Simulation of plasma turbulence in the periphery of diverted tokamak by using the GBS code

Paruta, Paola; Ricci, P.; Riva, Fabio Matteo; Wersal, C.; Beadle, C.; Frei, B.

doi:10.1063/1.5047741

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Riva_2018_AIP_Implementation of diverted magnetic equilibria

Journal article

Simulation of plasma turbulence in the periphery of diverted tokamak by using the GBS code

Paruta, Paola Swiss Plasma Center (SPC) , Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Ricci, P. ORCID Swiss Plasma Center (SPC) , Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Riva, Fabio Matteo ORCID Istituto ricerche solari Aldo e Cele Daccò (IRSOL), Faculty of Informatics, Università della Svizzera italiana Switzerland - UKAEA-CCFE, Culham Science Center , Abingdon, United Kingdom
Wersal, C. Swiss Plasma Center (SPC) , Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Beadle, C. Swiss Plasma Center (SPC) , Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Frei, B. Swiss Plasma Center (SPC) , Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland

2018

Published in:

Physics of Plasmas. - 2018, vol. 25, no. 11, p. 112301

English We report on the implementation of diverted magnetic equilibria in GBS and on first simulations in this geometry. GBS is a simulation code used to evolve plasma turbulence in the tokamak periphery by solving the drift-reduced Braginskii's equations. The model equations are written in toroidal coordinates, abandoning flux coordinate systems that are not defined at the X-point. A fourth order finite difference scheme is used for the implementation of the spatial operators on poloidally and toroidally staggered grids. The GBS numerical implementation is verified through the method of manufactured solutions. The code convergence properties are tested on a relatively simple analytical X-point configuration. Finally, the diverted equilibrium from a TCV tokamak discharge is implemented in the new version of GBS. The analysis of the simulation results is focused on blob formation, radial transport, and plasma poloidal rotation mechanisms.

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