Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor

Hao WANG (王灏); Yunfeng LIANG (梁云峰); Shuai XU (徐帅); Zhonghe JIANG (江中和); Yuhe FENG (冯玉和); A KNIEPS; P DREWS; Jie YANG (阳杰); Xin XU (徐鑫); Ting LONG (龙婷)

doi:10.1088/2058-6272/ac224a

Plasma Science and Technology > 2021 > 23(12): 125103. > DOI: 10.1088/2058-6272/ac224a

Hao WANG (王灏), Yunfeng LIANG (梁云峰), Shuai XU (徐帅), Zhonghe JIANG (江中和), Yuhe FENG (冯玉和), A KNIEPS, P DREWS, Jie YANG (阳杰), Xin XU (徐鑫), Ting LONG (龙婷). Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor[J]. Plasma Science and Technology, 2021, 23(12): 125103. DOI: 10.1088/2058-6272/ac224a

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Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor

¹ International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
² Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
³ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
⁴ Max-Planck-Institut fur Plasmaphysik, EURATOM Association, 17491 Greifswald, Germany
⁵ Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
⁶ Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China

Funds: his work is supported by the National Magnetic Confinement Fusion Energy R&D Program of China (Nos. 2018YFE0301104 and 2018YFE0309100), and National Natural Science Foundation of China (No. 51821005).

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Received Date: June 08, 2021
Revised Date: August 28, 2021
Accepted Date: August 29, 2021

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Abstract

Abstract

High-density experiments in the high-field-side mid-plane single-null divertor configuration have been performed for the first time on J-TEXT. The experiments show an increase in the highest central channel line-averaged density from $2.73\,\times \,{10}^{19}\,{{\rm{m}}}^{-3}$ to $6.49\,\times \,{10}^{19}\,{{\rm{m}}}^{-3}$ , while the X-point moves away from the target by increasing the divertor coil current. The corresponding Greenwald fraction rises from 0.50 to 0.79. For the impurity transport, the density normalized radiation intensity (absolute extreme ultraviolet and soft x-ray) of the central channel density decreased significantly (>50%) with an increase in the plasma density. To better understand the underlying physics mechanisms, the 3D edge Monte Carlo code coupled with EIRENE (EMC3- EIRENE) has been implemented for the first time on J-TEXT. The simulation results show good agreement with the experimental findings. As the X-point moves away from the target, the divertor power decay length drops and the scrape-off layer impurity screening effect is enhanced.
- edge plasma transport,
- divertor configuration,
- EMC3-EIRENE

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Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor