Modeling of plasma beta effects on the island divertor transport in the standard configuration of W7-X

Nuclear Fushion

article

S. Xu¹  Y. Liang¹  A. Knieps¹  S. Zhou²  Y. Feng⁴  D. Reiter⁵  Y. Suzuki⁶  M. Jia³  J. Geiger⁴  F. Reimold⁴  R. König⁴  A. Dinklage⁴  D. Harting¹  Y. Luo¹  P. Drews¹  M. Jakubowski⁴  Y. Gao⁴  E. Pasch⁴  A. Pandey⁴  A. Langenberg⁴  N. Pablant⁷  S. Brezinsek¹  E. Wang¹  S. Liu³  H.M. Xiang¹  O. Neubauer¹  J. Huang¹  J. Cai¹  J. Yang¹  J. Liu¹  L. Liao¹  Y.C. Gao¹ 

[1] Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik;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;Institute of Plasma Physics, Chinese Academy of Sciences;Max-Planck-Institute für Plasmaphysik;Institute for Laser and Plasma Physics, Heinrich-Heine-University;Graduate School of Advanced Science and Engineering, Hiroshima University;Princeton Plasma Physics Laboratory, Princeton

关键词: EMC3-EIRENE;    beta effect;    magnetic topology;    edge plasma transport;    island divertor;   

DOI  :  10.1088/1741-4326/acc7b8

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The influence of plasma beta effects on the edge plasma transport in the Wendelstein 7-X standard configuration is studied systematically by using EMC3-EIRENE combined with a 3D equilibrium code named HINT. The magnetic topology changes induced by plasma beta effects are significantly reflected in plasma transport behaviors and heat flux patterns on divertor targets. After validating the modeling strategy by comparisons with experimental data, the extended simulations for high performance plasmas show that the threshold separatrix density for accessing the power detachment is reduced in higher beta plasmas. Compared with the vacuum field case, the impurity radiation distributions with finite beta effects are modified in the magnetic island region. The divertor heat flux is distributed more evenly along the toroidal direction on the strike line at the vertical target. The strike line on the horizontal target moves towards the pumping gap with an increase in the plasma beta. In addition, the different pressure profiles with the same central beta also result in a modified heat flux pattern on the divertor targets.

【 授权许可】

Unknown