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

[1] Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak
Idei, H.
Kariya, T.
Imai, T.
Mishra, K.
Onchi, T.
Watanabe, O.
Zushi, H.
Hanada, K.
Qian, J.
Ejiri, A.
Alam, M. M.
Nakamura, K.
Fujisawa, A.
Nagashima, Y.
Hasegawa, M.
Matsuoka, K.
Fukuyama, A.
Kubo, S.
Shimozuma, T.
Yoshikawa, M.
Sakamoto, M.
Kawasaki, S.
Nakashima, H.
Higashijima, A.
Ide, S.
Maekawa, T.
Takase, Y.
Toi, K.
NUCLEAR FUSION, 2017, 57 (12)
[2] Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak
Idei, H.
Onchi, T.
Mishra, K.
Zushi, H.
Kariya, T.
Imai, T.
Watanabe, O.
Ikezoe, R.
Hanada, K.
Ono, M.
Ejiri, A.
Qian, J.
Nakamura, K.
Fujisawa, A.
Nagashima, Y.
Hasegawa, M.
Matsuoka, K.
Fukuyama, A.
Kubo, S.
Yoshikawa, M.
Sakamoto, M.
Kawasaki, S.
Higashijima, A.
Ide, S.
Takase, Y.
Murakami, S.
NUCLEAR FUSION, 2020, 60 (01)
[3] Non-inductive plasma initiation and plasma current ramp-up on the TST-2 spherical tokamak
Takase, Y.
Ejiri, A.
Kakuda, H.
Oosako, T.
Shinya, T.
Wakatsuki, T.
Ambo, T.
Furui, H.
Hashimoto, T.
Hiratsuka, J.
Kasahara, H.
Kato, K.
Kumazawa, R.
Moeller, C. P.
Mutoh, T.
Nakanishi, A.
Nagashima, Y.
Saito, K.
Sakamoto, T.
Seki, T.
Sonehara, M.
Shino, R.
Togashi, H.
Watanabe, O.
Yamaguchi, T.
NUCLEAR FUSION, 2013, 53 (06)
[4] Multi-harmonic electron cyclotron heating and current drive scenarios for non-inductive start-up and ramp-up in high field ST-40 spherical tokamak
Ono, M.
Bertelli, N.
Shevchenko, V
NUCLEAR FUSION, 2022, 62 (10)
[5] PLASMA CURRENT SUSTAINMENT AND RAMP-UP BY ELECTRON-CYCLOTRON WAVES IN THE WT-2 TOKAMAK
ANDO, A
OGURA, K
TANAKA, H
IDA, M
IDE, S
OHO, K
OZAKI, S
NAKAMURA, M
CHO, T
MAEKAWA, T
TERUMICHI, Y
TANAKA, S
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1986, 55 (12) : 4259 - 4271
[6] STUDY OF NON-INDUCTIVE CURRENT RAMP-UP BY NEUTRAL BEAM CURRENT DRIVE
NAKAZATO, T
OKANO, K
SHINYA, K
PLASMA PHYSICS AND CONTROLLED FUSION, 1989, 31 (13) : 1979 - 1993
[7] Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST
Tashima, Saya
Zushi, H.
Isobe, M.
Hanada, K.
Idei, H.
Nakamura, K.
Fujisawa, A.
Matsuoka, K.
Hasegawa, M.
Nagashima, Y.
Okamura, S.
Banerjee, S.
Kawasaki, S.
Nakashima, H.
Higashijima, A.
NUCLEAR FUSION, 2014, 54 (02)
[8] Formation of cold and dense divertor plasma during phases on non-inductive current ramp-up and recharging in tokamak fusion reactor
Hitoki, Shigehisa
Sugihara, Masayoshi
Yamamoto, Shin
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 1988, 27 (07): : 1291 - 1298
[9] Investigation of runaway electrons in the current ramp-up by a fully non-inductive lower hybrid current drive on the EAST tokamak
Lu, H. W.
Zha, X. J.
Zhong, F. C.
Hu, L. Q.
Zhou, R. J.
PHYSICA SCRIPTA, 2013, 87 (05)
[10] FORMATION OF COLD AND DENSE DIVERTOR PLASMA DURING PHASES OF NON-INDUCTIVE CURRENT RAMP-UP AND RECHARGING IN TOKAMAK FUSION-REACTOR
HITOKI, S
SUGIHARA, M
YAMAMOTO, S
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1988, 27 (07): : 1291 - 1298

← 1 2 3 4 →