Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST

Abstract The decrease in tungsten (W) content with the higher ion cyclotron resonance heating (ICRH) power is observed and explained for the first time in a high power injection ( P inj > 10 MW), high performance ( β N ∼ 2, β P ∼ 2.8, n e / n GW ∼ 80%, f BS ∼ 60%) H-mode discharge on experimental advanced superconducting tokamak. Unlike the previous phenomenon of electron cyclotron resonance heating core W control (Shi et al 2022 Nucl. Fusion 62 066031), there is a slight change in the background plasma temperature when higher ICRH is applied, but the toroidal rotational velocity decreases by ∼10 km s −1 . Under this condition, the intensity of W unresolved transition array spectral structure in the region of 45–70 Ǻ (which is composed of W 27+ -W 45+ line emissions) and W 44+ density through spectroscopy in the Extreme Ultraviolet region decreases markedly. In addition, the poloidal asymmetry of radiation distribution from the tomographic inversions of Soft x-ray emission is reduced obviously. Theoretical modeling results indicate that the reduction in toroidal rotation leads to less W poloidal asymmetry and neoclassical pinch, which is more efficient in alleviating the core W accumulation than the improvement of isotropic hydrogen (H) minority temperature. The effects of isotropic and anisotropic H minority from ICRH on W transport are compared in the simulation lastly.

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Publication Details

Journal
Nuclear Fusion
Published
2025-01-29
DOI
https://doi.org/10.1088/1741-4326/adafc4
Citations
3
Primary Topic
Metal and Thin Film Mechanics
Type
article
Field-Weighted Citation Impact
2.59

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article

Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST

Shuqi Yang, L. Zhang, Yunxin Cheng, Xiang Gao et al.
3 citations
Nuclear Fusion
Metal and Thin Film Mechanics
2.59
article

Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST

Shuqi Yang, L. Zhang, Yunxin Cheng, Xiang Gao, Kaixuan Ye, Chaowei Mai, Jia Huang, Gongshun Li, Wenmin Zhang, Y. Liang, Ziqiang Zhou, Kangning Geng, Xiang Jian, Fei Wen, Yifei Jin, Tao Zhang, Lin Yu, Shengyu Fu, Zhen Zhou, Shengyu Shi, Ma Jiuyang, Xiaohe Wu
article en
3 citations

Abstract

Abstract The decrease in tungsten (W) content with the higher ion cyclotron resonance heating (ICRH) power is observed and explained for the first time in a high power injection ( P inj > 10 MW), high performance ( β N ∼ 2, β P ∼ 2.8, n e / n GW ∼ 80%, f BS ∼ 60%) H-mode discharge on experimental advanced superconducting tokamak. Unlike the previous phenomenon of electron cyclotron resonance heating core W control (Shi et al 2022 Nucl. Fusion 62 066031), there is a slight change in the background plasma temperature when higher ICRH is applied, but the toroidal rotational velocity decreases by ∼10 km s −1 . Under this condition, the intensity of W unresolved transition array spectral structure in the region of 45–70 Ǻ (which is composed of W 27+ -W 45+ line emissions) and W 44+ density through spectroscopy in the Extreme Ultraviolet region decreases markedly. In addition, the poloidal asymmetry of radiation distribution from the tomographic inversions of Soft x-ray emission is reduced obviously. Theoretical modeling results indicate that the reduction in toroidal rotation leads to less W poloidal asymmetry and neoclassical pinch, which is more efficient in alleviating the core W accumulation than the improvement of isotropic hydrogen (H) minority temperature. The effects of isotropic and anisotropic H minority from ICRH on W transport are compared in the simulation lastly.

Nuclear FusionVol. 65(3)
University of Science and Technology of China (CN), Oak Ridge Associated Universities (US), Forschungszentrum Jülich (DE), Chinese Academy of Sciences (CN), Hefei Institutes of Physical Science (CN), Guangdong Ocean University (CN)
National Natural Science Foundation of China, National Key Research and Development Program of China
Openalex Percentile: Top 13%
Metal and Thin Film Mechanics
2.59
DOIOpen Access PDFOpenAlex
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