The GBS code for the self-consistent simulation of plasma turbulence and kinetic neutral dynamics in the tokamak boundary

Giacomin, M.; Ricci, P.; Coroado, A.; Fourestey, G.; Galassi, D.; Lanti, E.; Mancini, D.; Richart, N.; Stenger, L. N.; Varini, N.

doi:10.48550/arxiv.2112.03573

Cited by 2 publications

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“…In this letter we present results of the first global, two-fluid, flux-driven simulation of a stellarator with an island divertor. The simulation is performed with the GBS code, which has been used in the past decade to simulate the tokamak boundary [22][23][24][25][26][27][28], and it is here extended to non-axisymmetric magnetic fields. GBS solves the drift-reduced Braginskii equations [29], valid in the high collisionality regime, which is often justified in the plasma boundary of magnetic fusion devices as well as in the core of low-temperature devices (e.g., TJ-K [30]).…”

Section: Introductionmentioning

confidence: 99%

“…All quantities are evolved in time without separation between equilibrium and fluctuating parts. We consider here the electrostatic limit, we apply the Boussinesq approximation [22], and we neglect gyroviscous terms as well as the coupling to the neutral dynamics, although these are implemented in the most recent version of the GBS code for tokamak simulations [23]. Within these approximations, the drift-reduced model evolved by GBS is:…”

Section: Introductionmentioning

confidence: 99%

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Global fluid simulation of plasma turbulence in a stellarator with an island divertor

et al. 2022

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Results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for a 5-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, similarly 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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global fluid simulation of plasma turbulence in a stellarator with an island divertor

et al. 2022

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“…In this Letter we present results of the first global, two-fluid, flux-driven simulation of a stellarator with an island divertor. The simulation is performed with the GBS code, which has been used in the past decade to simulate the tokamak boundary [20,21,22,23,24,25,26], and it is here extended to non-axisymmetric magnetic fields. GBS solves the drift-reduced Braginskii equations [27], valid in the high collisionality regime, which is often justified in the plasma boundary of magnetic fusion devices as well as in the core of low-temperature devices (e.g., TJ-K [28]).…”

Section: Introductionmentioning

confidence: 99%

“…All quantities are evolved in time without separation between equilibrium and fluctuating parts. We consider here the electrostatic limit, we apply the Boussinesq approximation [20], and we neglect gyroviscous terms as well as the coupling to the neutral dynamics, although these are implemented in the most recent version of the GBS code for tokamak simulations [21]. Within these approximations, the drift-reduced model evolved by GBS is:…”

Section: Introductionmentioning

confidence: 99%

Global fluid simulation of plasma turbulence in a stellarator with an island divertor

Coelho,

Loizu,

Ricci

et al. 2022

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Results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for a 5-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, similarly 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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The GBS code for the self-consistent simulation of plasma turbulence and kinetic neutral dynamics in the tokamak boundary

Abstract: A new version of GBS (Ricci et al.

Cited by 2 publications

References 64 publications

Global fluid simulation of plasma turbulence in a stellarator with an island divertor

Global fluid simulation of plasma turbulence in a stellarator with an island divertor

Global fluid simulation of plasma turbulence in a stellarator with an island divertor

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