NUCLEAR TECHNIQUES, Volume. 47, Issue 5, 050006(2024)

Influence of kinetic effects on plasma response to resonant magnetic perturbations in HL-2A tokamak

Yihuizi LIU1,2, Neng ZHANG2, Yueqiang LIU3, Xueyu GONG1、*, Shuo WANG2, Chunyu LI2, Lian WANG2, and Guangzhou HAO2
Author Affiliations
  • 1School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
  • 2Southwestern Institute of Physics, Chengdu 610041, China
  • 3General Atomics, San Diego, CA 92186-5608, United States of America
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    Background

    The control of edge localized modes (ELMs) is a key issue for the safety operation of ITER and future magnetic confinement fusion reactors. In recent years, extensive theoretical simulations and experimental studies have demonstrated that resonant magnetic perturbation (RMP) is a promising method for controlling edge localized modes (ELMs) in H-mode plasmas.

    Purpose

    This study aims to investigate drift kinetic resonant effects of thermal particles on the plasma response to the applied RMP and compare with that of the fluid model for better understanding of ELMs control in HL-2A.

    Methods

    Based on experimental plasma and RMP coil configurations in HL-2A, the MARS-F/K codes were employed to compute the drift dynamic response of plasma to RMP under high constraint mode and compared it with the results of fluid model. Further sensitivity studies were conducted on key parameters including the plasma equilibrium pressure, toroidal flow as well as the thermal particle collision effects.

    Results

    The fluid response model predicts an initially relatively weak enhancement of the plasma response amplitude with the equilibrium pressure parameter βN, followed by a strong variation as βN approaches the Troyon no-wall beta limit. The latter is unphysical and is eliminated by the kinetic response model. Including kinetic response and considering particle collision, the non-adiabatic resonant contribution of trapped thermal ions is found to be significant. Neglecting the particle collision, however, the trapped thermal electron contribution becomes more pronounced.

    Conclusions

    The importance of considering kinetic effects for high-beta plasma response is emphasized by this study. It is important to include the non-adiabatic resonant contribution of trapped particles to the kinetic response while taking into account the particle collision effect.

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    Yihuizi LIU, Neng ZHANG, Yueqiang LIU, Xueyu GONG, Shuo WANG, Chunyu LI, Lian WANG, Guangzhou HAO. Influence of kinetic effects on plasma response to resonant magnetic perturbations in HL-2A tokamak[J]. NUCLEAR TECHNIQUES, 2024, 47(5): 050006

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    Paper Information

    Category: Research Articles

    Received: Feb. 25, 2024

    Accepted: --

    Published Online: Jul. 8, 2024

    The Author Email: Xueyu GONG (龚学余)

    DOI:10.11889/j.0253-3219.2024.hjs.47.050006

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