TOKAM-3D: A 3D fluid code for transport and turbulence in the edge plasma of Tokamaks

Tamain, P.; Ghendrih, Ph.; Tsitrone, E.; Grandgirard, V.; Garbet, X.; Sarazin, Y.; Serre, Éric; Ciraolo, Guido; Chiavassa, Guillaume

doi:10.1016/j.jcp.2009.09.031

Cited by 49 publications

(53 citation statements)

References 39 publications

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“…Then, a flux-driven model is preferred over a fixed-gradient model because the former is closer to experimental conditions, where profiles result from a balance between sources and losses and are a-priori unknown, exhibiting richer physics such as the appearance of avalanches 6 and self-consistent interactions between the background and the fluctuations. Such fluid flux-driven simulations have emerged, [6][7][8][9] allowing to simulate SOL plasma turbulence and shedding light on the crucial physical phenomena at play in this region. In a recent publication, 10 it has been shown that the gradient-removal theory is able to predict relatively well the sustainable pressure gradient inside the SOL for 3D fluid simulations in limited geometry.…”

Section: Introductionmentioning

confidence: 99%

Aspect ratio effects on limited scrape-off layer plasma turbulence

et al. 2014

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The drift-reduced Braginskii model describing turbulence in the tokamak scrape-off layer is written for a general magnetic configuration with a limiter. The equilibrium is then specified for a circular concentric magnetic geometry retaining aspect ratio effects. Simulations are then carried out with the help of the global, flux-driven fluid three-dimensional code GBS [Ricci et al., Plasma Phys. Controlled Fusion 54, 124047 (2012)]. Linearly, both simulations and simplified analytical models reveal a stabilization of ballooning modes. Nonlinearly, flux-driven nonlinear simulations give a pressure characteristic length whose trends are correctly captured by the gradient removal theory [Ricci and Rogers, Phys. Plasmas 20, 010702 (2013)], that assumes the profile flattening from the linear modes as the saturation mechanism. More specifically, the linear stabilization of ballooning modes is reflected by a 15% increase in the steady-state pressure gradient obtained from GBS nonlinear simulations when going from an infinite to a realistic aspect ratio. V C 2014 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Aspect ratio effects on limited scrape-off layer plasma turbulence

et al. 2014

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“…These equations are general, and can be formulated in an arbitrary coordinate system. Note that similar equations are implemented in other edge and SOL turbulence codes [25,17,[26][27][28][29]. In GBS,…”

Section: Fluid Model Of the Sol Plasmamentioning

confidence: 99%

“…However, the FCI method has been tested for closed field line configuration only. Additionally, several magnetohydrodynamic and turbulence studies have been performed without taking advantage of field-aligned property [14][15][16][17]. Although the required resolution in such cases is higher compared to field-aligned methods, the implementation is usually simpler.…”

Section: Introductionmentioning

confidence: 99%

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Numerical approach to the parallel gradient operator in tokamak scrape-off layer turbulence simulations and application to the GBS code

Jolliet

Halpern

Loizu

et al. 2015

Computer Physics Communications

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a b s t r a c tThis paper presents two discretisation schemes for the parallel gradient operator used in scrape-off layer plasma turbulence simulations. First, a simple model describing the propagation of electrostatic shearAlfvén waves, and retaining the key elements of the parallel dynamics, is used to test the accuracy of the different schemes against analytical predictions. The most promising scheme is then tested in simulations of limited scrape-off layer turbulence with the flux-driven 3D fluid code GBS : the new approach is successfully benchmarked against the original parallel gradient discretisation implemented in GBS. Finally, GBS simulations using a radially varying safety profile, which were inapplicable with the original scheme are carried out for the first time: the well-known stabilisation of resistive ballooning modes at negative magnetic shear is recovered. The main conclusion of this paper is that a simple approach to the parallel gradient, namely centred finite differences in the poloidal and toroidal direction, is able to simulate scrape-off layer turbulence provided that a higher resolution and higher convergence order are used.

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“…One of the uncertainties in making these predictions is the transport across the magnetic field, which is not well described by diffusion [4,5], and is thought to be turbulent [6]. Since the fluctuations can be of similar spatial scales and magnitude to average profiles, significant effort has been devoted to developing and testing 3D flux-driven fluid turbulence simulation codes, including GBS [7,8], TOKAM-3D [9] and TOKAM3X [10].…”

Section: Introductionmentioning

confidence: 99%

Hermes: global plasma edge fluid turbulence simulations

Dudson

Leddy

2017

Plasma Phys. Control. Fusion

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Abstract. The transport of heat and particles in the relatively collisional edge regions of magnetically confined plasmas is a scientifically challenging and technologically important problem. Understanding and predicting this transport requires the self-consistent evolution of plasma fluctuations, global profiles and flows, but the numerical tools capable of doing this in realistic (diverted) geometry are only now being developed.Here a 5-field reduced 2-fluid plasma model for the study of instabilities and turbulence in magnetised plasmas is presented, built on the BOUT++ framework. This cold ion model allows the evolution of global profiles, electric fields and flows on transport timescales, with flux-driven cross-field transport determined self-consistently by electromagnetic turbulence. Developments in the model formulation and numerical implementation are described, and simulations are performed in poloidally limited and diverted tokamak configurations.

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TOKAM-3D: A 3D fluid code for transport and turbulence in the edge plasma of Tokamaks

Cited by 49 publications

References 39 publications

Aspect ratio effects on limited scrape-off layer plasma turbulence

Aspect ratio effects on limited scrape-off layer plasma turbulence

Numerical approach to the parallel gradient operator in tokamak scrape-off layer turbulence simulations and application to the GBS code

Hermes: global plasma edge fluid turbulence simulations

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