期刊
NUCLEAR FUSION
卷 62, 期 7, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1741-4326/ac6ad2
关键词
stellarators; turbulence fluid simulation; GBS
资金
- Swiss National Supercomputing Centre (CSCS) [s1118, s1126]
- Swiss National Science Foundation
- Euratom research and training programme 2014-2018 and 2019-2020 [633053]
In this study, results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for a stellarator with an island divertor are presented. The heat from the core is transported along magnetic islands to the island region. Radial transport of particles and heat is primarily driven by a field-aligned coherent mode.
Results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for a five-field period stellarator with an island divertor are presented. The numerical simulation is carried out with the GBS code, recently extended to simulate plasma turbulence in non-axisymmetric magnetic equilibria. The vacuum magnetic field used in the simulation is generated with the theory of Dommaschk potentials, and describes a configuration with a central region of nested flux surfaces, surrounded by a chain of magnetic islands, similar to the diverted configurations of W7-X. The heat outflowing from the core reaches the island region and is transported along the magnetic islands, striking the vessel walls, which correspond to the boundary of the simulation domain. The radial transport of particles and heat is found to be mainly driven by a field-aligned coherent mode with poloidal number m = 4. The analysis of this mode, based on non-local linear theory considerations, shows its ballooning nature. In contrast to tokamak simulations and experiments, where blobs often contribute to transport, we do not observe the presence of intermittent transport events.
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