Three-dimensional modelling of edge multi-component plasma taking into account realistic wall geometry

The multi-component fluid closure derived by Zhdanov is implemented in the fluid code SOLEDGE3X-EIRENE to deal with arbitrary edge plasma composition. The closure assumes no distinction in between species such as light vs heavy species separation. The work of Zhdanov is rewritten in a matrix form in order to clearly link friction forces and heat fluxes to the different species velocities and temperature gradients.

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“…The same kind of equation provides an expression for the fourth order moment r αZ : 8) α + 7S (9) α c (6) α…”

Section: Friction Forces and Heat Fluxesmentioning

confidence: 99%

Implementation of multi-component Zhdanov closure in SOLEDGE3X

Bufferand¹,

Balbin²,

Baschetti³

et al. 2022

Plasma Phys. Control. Fusion

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“…The multi-fluid nature of S2DE allows the modeling of light impurities without having to enforce the so-called trace approximation, and enables the calculation of the forces that main plasma and impurities exert on each other. This capability was recently enriched with the adoption of a new collisional closure [8] using the equations proposed by Zhdanov in his book [7] to express collisional closure terms such as parallel heat conductivities, collisional forces or thermal equipartition coupling sources. In fact, while the radial, cross-field transport is ruled by mean drifts and turbulence, collisional processes are of great importance for the parallel transport, especially in SOL plasmas.…”

Section: Modeling Of a Generic Light Impurity 41 Impurity Poloidal And Outer Midplane Distributionmentioning

confidence: 99%

Interpretative transport modeling of the WEST boundary plasma: main plasma and light impurities

et al. 2020

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Understanding impurity transport in tokamak plasmas is crucial to control radiative losses and material migration in future magnetic fusion reactors. In this work we deploy the SolEdge2D-EIRENE code to model the boundary plasma in a WEST discharge, satisfactorily reproducing measurements of both upstream and divertor plasma conditions. The spatial distribution of oxygen, studied here as a representative light impurity, is compared to vacuum ultraviolet spectroscopy measurements acquired with an oscillating line of sight. The simulation captures a key feature of the experiment, namely a factor of 2 higher oxygen brightness in the inner divertor region compared to the outer one. This spatial asymmetry in oxygen concentration is interpreted by analyzing the balance of friction forces and thermal gradient forces that the light impurity exchanges with the main plasma.

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“…To obtain an expression for the parallel friction forces and parallel heat fluxes and close the Braginskii equations, we use the collisional closure proposed by Zhdanov in [39], leveraging the formulation presented in [32,50], more suitable for numerical implementation. The application of this procedure to the particular case of the multispecies plasma considered here is described in App.…”

Section: The Three-fluid Drift-reduced Braginskii Equationsmentioning

confidence: 99%

“…App. B presents the derivation of the friction and thermal force terms in the velocity and temperature equations used for the multi-component plasma description, following the Zhdanov closure [39] and considering the approach described in [32]. App.…”

Section: Introductionmentioning

confidence: 99%

A self-consistent multi-component model of plasma turbulence and kinetic neutral dynamics for the simulation of the tokamak boundary

Coroado,

Ricci

2021

Preprint

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A self-consistent model is presented for the simulation of a multi-component plasma in the tokamak boundary. A deuterium plasma is considered, with the plasma species that include electrons, deuterium atomic ions and deuterium molecular ions, while the deuterium atoms and molecules constitute the neutral species. The plasma and neutral models are coupled via a number of collisional interactions, which include dissociation, ionization, charge-exchange and recombination processes. The derivation of the three-fluid drift-reduced Braginskii equations used to describe the turbulent plasma dynamics is presented, including its boundary conditions. The kinetic advection equations for the neutral species are also derived, and their numerical implementation discussed. The first results of multi-component plasma simulations carried out by using the GBS code are then presented and analyzed, being compared with results obtained with the single-component plasma model.

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Three-dimensional modelling of edge multi-component plasma taking into account realistic wall geometry

Cited by 29 publications

References 8 publications

Implementation of multi-component Zhdanov closure in SOLEDGE3X

Implementation of multi-component Zhdanov closure in SOLEDGE3X

Interpretative transport modeling of the WEST boundary plasma: main plasma and light impurities

A self-consistent multi-component model of plasma turbulence and kinetic neutral dynamics for the simulation of the tokamak boundary

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