TY  - JOUR
AU  - WANG, Hao
AU  - LIANG, Yunfeng
AU  - Xu, Shuai
AU  - JIANG, Zhonghe
AU  - FENG, Yuhe
AU  - KNIEPS, A.
AU  - DREWS, P.
AU  - YANG, Jie
AU  - XU, Xin
AU  - LONG, Ting
AU  - JIAO, Shaodong
AU  - ZHANG, Xiaolong
AU  - HAO, Zhigang
AU  - YANG, Qinglong
AU  - CHEN, Zhipeng
AU  - CHEN, Zhongyong
AU  - WANG, Nengchao
AU  - YANG, Zhoujun
AU  - ZHANG, Xiaoqing
AU  - DING, Yonghua
AU  - PAN, Yuan
TI  - Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor
JO  - Plasma science & technology
VL  - 23
IS  - 12
SN  - 1009-0630
CY  - Bristol
PB  - IOP
M1  - FZJ-2021-05652
SP  - 125103 -
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000725865800001
DO  - DOI:10.1088/2058-6272/ac224a
UR  - https://juser.fz-juelich.de/record/904082
ER  -