Fast ion charge exchange spectroscopy adapted for tangential viewing geometry in LHD |
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| Authors: | Ito T Osakabe M Ida K Yoshinuma M Kobayashi M Goto M Murakami S Isobe M Kobayashi S Toi K Ogawa K Takeiri Y Okamura S |
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| Affiliation: | National Institute for Fusion Science, Toki 509-5292, Japan. |
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| Abstract: | A tangential Fast Ion Charge eXchange Spectroscopy is newly applied on a Large Helical Device (LHD) for co/countercirculating fast ions, which are produced by high energy tangential negative-ion based neutral beam injection. With this new observation geometry, both the tangential-neutral beam (NB) and a low-energy radial-NB based on positive ions can be utilized as probe beams of the measurement. We have successfully observed Doppler-shifted H-alpha lights due to the charge exchange process between the probing NB and circulating hydrogen ions of around 100 keV in LHD plasmas. |
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