This content will become publicly available on August 23, 2020
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:
-
[1];
[2];
- Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
- 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}
}
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Works referenced in this record:
Observation and analysis of maser activity in a tokamak plasma
journal, February 1985
- Gandy, R. F.; Hutchinson, I. H.; Yates, D. H.
- Physical Review Letters, Vol. 54, Issue 8
Observations of fluctuating ωp emission in Alcator tokamaks
journal, January 1980
- Hutchinson, I. H.; Kissel, S. E.
- Physics of Fluids, Vol. 23, Issue 8
Spontaneous synchrotron emission from a plasma with an energetic runaway electron tail
journal, January 1978
- Freund, H. P.; Wu, C. S.; Lee, L. C.
- Physics of Fluids, Vol. 21, Issue 9
Spontaneous Emission near the Electron Plasma Frequency in a Plasma with a Runaway Electron Tail
journal, June 1978
- Freund, H. P.; Lee, L. C.; Wu, C. S.
- Physical Review Letters, Vol. 40, Issue 24
Plasma frequency radiation in tokamaks
journal, January 1981
- Swartz, K.
- Physics of Fluids, Vol. 24, Issue 9
High-resolution spectral measurements of fluctuating ωpe emission from Alcator
journal, January 1983
- Hutchinson, I. H.
- Physics of Fluids, Vol. 26, Issue 1
The kinetic theory of runaway electron beam instability in a tokamak
journal, March 1978
- Parail, V. V.; Pogutse, O. P.
- Nuclear Fusion, Vol. 18, Issue 3
Self-consistent nonlinear kinetic simulations of the anomalous Doppler instability of suprathermal electrons in plasmas
journal, October 2013
- Lai, W. N.; Chapman, S. C.; Dendy, R. O.
- Physics of Plasmas, Vol. 20, Issue 10
A triple-wave resonance model for the emission from tokamaks of narrow-band radiation at the plasma frequency
journal, June 1985
- Dendy, R. O.; Lashmore-Davies, C. N.; Shoucri, M. M.
- Nuclear Fusion, Vol. 25, Issue 6
Electron cyclotron emission in Alcator tokamak
journal, October 1977
- Hutchinson, I. H.; Komm, D. S.
- Nuclear Fusion, Vol. 17, Issue 5
Design and characterization of a 32-channel heterodyne radiometer for electron cyclotron emission measurements on experimental advanced superconducting tokamak
journal, July 2014
- Han, X.; Liu, X.; Liu, Y.
- Review of Scientific Instruments, Vol. 85, Issue 7
Feasibility study of fast ion diagnosis in ITER by collective Thomson scattering, millimeter waves to CO2 laser
journal, October 2004
- Bindslev, H.; Meo, F.; Tsakadze, E. L.
- Review of Scientific Instruments, Vol. 75, Issue 10
The prospect for fuel ion ratio measurements in ITER by collective Thomson scattering
journal, January 2012
- Stejner, M.; Korsholm, S. B.; Nielsen, S. K.
- Nuclear Fusion, Vol. 52, Issue 2
First results from gamma ray diagnostics in EAST Tokamak
journal, July 2016
- Zhou, R. J.; Hu, L. Q.; Zhong, G. Q.
- Review of Scientific Instruments, Vol. 87, Issue 11
Coherent emission mechanisms in astrophysical plasmas
journal, July 2017
- Melrose, D. B.
- Reviews of Modern Plasma Physics, Vol. 1, Issue 1
Measurements of Electron Cyclotron Emission from High-Density Tokamak Plasmas in TFR
journal, June 1977
- Costley, A. E.
- Physical Review Letters, Vol. 38, Issue 25
Cavity mode analysis of plasma frequency waves in inhomogeneous cylindrical plasmas
journal, January 1985
- Hutchinson, I. H.; Gandy, R. F.
- Physics of Fluids, Vol. 28, Issue 4
A Michelson Interferometer for Electron Cyclotron Emission Measurements on EAST
journal, November 2016
- Liu, Yong; Schmuck, Stefan; Zhao, Hailin
- Plasma Science and Technology, Vol. 18, Issue 12