Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas

被引：24

作者：

Ida, K

Osakabe, M

Tanaka, K

Minami, T

Nishimura, S

Okamura, S

Fujisawa, A

Yamazaki, K

Yoshimura, Y

Kubo, S

Akiyama, R

Darrow, DS

Idei, H

Iguchi, H

Isobe, M

Kado, S

Kondo, T

Lee, S

Matsuoka, K

Morita, S

Nomura, I

Ohdachi, S

Sasao, M

Shimizu, A

Takagi, S

Takahashi, C

Takayama, S

Takechi, M

Toi, K

Tsumori, K

Watari, T

机构：

[1] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Grad Univ Adv Studies, Hayama, Japan

[3] Nagoya Univ, Dept Energy Engn Sci, Nagoya, Aichi, Japan

来源：

NUCLEAR FUSION | 1999年 / 39卷 / 11Y期

关键词：

D O I：

10.1088/0029-5515/39/11Y/304

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：

A high ion temperature (T-i) mode is observed for neutral beam heated plasmas in the Compact Helical System (CHS) heliotron/torsatron. The high T-i mode plasma is characterized by a high central ion temperature, T-i(0), and is associated with a peaked electron density profile produced by neutral beam fuelling with low wall recycling. Transition from L mode to high T-i mode has been studied in CHS. T-i(0) in the high T-i mode discharges reaches 1 keV, which is 2.5 times higher than that in the L mode discharges. The ion thermal diffusivity is significantly reduced by a factor of more than 2-3 in the high T-i mode plasma. The ion loss cone is observed in neutral particle flux in the energy range 1-6 keV with a narrow range of pitch angle (90 degrees +/- 20 degrees) in the high T-i mode. However, the degradation of ion energy confinement due to this loss cone is negligible.

引用

页码：1649 / 1658

页数：10

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