Observation of Impurity Accumulation After Hydrogen Multi-Pellet Injection in Large Helical Device

被引：4
|
作者：
Dong Chunfeng [1 ]
Morita, Shigeru [1 ,2 ]
Goto, Motoshi [1 ,2 ]
Wang Erhui [2 ]
Motojiama, Gen [1 ]
Murakami, Izumi [1 ]
Sakamoto, Ryuichi [1 ,2 ]
Yamamoto, Norimasa [3 ]
机构：
[1] Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan
[2] Grad Univ Adv Studies, Dept Fus Sci, Toki, Gifu 5095292, Japan
[3] Chubu Univ, Ctr Appl Superconduct & Sustainable Energy Res, Kasugai, Aichi 4878501, Japan
来源：
PLASMA SCIENCE & TECHNOLOGY | 2013年 / 15卷 / 03期
关键词：
impurity accumulation; EUV spectrometer; inward velocity; TRANSPORT; TOKAMAKS; PLASMAS; LHD;
D O I：
10.1088/1009-0630/15/3/08
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：
Impurity accumulation is studied for neutral beam-heated discharges after hydrogen multi-pellet injection in Large Helical Device (LHD). Iron density profiles are derived from radial profiles of EUV line emissions of FeXV-XXIV with the help of the collisional-radiative model. A peaked density profile of Fe23+ is simulated by using one-dimensional impurity transport code. The result indicates a large inward velocity of 6 m/s at the impurity accumulation phase. However, the discharge is not entirely affected by the impurity accumulation, since the concentration of iron impurity, estimated to be 3.3x10(-5) to the electron density, is considerably small. On the other hand, a flat profile is observed for the carbon density of C6+, which is derived from the Z(eff) profile, indicating a small inward velocity of 1 m/s. These results suggest atomic number dependence in the impurity accumulation of LHD, which is similar to the tokamak result.
引用
收藏
页码：230 / 234
页数：5
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