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Fast-ion transport during repetitive burst phenomena of Toroidal Alfv n Eigenmodes in the Large Helical Device
http://hdl.handle.net/10655/3086
http://hdl.handle.net/10655/3086822e319f-ca2c-4e87-ad42-d99d6927a31c
Item type | 研究報告書 / Research Paper(1) | |||||
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公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Fast-ion transport during repetitive burst phenomena of Toroidal Alfv n Eigenmodes in the Large Helical Device | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Nishiura, M.
× "Nishiura, M.× Isobe, M.× Yamamoto, S.× Tokuzawa, T.× Mutoh, T.× Funaba, H.× Saito, K.× Seki, T.× Murakami, S.× Osakabe, M.× Watanabe, F.× Toi, K.× Ido, T.× Nagasaka, T.× Fujioka, K.× Fujimoto, Y.× Nakatsuka, M.× Hirouchi, T.× Sasao, M.× LHD, experimental group" |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Alfv n instabilities induced fast-ion losses have been directly observed for the first time by a newly developed scintillator lost ion probe (SLIP) in the Large Helical Device (LHD). The SLIP can measure the pitch angle and gyro radius of escaped fast ions toward loss region. Neutral beam driven Alfv n Eigenmodes (AEs) are excited under the reactor relevant conditions: the ratio of fast ion (beam) speed v_b and Alfv n speed v_A is more than 0.3 ~ 4.0. The beta value for fast ions is considered roughly to be ~ 10% . Non-linear phenomena related to Alfv n instabilities are observed under such conditions. During repetitive Toroidal Alfv n Eigenmode (TAE) bursts, synchronized fast ion losses are observed by SLIP. From the orbit calculation the measured fast ion with pitch angle of 130 degrees and beam energy of 150 keV surely pass through the locations of TAE gaps. The orbit analysis found that the observed fast ions interact strongly with the excited TAEs. This result becomes the first experimental evidence of radial transport of fast ions predicted theoretically during TAE activities. In addition, from the correlation between stored energy degradation and fast-ion loss rate, it is found that fast-ion losses induced by TAE activities with low toroidal mode numbers categorize two phenomena without and with fast- ion loss enhancements, which indicate the fast-ion redistribution and loss." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 2008-10-01 |
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報告書番号 | ||||||
NIFS-911 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |