Parametrisation of target heat flux distribution and study of transport parameters for boundary modelling in W7-X. (1st October 2022)

• Record Type: Journal Article
• Authors: Bold, David; Reimold, Felix; Niemann, Holger; Gao, Yu; Jakubowski, Marcin; Killer, Carsten; Winters, Victoria R.
• Is Part Of: Nuclear fusion. Volume 62:Number 10(2022)
• Publication Date: 2022-10-01
• Subjects: island scape-off layer -- Wendelstein 7-X -- EMC3-EIRENE -- divertor heat-flux; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/ac7e2f
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Modelling the scrape-off layer (SOL) of a stellarator is challenging due to the complex magnetic 3D geometry. The here presented study analyses simulations of the SOL of the stellarator Wendelstein 7-X using the EMC3-EIRENE code for the magnetic standard configuration. Comparing with experimental observations, the transport model is validated. Based on the experimentally observed strike line width, the anomalous transport coefficients, used as input to the code are determined to around 0.2 m 2 s −1 . This is however in disagreement with upstream measurements, where such small cross-field transport leads to temperatures higher than measured experimentally.