Role of recycling flux in gas fuelling in the Large Helical Device

被引:13
作者
Miyazawa, J [1 ]
Masuzaki, S
Yamada, H
Matsuoka, M
Suzuki, H
Morisaki, T
Tanaka, K
Takeiri, Y
Osakabe, M
Narihara, K
Sakakibara, S
Watanabe, KY
Morita, S
Goto, M
Peterson, BJ
Nishimura, K
Yamazaki, K
Matsuoka, K
Motojima, O
机构
[1] Natl Inst Fus Sci, Gifu 5095292, Japan
[2] Mie Univ, Tsu, Mie 5148507, Japan
[3] Chubu Univ, Aichi 4870027, Japan
关键词
D O I
10.1088/0029-5515/44/1/017
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
The 'effective' fuelling efficiency of hydrogen gas puffing ranges from 10% to 50% in the Large Helical Device. A local increase in neutral particle pressure at the gas puff port was measured in the experiment. The pressure increase rate corresponds to similar to10% of the gas puff flux. The other 90% of the gas puff flux increases the density and/or the plasma outflow. A particle balance model reveals that the recycling flux estimated from the particle flux on the divertor plates increases during the gas puffing. It is shown that the high effective fuelling efficiency is possibly due to the large recycling flux. At the limit of small recycling flux, the effective fuelling efficiency decreases to similar to10%. In the helium gas puff discharge, the effective fuelling efficiency is larger than the hydrogen gas puffing and approaches 100%. This can be related to the large recycling coefficient of more than 0.95.
引用
收藏
页码:154 / 161
页数:8
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