Non-inductive plasma current ramp-up through oblique injection of harmonic electron cyclotron waves on the QUEST spherical tokamak

被引：20

作者：

Onchi, T. ^{[1
]}

Idei, H. ^{[1
]}

Fukuyama, M. ^{[2
]}

Ogata, D. ^{[2
]}

Ashida, R. ^{[2
]}

Kariya, T. ^{[3
]}

Ejiri, A. ^{[4
]}

Matsuzaki, K. ^{[4
]}

Osawa, Y. ^{[4
]}

Peng, Y. ^{[4
]}

Kojima, S. ^{[2
]}

Watanabe, O. ^{[4
]}

Hasegawa, M. ^{[1
]}

Nakamura, K. ^{[1
]}

Kuroda, K. ^{[1
]}

Ikezoe, R. ^{[1
]}

Ido, T. ^{[1
]}

Hanada, K. ^{[1
]}

Bertelli, N. ^{[5
]}

Ono, M. ^{[5
]}

Fukuyama, A. ^{[6
]}

机构：

[1] Kyushu Univ, RIAM, Kasuga, Fukuoka 8168580, Japan

[2] Kyushu Univ, IGSES, Kasuga, Fukuoka 8168580, Japan

[3] Univ Tsukuba, Fac Pure & Appl Sci, Tsukuba, Ibaraki 3058577, Japan

[4] Univ Tokyo, Kashiwa, Chiba 2778561, Japan

[5] PPPL, Princeton, NJ 08543 USA

[6] Kyoto Univ, Dept Nucl Engn, Kyoto 6068501, Japan

来源：

PHYSICS OF PLASMAS | 2021年 / 28卷 / 02期

关键词：

38;

D O I：

10.1063/5.0031357

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 plasma current is ramped up primarily by a 28GHz electron cyclotron wave (ECW) in the Q-shu University experiment Steady-State Spherical Tokamak (QUEST), with multiple harmonic resonance layers from the second to the fourth stay in the plasma core. A steering antenna comprising two quasi-optical mirrors enhances the power density of ECWs. The ECW beam is injected obliquely from the low-field side where the parallel refractive index is N parallel to =0.75 at the second-harmonic resonance layer. Analysis of the resonance condition has found that energetic electrons moving forward along the magnetic field resonate more effectively than those moving backward. Such symmetry breaking is consistent with the results of the current ramp-up experiment. The peak plasma current reaches I p > 70 kA, constantly injecting a beam of radio frequency power of 100kW. Ray-tracing by the TASK/WR code demonstrates that the power of the 28GHz extraordinary mode is absorbed by energetic electrons via single-pass cyclotron absorption.

引用

页数：12

共 40 条

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