Spatial localization of ECE measurement in EAST LHW-heated plasmas

Yushu ZUO (左雨澍); Yong LIU (刘永); Tianfu ZHOU (周天富); Hailin ZHAO (赵海林); Yang ZHANG (张洋); Lorenzo FIGINI; Ang TI (提昂); Bili LING (凌必利); Liqun HU (胡立群)

doi:10.1088/2058-6272/ab247f

Plasma Science and Technology > 2019 > 21(9): 95103-095103. > DOI: 10.1088/2058-6272/ab247f

Yushu ZUO (左雨澍), Yong LIU (刘永), Tianfu ZHOU (周天富), Hailin ZHAO (赵海林), Yang ZHANG (张洋), Lorenzo FIGINI, Ang TI (提昂), Bili LING (凌必利), Liqun HU (胡立群). Spatial localization of ECE measurement in EAST LHW-heated plasmas[J]. Plasma Science and Technology, 2019, 21(9): 95103-095103. DOI: 10.1088/2058-6272/ab247f

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Spatial localization of ECE measurement in EAST LHW-heated plasmas

¹ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
² University of Science and Technology of China, Hefei 230026, People's Republic of China
³ Istituto di Fisica del Plasma, CNR, 20125 Milano, Italy

Funds: This work was supported by National Natural Science Foundation of China (No. 11405211), and the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology. This work was also partly supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2015GB101003 and 2015GB103002).

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Received Date: April 11, 2019
Revised Date: May 23, 2019
Accepted Date: May 23, 2019

Graphical Abstract

Abstract

Abstract

In this work, electron cyclotron emission (ECE) is simulated by using the code SPECE to study the spatial localization of ECE measurement in EAST plasmas heated by lower hybrid wave (LHW). The results indicate that generally there are two emission layers for an individual frequency in plasmas with non-thermal electrons, and they are separately attributed to the thermal electrons and non-thermal electrons. The emission layer due to the thermal electrons is nearly identical to that for the case with Maxwellian distribution. The emission layer due to non-thermal electrons is well localized in the location of the non-thermal electrons. Even though the non-thermal emission layer is broader, the emission intensity is smaller than that from the thermal emission layer for the cases studied in this work. Localized electron temperature fluctuations can still be distinguished by ECE measurement as long as it does not coexist with the non-thermal electrons. Sawtooth inversion radii and tearing mode island location determined respectively by the ECE measurement and the soft x-ray measurement for a LHW-heated plasma show a good agreement, and this indicates that the ECE measurement in the plasma core region is not seriously polluted.
- EAST,
- ECE,
- LHW,
- non-thermal electrons,
- spatial localization

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References (20)

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