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Observing bursting and chirping coherence modes in plasma of solely electron cyclotron wave heating

Published online by Cambridge University Press:  24 October 2024

Mingyuan Wang Open the ORCID record for Mingyuan Wang [Opens in a new window] ,
Jixing Yang Open the ORCID record for Jixing Yang [Opens in a new window] ,
Yuejiang Shi ,
Jiaqi Dong ,
Wenjun Liu ,
Hongyue Li ,
Yingying Li ,
Jie Wu ,
Ad Liu  and
Ge Zhuang
...Show all authors
Mingyuan Wang
Affiliation:
School of Mathematics and Physics, Anqing Normal University, Anqing 246133, PR China International Joint Research Center of Simulation and Control for Population Ecology of Yangtze River in Anhui, Anqing, Anhui 246133, PR China
Jixing Yang*
Affiliation:
School of Mathematics and Physics, Anqing Normal University, Anqing 246133, PR China International Joint Research Center of Simulation and Control for Population Ecology of Yangtze River in Anhui, Anqing, Anhui 246133, PR China
Yuejiang Shi*
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
Jiaqi Dong
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
Wenjun Liu
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
Hongyue Li
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
Yingying Li
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
Jie Wu
Affiliation:
University of Science and Technology of China, Anhui Hefei 230026, PR China
Ad Liu
Affiliation:
University of Science and Technology of China, Anhui Hefei 230026, PR China
Ge Zhuang
Affiliation:
University of Science and Technology of China, Anhui Hefei 230026, PR China
Yahui Wang
Affiliation:
School of Mathematics and Physics, Anqing Normal University, Anqing 246133, PR China International Joint Research Center of Simulation and Control for Population Ecology of Yangtze River in Anhui, Anqing, Anhui 246133, PR China
Ruibo Zhang
Affiliation:
School of Mathematics and Physics, Anqing Normal University, Anqing 246133, PR China International Joint Research Center of Simulation and Control for Population Ecology of Yangtze River in Anhui, Anqing, Anhui 246133, PR China
Baoshan Yuan
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
Y.-K. Martin Peng
Affiliation:
Hebei Key Laboratory of Compact Fusion, Langfang 065001, PR China ENN Science and Technology Development Co., Ltd., Langfang 065001, PR China
*
†Email addresses for correspondence: [email protected], [email protected]
†Email addresses for correspondence: [email protected], [email protected]
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Abstract

This study presents observations of coherent modes (CMs) in a spherical tokamak using a microwave interferometer near the midplane. The CMs within the 30–60 kHz frequency range were observed during electron cyclotron resonance heating only, and the frequency of the CMs increased proportionally with the square root of the electron temperature near $R = 0.7m$. Generally, these modes displayed bursting and chirping signatures with strong density rise and fall. Their appearance indicated an increase in the intensity of hard x rays, suggesting a deterioration in energetic electron confinement. Furthermore, the effect of CMs on the intensity of energetic electron-driven whistler waves was observed. They decreased when CMs were present and gradually increased with the decrease in CM intensity. The CMs may influence the intensity of whistler waves by affecting the energetic electron confinement.

Keywords

plasma wavesplasma nonlinear phenomenaplasma instabilities
Type
Research Article
Information
Journal of Plasma Physics , Volume 90 , Issue 5 , October 2024 , 905900503
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Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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