• Letter

High-magnetic-confinement mode in partially magnetized E×B plasmas

June Young Kim, Jaeyoung Choi, Y. S. Hwang, and Kyoung-Jae Chung
Phys. Rev. E 105, L053202 – Published 12 May 2022

Abstract

The suppression of the gradient-drift driven instability and the transition to the high-magnetic-confinement mode are experimentally observed in a cylindrical partially magnetized E×B plasma using an additional biasable electrode installed at the radial edge. When a positive voltage is applied to the electrode, an electron-loss channel forms in its direction, breaking the spatially symmetric nonambipolar flow. Finally, in the steady state, the plasma density tends to peak in the plasma core, approaching plasma densities that are four times larger than those observed in the case where the instability is the strongest. A high-magnetic-confinement mode with a reduced edge-to-center density ratio of 0.16 is observed, which demonstrates that the saturation of magnetic confinement due to the gradient-drift driven instability can be prevented by an asymmetric nonambipolar flow.

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  • Received 18 January 2022
  • Accepted 17 April 2022

DOI:https://doi.org/10.1103/PhysRevE.105.L053202

©2022 American Physical Society

Physics Subject Headings (PhySH)

Plasma Physics

Authors & Affiliations

June Young Kim*, Jaeyoung Choi, Y. S. Hwang, and Kyoung-Jae Chung

  • Department of Nuclear Engineering, Seoul National University, Seoul, Korea

  • *ptcbcg@gmail.com
  • jkjlsh1@snu.ac.kr

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Issue

Vol. 105, Iss. 5 — May 2022

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