Effect of magnetic geometry on the energy partition between ions and electrons in the scrape-off layer of magnetic fusion devices. (1st September 2022)

• Record Type: Journal Article
• Authors: Li, Y.; Xu, G.; Dudson, B.; Liu, X.; Huang, Z.; Killer, C.; Feng, Y.; Liu, S.; Yan, N.; Morales, J.; Tsitrone, E.; Brezinsek, S.; Liang, Y.; Eldon, D.; Xiao, C.; Geiger, J.; Grulke, O.; Otte, M.; the WEST Team, ; the W7-X Team,
• Is Part Of: Nuclear fusion. Volume 62:Number 9(2022)
• Publication Date: 2022-09-01
• Subjects: energy partition between ions and electrons -- scrape-off layer -- magnetic connection length -- WEST -- W7-X; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/ac7df1
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: A universal energy partition mechanism between ions and electrons has been confirmed to exist in the scrape-off layer of both the WEST tokamak and the W7-X stellarator. A peaked plasma density structure induced by an infinite magnetic connection length structure is observed to destroy this dependence and enhance the local ion and electron temperature ratio in the stellarator. A theoretical analysis reveals that the ratio of ion and electron parallel heat conduction is predominant in determining this universality, while electrons would further be cooled in the density-peaked region.