Hot spots induced by RF-accelerated electrons in the scrape-off layer on Experimental Advanced Superconducting Tokamak

被引：3

作者：

Wang, Y. ^{[1
,2
]}

Hanada, K. ^{[3
]}

Liu, H. ^{[2
]}

Gao, X. ^{[2
]}

Jie, Y. ^{[2
]}

Li, Y. ^{[2
]}

Li, M. ^{[2
]}

Wu, C. ^{[2
]}

Hu, Y. ^{[2
]}

He, K. ^{[2
]}

Zhang, B. ^{[2
]}

Zhang, L. ^{[2
]}

Zang, Q. ^{[2
]}

Zhang, T. ^{[2
]}

Zhou, T. ^{[2
]}

Yu, L. ^{[2
,4
]}

Liang, R. ^{[2
,4
]}

Chu, Y. ^{[5
]}

Xie, J. ^{[2
,4
]}

机构：

[1] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Kasuga 8168580, Japan

[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China

[3] Kyushu Univ, Res Inst Appl Mech, Kasuga 8168580, Japan

[4] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[5] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

来源：

NUCLEAR FUSION | 2023年 / 63卷 / 05期

基金：

国家重点研发计划;

关键词：

hot spot; magnetic configuration; lower hybrid wave; collision damping; LOWER-HYBRID WAVE; PLASMA; OPERATION; ABSORPTION; PROGRESS;

D O I：

10.1088/1741-4326/acb726

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：

Preventing impurity emission from hot spots on plasma-facing materials is a critical issue in the maintenance of high-performance plasma on the Experimental Advanced Superconducting Tokamak (EAST). In this study, experimental and theoretical analyses were performed to investigate the mechanism of hot spot formation. In the upper single null magnetic configuration of the EAST, two separatrices were connected to the upper (primary) and lower (secondary) X-points. Experiments on plasma configuration control indicated that the reduction in the gap between the lower (secondary) separatrix and lower hybrid antenna is effective in preventing hot spot formation on the lower divertor, which frequently emits impurities in long-duration discharges. This effectiveness was quantitatively confirmed by magnetic field lines tracking simulation and calorimetric measurement of divertors in the experiment. Two-frequency power modulation of the lower hybrid wave (LHW) was conducted to evaluate power deposition on the scrape-off layer (SOL) during propagation from the LHW antenna to the main plasma. This experiment clarified that LHW-accelerated electrons in the SOL via collision damping deliver their energies to hot spots along the magnetic field line. These findings help alleviate or even eliminate the formation of hot spots and maintain the performance of plasma.

引用

页数：12