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Response of Energetic-Particle-Driven Magnetohydrodynamics (MHD) Instability to Modulated ECH in Heliotron J

Yao ZHONG^1,2), Kazunobu NAGASAKI²⁾, Zhibin WANG¹⁾, Shinji KOBAYASHI²⁾, Shigeru INAGAKI²⁾, Takashi MINAMI²⁾, Shinichiro KADO²⁾, Shinsuke OHSHIMA²⁾, Fumiyoshi KIN²⁾, Chenyu WANG²⁾, Yuji NAKAMURA³⁾, Shigeru KONOSHIMA²⁾, Toru MIZUUCHI²⁾, Hiroyuki OKADA²⁾, Nikolai MARUSHCHENKO⁴⁾ and Jian CHEN¹⁾

1)

Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

2)

Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

3)

Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan

4)

Max-Planck Institute for Plasma Physics, Greifswald, Germany

(Received 30 September 2023 / Accepted 29 November 2023 / Published 8 February 2024)

Abstract

The response of energetic particle (EP)-driven magnetohydrodynamic instability to electron cyclotron heating (ECH) was experimentally studied in Heliotron J. The neutral beam injection power remained constant throughout the experiment, and the ECH power was systematically modulated. When the ECH power was gradually decreased to a certain threshold, the excitation of an EP mode with a frequency of approximately 100 kHz was observed. The response to ECH showed a close linkage with variations in electron density and temperature. In addition, a distinct delay response effect concerning plasma pressure suggests a complex delay response of mode excitation and suppression.

Copyright (c) 2024 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

MHD instability, energetic-particle-driven mode, ECH

DOI: 10.1585/pfr.19.1202008

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