This title appears in the Scientific Report :
2021
Universality of the upstream ion to electron temperature ratio dependence on the normalized collisionality in the scrape-off layer of magnetically confined devices
Universality of the upstream ion to electron temperature ratio dependence on the normalized collisionality in the scrape-off layer of magnetically confined devices
Universality of the upstream ion to electron temperature ratio dependence on the normalized collisionality in the scrape-off layer of magnetically confined devices Y. Li1,2, J. Gunn3, X. Liu2, G. Xu2, J. Morales3, C. Gil3, F. Clairet3, D. Vezinet3, N. Yan2, S. Liu2, A. Nielsen4, E. Tsitrone3, S. B...
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Personal Name(s): | Li, Y. (Corresponding author) |
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Gunn, J. / Liu, X. / Xu, G. / Morales, J. / Gil, C. / Clairet, F. / Vezinet, D. / Yan, N. / Liu, S. / Nielsen, A. / Tsitrone, E. / Brezinsek, S. / Liang, Yunfeng / Xiao, C. / Geiger, J. / Killer, C. / Grulke, O. / Jakubowski, M. / Otte, M. / team, the EAST / team, the WEST / team, the W7-X | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Imprint: |
2021
|
Conference: | 24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 2020), virtuell (virtuell), 2021-01-25 - 2021-01-29 |
Document Type: |
Abstract |
Research Program: |
Plasma-Wand-Wechselwirkung |
Publikationsportal JuSER |
Universality of the upstream ion to electron temperature ratio dependence on the normalized collisionality in the scrape-off layer of magnetically confined devices Y. Li1,2, J. Gunn3, X. Liu2, G. Xu2, J. Morales3, C. Gil3, F. Clairet3, D. Vezinet3, N. Yan2, S. Liu2, A. Nielsen4, E. Tsitrone3, S. Brezinsek1, Y. Liang1, C. Xiao5, J. Geiger6, C. Killer6, O. Grulke6, M. Jakubowski6, M. Otte6, the EAST team2, the WEST team3 and the W7-X team61Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China3CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France4Department of Physics, Technical University of Denmark, Kgs. Lyngby, Denmark5Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada6Max-Planck-Institut für Plasmaphysik, Greifswald, GermanyCorresponding author: y.li@fz-juelich.de or ylli@ipp.ac.cn In this paper we analyze the retarding field analyzer and Langmuir probes measurements in the magnetic confinement devices, EAST and WEST and presents the dependence of the upstream plasma parameters, ion and electron temperature and their ratio (Ti/Te), on the plasma control parameters, upstream plasma density, SOL power and magnetic field line connection length. Ion and electron parallel heat fluxes and ion to electron energy transfer rate are also presented as a function of those plasma control parameters. To establish trends in the dependence of Ti/Te on the collisionality, a dimensionless comparison is studied across devices among the tokamak divertor configurations, EAST and WEST, and the stellarator island configuration, W7-X[1]. The results show that these trends are hardly changed despite their quite different magnetic configurations. To understand the SOL ion and electron energy balance, the HESEL model [2] is introduced to reconstruct the probe measurement and predict the relationship between Ti/Te and collisionality near the separatrix. The simulated dependence of Ti/Te on the collisionality is quantitatively consistent with the experimental measurement, while near the separatrix the Ti/Te has a weak dependence on the collisionality. This difference indicates that the conduction and advection ratio might play the dominant role over the magnetic topology effect on the ion and electron energy balance. This work is thought to provide helpful information to optimize the SOL upstream ion temperature operation for both current and future magnetic confined fusion devices. References[1] Y. Li et al. Nuclear Fusion 59 (2019) 126002[2] A. Nielsen et al. Nuclear Fusion 59 (2019) 086059 |