. Light
    Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:18 May 2010 15:30
    Last modified:11 Nov 2024 09:22
    URI:https://strathprints.strath.ac.uk/id/eprint/19407
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