Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenmodes in the Large Helical Device

K. Ogawa; M. Isobe; K. Toi; F. Watanabe; D. A. Spong; A. Shimizu; M. Osakabe; D. S. Darrow; S. Ohdachi; S. Sakakibara; LHD Experiment Group

doi:10.1088/1009-0630/14/4/01

Plasma Science and Technology > 2012 > 14(4): 269-272. > DOI: 10.1088/1009-0630/14/4/01

K. Ogawa, M. Isobe, K. Toi, F. Watanabe, D. A. Spong, A. Shimizu, M. Osakabe, D. S. Darrow, S. Ohdachi, S. Sakakibara, LHD Experiment Group. Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenmodes in the Large Helical Device[J]. Plasma Science and Technology, 2012, 14(4): 269-272. DOI: 10.1088/1009-0630/14/4/01

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Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenmodes in the Large Helical Device

1 National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Japan 2 Department of Energy Science and Engineering, Nagoya University, Nagoya, Japan 3 Graduate School of Energy Science, Kyoto University, Kyoto, Japan 4 Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA 5 Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, USA

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Received Date: December 09, 2010

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Abstract

Beam-ion losses induced by fast-ion-driven toroidal Alfven eigenmodes (TAE) were measured with a scintillator-based lost fast-ion probe (SLIP) in the large helical device (LHD). The SLIP gave simultaneously the energy E and the pitch angle χ=arccos(v///v) distribution of the lost fast ions. The loss fluxes were investigated for three typical magnetic configurations of Rax_vac=3.60 m, 3.75 m, and 3.90 m, where Rax_vac is the magnetic axis position of the vacuum field. Dominant losses induced by TAEs in these three configurations were observed in the E/χ regions of 50–190 keV/40°, 40–170 keV/25°, and 30–190 keV/30°, respectively. Lost-ion fluxes induced by TAEs depend clearly on the amplitude of TAE magnetic fluctuations, Rax_vac and the toroidal field strength Bt. The increment of the loss fluxes has the dependence of (bTAE/Bt)s. The power s increases from s=1 to 3 with the increase of the magnetic axis position in finite beta plasmas.

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