SOLPS-ITER drift modeling of neon impurity seeded plasmas in EAST with favorable and unfavorable toroidal magnetic field direction

Fuqiong WANG; Yunfeng LIANG; Yingfeng XU; Xuejun ZHA; Fangchuan ZHONG; Songtao MAO; Yanmin DUAN; Liqun HU

doi:10.1088/2058-6272/ace026

Plasma Science and Technology > 2023 > 25(11): 115102. > DOI: 10.1088/2058-6272/ace026

Fuqiong WANG, Yunfeng LIANG, Yingfeng XU, Xuejun ZHA, Fangchuan ZHONG, Songtao MAO, Yanmin DUAN, Liqun HU. SOLPS-ITER drift modeling of neon impurity seeded plasmas in EAST with favorable and unfavorable toroidal magnetic field direction[J]. Plasma Science and Technology, 2023, 25(11): 115102. DOI: 10.1088/2058-6272/ace026

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SOLPS-ITER drift modeling of neon impurity seeded plasmas in EAST with favorable and unfavorable toroidal magnetic field direction

1.
Department of Applied Physics, College of Science, Donghua University, Shanghai 201620, People's Republic of China
2.
Member of Magnetic Confinement Fusion Research Center, Ministry of Education, Shanghai 201620, People's Republic of China
3.
Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung Plasmaphysik, Jülich 52425, Germany
4.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

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Corresponding author:
Yunfeng LIANG, E-mail: y.liang@fz-juelich.de

Yingfeng XU, E-mail: xuyingfeng@dhu.edu.cn
Received Date: April 19, 2023
Revised Date: May 29, 2023
Accepted Date: June 19, 2023
Available Online: December 05, 2023
Published Date: July 12, 2023

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Abstract

Abstract

To better understand divertor detachment and asymmetry in the Experimental Advanced Superconducting Tokamak (EAST), drift modeling via the comprehensive edge plasma code SOLPS-ITER of neon impurity seeded plasmas in favorable/unfavorable toroidal magnetic field (B_T) has been performed. Firstly, electrostatic potential/field ( $ϕ$ /E) distribution has been analyzed, to make sure that $ϕ$ and E are correctly described and to better understand drift-driven processes. After that, drift effects on divertor detachment and asymmetry have been focused on. In accordance with the corresponding experimental observations, simulation results demonstrate that in favorable B_T the onset of detachment is highly asymmetric between the inner and outer divertors; and reversing B_T can significantly decrease the magnitude of in-out asymmetry in the onset of detachment, physics reasons for which have been explored. It is found that, apart from the well-known E × B drift particle flow from one divertor to the other through the private flux region, scrape-off layer (SOL) heat flow, which is much more asymmetrically distributed between the high field side and low field side for favorable B_T than that for unfavorable B_T, is also a critical parameter affecting divertor detachment and asymmetry. During detachment, upstream pressure (P_u) reduction occurs and tends to be more dramatical in the colder side than that in the hotter side. The convective SOL heat flow, emerging due to in-out asymmetry in P_u reduction, is found to be critical for understanding divertor detachment and asymmetry observed in EAST. To better understand the calculated drastic power radiation in the core and upstream SOL, drift effects on divertor leakage/retention of neon in EAST with both B_T directions have been addressed for the first time, by analyzing profile of poloidal neon velocity and that of neon ionization source from atoms. This work can be a reference for future numeric simulations performed more closely related to experimental regimes.
- drifts,
- electric potential/field,
- asymmetry,
- divertor detachment,
- impurity transport

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Acknowledgments

This work was supported by National Natural Sciences Foundation of China (Nos. 12075052, 12175034 and 12275098) and National Key R&D Program of China (Nos. 2018YFE0309103, 2017YFE0301100 and 2017YFE0301104). The authors are very grateful to the EAST team for all the support. Numerical computations regarding this work were performed on the ShenMa High Performance Computing Cluster in Institute of Plasma Physics, Chinese Academy of Sciences.

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SOLPS-ITER drift modeling of neon impurity seeded plasmas in EAST with favorable and unfavorable toroidal magnetic field direction

Abstract