Modification of the magnetic field structure of high-beta plasmas with a perturbation field in the Large Helical Device

被引：7

作者：

Sakakibara, S. ^{[1
]}

Suzuki, Y. ^{[1
]}

Narushima, Y. ^{[1
]}

Watanabe, K. Y. ^{[1
]}

Takemura, Y. ^{[2
]}

Ohdachi, S. ^{[1
]}

Ida, K. ^{[1
]}

Yoshinuma, M. ^{[1
]}

Narihara, K. ^{[1
]}

Yamada, I. ^{[1
]}

Tanaka, K. ^{[1
]}

Tokuzawa, T. ^{[1
]}

Yamada, H. ^{[1
]}

机构：

[1] Natl Inst Fus Sci, Toki, Gifu 5095292, Japan

[2] Grad Univ Adv Studies, Toki, Gifu 5095292, Japan

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 01期

关键词：

MHD; STABILITY;

D O I：

10.1088/0741-3335/55/1/014014

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 effect of resonant magnetic perturbation (RMP) on MHD characteristics is investigated in high-beta plasmas of the Large Helical Device. The ramp-up and static m/n = 1/1 RMP field are applied in medium-(similar to 2%) and high-(similar to 4%) beta plasmas in order to find beta dependences of mode penetration, MHD activities and confinement. The results show that the threshold of mode penetration linearly increases with the beta value and/or plasma collisionality. The threshold of mode penetration in the RMP ramp-up experiments is roughly consistent with the static RMP case. The beta value gradually decreases with the RMP field strength before mode penetration, which is caused by a reduction in the pressure inside the iota/2 pi = 1 resonance. The width of the magnetic island after the penetration becomes larger than the given RMP field, and it is further enhanced by the increment of the beta value.

引用

页数：6

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