RT Journal Article
T1 The impact of magnetic shear on the dynamics of a seeded 3D filament is slab geometry
A1 Gracias, William Agnelo
A1 Tamain, P.
A1 Serre, E.
A1 Pitts, R.A.
A1 García Gonzalo, Luis
AB Seeded filament simulations are used to study blob dynamics with the state-of-the-art TOKAM3X fluid code in the scrape-off layer (SOL) using a slab geometry. The filamentary dynamics recovered with the code are compared with previously predicted analytical blob velocity scalings while also studying the effect of field line pitch angle on these dynamics and are found to be similar. The effect of changing magnetic topology on filamentary motion is also investigated. Magnetic shear is introduced in the model by the sudden and localised variation of field line pitch angle for a narrow radially located region constituting effectively a shearing zone. Three such shear zones are tested to see how they affect filament motion. Filaments are initialised radially upstream from the shear zone and recorded as they convect towards the far-SOL side. The lowest intensity shear zone allows many of the higher amplitude filaments to pass through after dampening them. On the other hand, the highest intensity shear zones prevent all filaments from progressing to the wall beyond the shear zone and, in certain cases for high density amplitude filaments, is able to generate a new filament downstream from the shear zone.
PB Elsevier
SN 2352-1791
YR 2017
FD 2017-08-01
LK https://hdl.handle.net/10016/38503
UL https://hdl.handle.net/10016/38503
LA eng
NO This work was granted access to the HPC resources of Aix-Marseille Université financed by the project Equip@Meso [project no. ANR-10-EQPX-29-01] of the program « Investissements d'Avenir » supervised by the Agence Nationale de la Recherche. Additional computational resources were used on the high performance URANUS computing cluster located at Universidad Carlos III de Madrid (Spain) [project no. UNC313-4E-2361]. This work was also supported in part by the Ministry of Economy and Competitivity, Spain [project no. ENE2012-38620-C02-02 and ENE2015-68265-P]. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 [agreement no. 633053]. The views and opinions expressed herein do not necessarily reflect those of the European Commission or of the ITER Organization. ITER is the Nuclear Facility INB-174. This work was also supported by AMIDEX project KFC [no. ANR-11-IDEX-00102].
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RD 1 sept. 2024