Effects of trapped electrons on the ion temperature gradient mode in tokamak plasmas with hollow density profiles

Jingchun LI (李景春); Jiaqi DONG (董家齐); Songfen LIU (刘松芬)

doi:10.1088/2058-6272/ab62e4

Plasma Science and Technology > 2020 > 22(5): 55101-055101. > DOI: 10.1088/2058-6272/ab62e4

Jingchun LI (李景春), Jiaqi DONG (董家齐), Songfen LIU (刘松芬). Effects of trapped electrons on the ion temperature gradient mode in tokamak plasmas with hollow density profiles[J]. Plasma Science and Technology, 2020, 22(5): 55101-055101. DOI: 10.1088/2058-6272/ab62e4

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Effects of trapped electrons on the ion temperature gradient mode in tokamak plasmas with hollow density profiles

¹ School of Physics, Nankai University, Tianjin 300071, People's Republic of China
² University of California, Irvine, CA 92697, United States of America
³ School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
⁴ Southwestern Institute of Physics, Chengdu 610041, People's Republic of China

Funds: This work is supported by the National Key R&D Program of China (Nos. 2018YFE0303102 and 2017YFE0301702), US SciDAC GSEP, the NSFC (Nos. 11905109 and 11947238), the China Postdoctoral Science Foundation (No. 2018M640230), and the Fundamental Research Funds for the Central Universities, Nankai University (63191351).

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Received Date: August 19, 2019
Revised Date: December 12, 2019
Accepted Date: December 16, 2019

Graphical Abstract

Abstract

Abstract

The ion temperature gradient (ITG) mode in the presence of impurity ions and trapped electrons (TEs) is numerically investigated in tokamak plasmas with hollow density profiles, using the gyrokinetic integral eigenmode equation. It is found that in the inverted density plasma, the increase of the ITG enhances the growth rate and frequency of the ITG, and the density gradient plays an important role in the ITG modes. For weak density gradient situations, the trapped electron effects increase the instability of the ITG, while the impurity has an obviously stabilizing effect. For the strong density gradient cases, both the impurities and trapped electrons enhance the ITG instabilities. In addition, it is shown that the growth rate of the ITG decreases with positive magnetic shear s while the real frequency increases with positive magnetic shear. The growth rate of the ITG increases with negative magnetic shear s while the real frequency decreases with negative magnetic shear. The length of the calculated mode structure in the positive and negative magnetic shear intervals is also presented.
- micro-instabilities,
- trapped electrons,
- impurities

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References (32)

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Effects of trapped electrons on the ion temperature gradient mode in tokamak plasmas with hollow density profiles