Effects of strike point location on the divertor particle and energy flux decay widths on EAST by experiment and SOLPS modeling

被引：3

作者：

Zhang, Chen ^{[1
]}

Sang, Chaofeng ^{[1
]}

Tao, Yuqiang ^{[2
]}

Jia, Guozhang ^{[3
]}

Meng, Lingyi ^{[3
]}

Wang, Liang ^{[3
]}

Zhang, Bin ^{[3
]}

Xu, Guosheng ^{[3
]}

Zhao, Xuele ^{[1
]}

Wang, Yiling ^{[1
]}

Wang, Dezhen ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Phys, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China

[2] Anhui Normal Univ, Sch Phys & Elect Informat, Wuhu 241000, Peoples R China

[3] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

来源：

NUCLEAR FUSION | 2024年 / 64卷 / 01期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

strike point sweeping; decay width; particle and heat flux density; divertor;

D O I：

10.1088/1741-4326/ad0bd0

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The new lower tungsten divertor of EAST uses a right-angle shape consisted by horizontal and vertical targets, which has the capacity of increasing the divertor closure. The strike point (SP) sweeping experiment is carried out to (1) avoid long-term deposition of particle and heat flux at the same location, thus protecting the target, (2) study the dependence of power control capability on the SP location. The particle and energy flux densities to the target depends strongly on their decay width. Therefore, it is important to know how the SP location influences the outer target (OT) particle parallel lambda js ,OT and OT parallel heat flux decay widths lambda q ,OT. In this work, SOLPS-ITER simulations combined with SP sweeping experiment are applied to study this issue. Four cases, which are taken from different time during SP sweeping (including both horizontal and vertical divertor) in L-mode experiment with high heating power, are selected for investigation. The simulation result is in satisfactory agreement with experiment data, suggesting the simulation is valid. The results indicate that the SP location can affect neutral particles accumulation and ionization positions, thus affecting lambda js ,OT and lambda q ,OT. (1) When SP is located in horizontal target, the higher neutral particle ionization in common flux region leads to wider lambda js ,OT than those of vertical target. (2) When SP is located on horizontal target, the divertor power radiation is higher than that of vertical target, resulting in wider lambda q ,OT. (3) Increasing upstream plasma density can effectively broaden lambda q ,OT, while lambda js ,OT remains almost unchanged. This study improves the understanding of the influence of divertor shape on lambda js ,OT and lambda q ,OT, and can be applied to heat flux control during long-pulse high-power discharges on EAST.

引用

页数：13