Reduction of transport due to magnetic shear in gyrokinetic simulations of the scrape-off layer. (1st August 2022)

• Record Type: Journal Article
• Authors: Mandell, N R; Hammett, G W; Hakim, A; Francisquez, M
• Is Part Of: Plasma physics and controlled fusion. Volume 64:Number 8(2022)
• Publication Date: 2022-08-01
• Subjects: scrape-off layer turbulence -- gyrokinetic simulation -- magnetic confinement -- magnetic shear -- Gkeyll; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/ac72be
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: The effect of varying magnetic shear on scrape-off layer turbulence and profiles is studied via electromagnetic gyrokinetic simulations of a helical scrape-off layer model. We develop a model helical geometry with magnetic shear and a corresponding field-aligned coordinate system, which is used for simulations with the Gkeyll code. We find that perpendicular transport is reduced in cases with stronger shear, resulting in higher peak particle and heat fluxes to the endplates. Electromagnetic effects slightly increase transport in strong shear cases.