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Title: Intense intermittent radiation at the plasma frequency on EAST

Abstract

Intense intermittent radiation has been observed regularly in EAST plasmas herein. The duration of radiation bursts is with a characterization time of a few microseconds. The radiation is very intense, with an equivalent radiation temperature higher than the electron cyclotron emission by a few orders of magnitude. An electron density threshold exists to terminate the bursts, and it is strongly dependent on the toroidal magnetic field. The radiation frequency $f$ is at the plasma frequency, and the frequency bandwidth $Δf$ is very narrow (~1.5 MHz FWHM, $Δf /f$ ~3 × 10 –5). The fine structure of the spectrum in the frequency domain has been observed, and the frequency spacing is around 3 MHz. The cavity modes model is capable of explaining the radiation frequency and the frequency spacing. However, a quantitative and complete description of this phenomenon is still lacking.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1595788
Grant/Contract Number:  
[11375234; 11405211; 2015GB101003; 2015GB103002]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
[ Journal Volume: 59; Journal Issue: 10]; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ωpe bursts; runaway electrons; anomalous Doppler instability; cavity modes

Citation Formats

Liu, Yong, Zhou, Tianfu, Hu, Yemin, Liu, Chang, Zhou, Ruijie, Zhang, Tao, Zhao, Hailin, Zhu, Zeying, Liu, Xiang, and Ling, Bili. Intense intermittent radiation at the plasma frequency on EAST. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab3541.
Liu, Yong, Zhou, Tianfu, Hu, Yemin, Liu, Chang, Zhou, Ruijie, Zhang, Tao, Zhao, Hailin, Zhu, Zeying, Liu, Xiang, & Ling, Bili. Intense intermittent radiation at the plasma frequency on EAST. United States. doi:10.1088/1741-4326/ab3541.
Liu, Yong, Zhou, Tianfu, Hu, Yemin, Liu, Chang, Zhou, Ruijie, Zhang, Tao, Zhao, Hailin, Zhu, Zeying, Liu, Xiang, and Ling, Bili. Fri . "Intense intermittent radiation at the plasma frequency on EAST". United States. doi:10.1088/1741-4326/ab3541.
@article{osti_1595788,
title = {Intense intermittent radiation at the plasma frequency on EAST},
author = {Liu, Yong and Zhou, Tianfu and Hu, Yemin and Liu, Chang and Zhou, Ruijie and Zhang, Tao and Zhao, Hailin and Zhu, Zeying and Liu, Xiang and Ling, Bili},
abstractNote = {Intense intermittent radiation has been observed regularly in EAST plasmas herein. The duration of radiation bursts is with a characterization time of a few microseconds. The radiation is very intense, with an equivalent radiation temperature higher than the electron cyclotron emission by a few orders of magnitude. An electron density threshold exists to terminate the bursts, and it is strongly dependent on the toroidal magnetic field. The radiation frequency $f$ is at the plasma frequency, and the frequency bandwidth $Δf$ is very narrow (~1.5 MHz FWHM, $Δf /f$ ~3 × 10–5). The fine structure of the spectrum in the frequency domain has been observed, and the frequency spacing is around 3 MHz. The cavity modes model is capable of explaining the radiation frequency and the frequency spacing. However, a quantitative and complete description of this phenomenon is still lacking.},
doi = {10.1088/1741-4326/ab3541},
journal = {Nuclear Fusion},
number = [10],
volume = [59],
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
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