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

被引：2
|
作者：
Ogawa, K. [1 ]
Isobe, M. [2 ]
Toi, K. [1 ,2 ]
Watanabe, F. [3 ]
Spong, D. A. [4 ]
Shimizu, A. [2 ]
Osakabe, M. [2 ]
Darrow, D. S. [5 ]
Ohdachi, S. [2 ]
Sakakibara, S. [2 ]
机构：
[1] Nagoya Univ, Dept Energy Sci & Engn, Nagoya, Aichi 4648601, Japan
[2] Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan
[3] Kyoto Univ, Grad Sch Energy Sci, Kyoto, Japan
[4] Oak Ridge Natl Lab, Oak Ridge, TN USA
[5] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
来源：
PLASMA SCIENCE & TECHNOLOGY | 2012年 / 14卷 / 04期
关键词：
toroidal Alfven eigenmode; fast ion loss; the large helical device;
D O I：
10.1088/1009-0630/14/4/01
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
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 chi=arccos(v(parallel to)/v) distribution of the lost fast ions. The loss fluxes were investigated for three typical magnetic configurations of R-ax_vac=3.60 m, 3.75 m, and 3.90 m, where R-ax_vac is the magnetic axis position of the vacuum field. Dominant losses induced by TAEs in these three configurations were observed in the E/chi regions of 50 similar to 190 keV/40 degrees, 40 similar to 170 keV/25 degrees, and 30 similar to 190 keV/30 degrees, respectively. Lost-ion fluxes induced by TAEs depend clearly on the amplitude of TAE magnetic fluctuations, R-ax_vac and the toroidal field strength B-t. The increment of the loss fluxes has the dependence of (b(TAE)/B-t)(s). The power s increases from s = 1 to 3 with the increase of the magnetic axis position in finite beta plasmas.
引用
收藏
页码：269 / 272
页数：4
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