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1. The 21N-moment multi-temperature coefficients for Zhdanov closure

Author

Raghunathan, Madhusudan, Marandet, Yannick, Bufferand, Hugo, Ciraolo, Guido, Ghendrih, Philippe, Tamain, Patrick, and Serre, Eric

Subjects
Physics - Plasma Physics
Abstract

We provide the 21N-moment multi-temperature collision coefficients for the Boltzmann collision operator using the Sonine-Hermite polynomial ansatz in the style of Zhdanov et al. First, we outline the general derivation method. Then, we provide the collision coefficients in the most general form in terms of the Chapman-Cowling integrals for any potential of interaction for the 21N-moment approximation. Then, we provide the the collision coefficients for the specific case of the approximated Coulomb potential cross-section with Debye cutoff. These coefficients help in order to find easy implementation in current SOL/edge fluid packages which currently implement the 21N-moment single-temperature coefficients. This provides the completion of a missing link in the current literature., Comment: 19 pages, 0 figures. Accepted by Contributions to Plasma Physics (Dec 2021). arXiv admin note: substantial text overlap with arXiv:2103.02455

Published
2021
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3. Multi-temperature Generalized Zhdanov Closure for Scrape-Off Layer/Edge Applications

Author

Raghunathan, Madhusudan, Marandet, Yannick, Bufferand, Hugo, Ciraolo, Guido, Ghendrih, Philippe, Tamain, Patrick, and Serre, Eric

Subjects
Physics - Plasma Physics
Abstract

The derivation of the multi-temperature generalized Zhdanov closure is provided starting from the most general form of the left hand side of the moment averaged kinetic equation with the Sonine-Hermite polynomial ansatz for an arbitrary number of moments. The process of arriving at the reduced higher-order moment equations, with its assumptions and approximations, is explicitly outlined. The generalized multi-species, multi-temperature coefficients from the authors' previous article are used to compute values of higher order moments such as heat flux in terms of the lower order moments. Transport coefficients and the friction and thermal forces for magnetic confinement fusion relevant cases with the generalized coefficients are compared to the scheme with the single-temperature coefficients previously provided by Zhdanov et al. It is found that the 21N-moment multi-temperature coefficients are adequate for most cases relevant to fusion. Furthermore, the 21N-moment scheme is also tested against the trace approximation to determine the range of validity of the trace approximation with respect to fusion relevant plasmas. Possible refinements to the closure scheme are illustrated as well, in order to account for quantities which might be significant in certain schemes such as the drift approximation., Comment: Submitted to Plasma Physics and Controlled Fusion, July 15, 2021

Published
2021
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4. Generalized Collisional Fluid Theory for Multi-Component, Multi-Temperature Plasma Using The Linearized Boltzmann Collision Operator for Scrape-Off Layer/Edge Applications

Author

Raghunathan, Madhusudan, Marandet, Yannick, Bufferand, Hugo, Ciraolo, Guido, Ghendrih, Philippe, Tamain, Patrick, and Serre, Eric

Subjects
Physics - Plasma Physics
Abstract

Grad's method is used on the linearized Boltzmann collision operator to derive the most general expressions for the collision coefficients for a multi-component, multi-temperature plasma up to rank-2. In doing so, the collision coefficients then get expressed as series sum of pure coefficients of temperature and mass ratios multiplied by the cross-section dependent Chapman-Cowling integrals. These collisional coefficients are compared to previously obtained coefficients by Zhdanov et al [Zhdanov V.M., Transport processes in multi-component plasma, Taylor and Francis (2002)] for 13N-moment multi-temperature scheme. First, the differences in coefficients are compared directly, and then the differences in first approximation to viscosity and friction force are compared. For the 13N-moment multi-temperature coefficients, it is found that they behave reasonably similarly for small temperature differences, but display substantial differences in the coefficients when the temperature differences are high, both for the coefficients and for viscosity and friction force values. Furthermore, the obtained coefficients are compared to the 21N-moment single-temperature approximation provided by Zhdanov et al, and it is seen that the differences are higher than the 13N-moment multi-temperature coefficients, and have substantial differences even in the vicinity of equal temperatures, especially for the viscosity and friction force calculations., Comment: Corrected some typos from the previous version. Accepted by Plasma Physics and Controlled Fusion (April 9,2021)

Published
2021
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5. Fluid and kinetic modelling for non-local heat transport in magnetic fusion devices

Author

Ciraolo, Guido, Bufferand, Hugo, Di Cintio, Pierfrancesco, Ghendrih, Philippe, Lepri, Stefano, Livi, Roberto, Marandet, Yannick, Serre, Eric, Tamain, Patrick, and Valentinuzzi, Matteo

Subjects
Physics - Plasma Physics
Abstract

In order to improve the presently used ad hoc flux limiter treatment of parallel heat flux transport in edge plasma fluid codes we consider here a generalized version of the Fourier law implementing a non-local kernel for the heat flux computation. The Bohm boundary condition at the wall is recovered introducing a volumetric loss term representing the contribution of suprathermal particles to the energy out flux. As expected, this contribution is negligible in the strongly collisional regime while it becomes more and more dominant for marginally and low collisional regimes. In the second part of the paper, we consider a kinetic approach where collisions are considered using the Multi-Particle-Collision (MPC) algorithm. Kinetic simulation results at medium and low collisionality are also reported., Comment: 13 Pages, 6 figures, Accepted for publication in Contributions to Plasma Physics

Published
2018
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7. Introducing electromagnetic effects in Soledge3X.

Author

Düll, Raffael, Bufferand, Hugo, Serre, Eric, Ciraolo, Guido, Quadri, Virginia, Rivals, Nicolas, and Tamain, Patrick

Subjects
PLASMA turbulence, PLASMA Alfven waves, OHM'S law, ELECTROMAGNETIC induction, THEORY of wave motion
Abstract

In the pedestal region, electromagnetic effects affect the evolution of micro‐instabilities and plasma turbulence. The transport code Soledge3X developed by the CEA offers an efficient framework for turbulent 3D simulation on an electrostatic model with a fixed magnetic field. The physical accuracy of the model is improved with electromagnetic induction, driven by the local value of the parallel component of the electromagnetic vector potential A∥$$ {A}_{\parallel } $$, known from Ampère's law. It is solved implicitly in a coupled system with the vorticity equation on the electric potential Φ$$ \Phi $$. The consequence is a basic electromagnetic behavior in the form of shear Alfvén waves. A finite electron mass prevents unphysical speeds but requires solving for the time evolution of the parallel current density j∥$$ {j}_{\parallel } $$ in the generalized Ohm's law. This term can be analytically included with little computational overhead in the system on Φ$$ \Phi $$ and A∥$$ {A}_{\parallel } $$ and improves its numerical condition, facilitating the iterative solving procedure. Simulations on a periodic slab case let us observe the predicted bifurcation of the wave propagation speed between the Alfvén wave and the electron thermal wave speeds for varying perpendicular wavenumbers. The first results on a circular geometry with a limiter attest to the feasibility of turbulent electromagnetic scenarios. [ABSTRACT FROM AUTHOR]

Published
2024
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8. 3D Simulations of Plasma Filaments in the Scrape Off Layer: A Comparison with Models of Reduced Dimensionality

Author

Easy, Luke, Militello, Fulvio, Omotani, John, Dudson, Benjamin, Havlíčková, Eva, Tamain, Patrick, Naulin, Volker, and Nielsen, Anders H.

Subjects
Physics - Plasma Physics
Abstract

This paper presents simulations of isolated 3D filaments in a slab geometry obtained using a 3D reduced fluid code. First, systematic scans were performed to investigate how the dynamics of a filament are affected by its amplitude, perpendicular size and parallel extent. The perpendicular size of the filament was found to have a strong influence on its motions, as it determined the relative importance of parallel currents to polarisation and viscous currents, whilst drift-wave instabilities were observed if the initial amplitude of the blob was increased sufficiently. Next, the 3D simulations were compared to 2D simulations using different parallel closures; namely, the sheath dissipation closure, which neglects parallel gradients, and the vorticity advection closure, which neglects the influence of parallel currents. The vorticity advection closure was found to not replicate the 3D perpendicular dynamics and overestimated the initial radial acceleration of all the filaments studied. In contrast, a more satisfactory comparison with the sheath dissipation closure was obtained, even in the presence of significant parallel gradients, where the closure is no longer valid. Specifically it captured the contrasting dynamics of filaments with different perpen- dicular sizes that were observed in the 3D simulations which the vorticity advection closure failed to replicate. However, neither closure successfully replicated the Boltzmann spinning effects and associated poloidal drift of the blob that was observed in the 3D simulations. Although the sheath dissipation closure was concluded to be more successful in replicating the 3D dynamics, it is emphasised that the vorticity closure may still be relevant for situations where the parallel current is inhibited from closing through the sheath due to effects such as increased resistivity near the targets., Comment: 16 pages, 21 Figures

Published
2014
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9. Role of avalanche transport in competing drift wave and interchange turbulence

Author

Ghendrih, Philippe, primary, Dif-Pradalier, Guilhem, additional, Panico, Olivier, additional, Sarazin, Yanick, additional, Bufferand, Hugo, additional, Ciraolo, Guido, additional, Donnel, Peter, additional, Fedorczak, Nicolas, additional, Garbet, Xavier, additional, Grandgirard, Virginie, additional, Hennequin, Pascale, additional, Serre, Eric, additional, and Tamain, Patrick, additional

Published
2022
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10. Separatrix parameters and core performances across WEST L-mode database

Author

Bourdelle, Clarisse, Morales, Jorge, Artaud, Jean François, Radenac, T., Bucalossi, Jérôme, Clairet, Frédéric, Ciraolo, Guido, Dumont, Rémi, Fedorczak, Nicolas, Gil, Christophe, Goniche, Marc, Guillemaut, Christophe, Gunn, James-Paul, Maget, Patrick, Manas, Pierre, Ostuni, Valeria, Pégourié, Bernard, Peysson, Yves, Tamain, Patrick, Vermare, L., Vezinet, Didier, Camenen, Yann, Grover, Ondrej, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), and The WEST Team

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph]
Abstract

International audience

Published
2022

11. Role of avalanche transport in competing drift wave and interchange turbulence

Author

Ghendrih, Philippe, Dif-Pradalier, Guilhem, Panico, Olivier, Sarazin, Yanick, Bufferand, Hugo, Ciraolo, Guido, Donnel, Peter, Fedorczak, Nicolas, Garbet, Xavier, Grandgirard, Virginie, Hennequin, Pascale, Serre, Eric, Tamain, Patrick, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), École polytechnique (X), Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)

Subjects
History, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Computer Science Applications, Education
Abstract

We complete the 2D 2-fields turbulence model previously used with an interchange-like instability by slightly modifying the parallel loss terms to drive drift wave instabilities. We show that the instability driven by temperature fluctuations of the sheath losses is identical to that of the drift wave turbulence. The linear analysis is performed and used to select control parameters that yield identical maximum growth rates for the interchange alone and drift wave alone instability. Combining the two instabilities doubles the maximum growth rate. The non-linear simulations are used to analyse the SOL width. The simulations allow one to identify a low field side SOL region where interchange and drift wave are unstable and a high field side SOL region where only the drift wave is unstable. The SOL profiles appear exponential in the region close to the source but depart from a simple exponential fall-off in the far SOL. The low field side SOL width is found to be larger in the interchange alone case, slightly smaller when both instabilities are present and finally narrower when only the drift waves. For the high field side SOL, without interchange, the drift wave SOL width is observed to be identical to that on the low field side and larger than that when both instabilities at play. The Sherwood dimensionless parameter, ratio of convective particle flux divided by the diffusive particle flux, is used to compare the efficiency of turbulent transport. The profiles of the Sherwood parameter for time and flux surface averaged transport indicate that turbulent transport is dominant close to the separatrix but is less effective towards the far SOL. The Sherwood parameter evolution, determined with the flux-surface averaged transport, indicates that outward avalanche transport with corrugations governs the case with interchange only. When combining the two instabilities, outward avalanche transport is less pronounced and inward avalanche transport is observed, reducing the overall turbulent transport efficiency. The avalanche transport with drift waves only compared to interchange only is found to be inhibited.

Published
2022

12. First wall fluxes in ITER from full vessel edge-plasma simulations

Author

Rivals, Nicolas, Tamain, Patrick, Marandet, Y, Bonnin, X., Bufferand, Hugo, Falchetto, G., Yang, Hao, Ciraolo, Guido, Pitts, R.A., CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Aix Marseille Université (AMU), ITER organization (ITER), and icard, valerie

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph]
Abstract

International audience

Published
2022

15. Investigation of transport barrier formation in edge turbulent simulations

Author

Bufferand, Hugo, Ciraolo, G., Falchetto, G., Fedorczak, Nicolas, Ghendrih, Ph., Marandet, E., Serre, P., Tamain, Patrick, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), and European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014)

Subjects
[PHYS]Physics [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2021

16. SOL RF physics modelling in Europe, in support of ICRF experiments

Author

Colas Laurent, Lu LingFeng, Jacquot Jonathan, Tierens Wouter, Křivská Alena, Heuraux Stéphane, Faudot Eric, Tamain Patrick, Després Bruno, Van Eester Dirk, Crombé Kristel, Louche Fabrice, Hillairet Julien, Helou Walid, and Goniche Marc

Subjects
Physics, QC1-999
Abstract

A European project was undertaken to improve the available SOL ICRF physics simulation tools and confront them with measurements. This paper first reviews code upgrades within the project. Using the multi-physics finite element solver COMSOL, the SSWICH code couples RF full-wave propagation with DC plasma biasing over “antenna-scale” 2D (toroidal/radial) domains, via non-linear RF and DC sheath boundary conditions (SBCs) applied at shaped plasma-facing boundaries. For the different modules and associated SBCs, more elaborate basic research in RF-sheath physics, SOL turbulent transport and applied mathematics, generally over smaller spatial scales, guides code improvement. The available simulation tools were applied to interpret experimental observations on various tokamaks. We focus on robust qualitative results common to several devices: the spatial distribution of RF-induced DC bias; left-right asymmetries over strap power unbalance; parametric dependence and antenna electrical tuning; DC SOL biasing far from the antennas, and RF-induced density modifications. From these results we try to identify the relevant physical ingredients necessary to reproduce the measurements, e.g. accurate radiated field maps from 3D antenna codes, spatial proximity effects from wave evanescence in the near RF field, or DC current transport. Pending issues towards quantitative predictions are also outlined.

Published
2017
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17. INTERPRETATIVE MODELING OF IMPURITY TRANSPORT AND TUNGSTEN SOURCES IN WEST BOUNDARY PLASMA

Author

Ciraolo, Guido, Di Genova, S., Gallo, Alberto, Fedorczak, Nicolas, Bucalossi, Jérôme, Bufferand, Hugo, Yang, Hao, Marandet, Yannick, Sepetys, Arvydas, Corre, Yann, Desgranges, Corinne, Guirlet, Remy, Guillemaut, Christophe, Gunn, J.P., Tamain, Patrick, Romazanov, J., Brezinsek, S, Klepper, C.C., Tsitrone, Emmanuelle, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association, Oak Ridge National Laboratory [Oak Ridge] (ORNL), UT-Battelle, LLC, WEST team - http://west.cea.fr/WESTteam, European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014), icard, valerie, and Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium - EUROfusion - - H20202014-01-01 - 2018-12-31 - 633053 - VALID

Subjects
[PHYS]Physics [physics], [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], ComputingMilieux_MISCELLANEOUS, [PHYS] Physics [physics]
Abstract

International audience

Published
2021

18. Self-generated reversed radial electric field in 3D global flux-driven fluid edge plasma turbulence simulations

Author

Falchetto, Gloria, Tamain, Patrick, Bufferand, Hugo, Ciraolo, G., Fedorczak, Nicolas, Ghendrih, P, Laribi, Elias, Luce, Benjamin, Serre, Eric, Tatali, Raffaele, icard, valerie, Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium - EUROfusion - - H20202014-01-01 - 2018-12-31 - 633053 - VALID, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
[PHYS]Physics [physics], ComputingMilieux_MISCELLANEOUS, [PHYS] Physics [physics]
Abstract

International audience

Published
2021

19. model of interchange turbulent transport: on the correlation between scrape off layer width and core confinement in tokamaks

Author

Fedorczak, N., Peret, Mathieu, Ghendrih, Philippe, Tamain, Patrick, Bufferand, Hugo, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and icard, valerie

Subjects
[PHYS]Physics [physics], [PHYS.PHYS]Physics [physics]/Physics [physics], Physics::Plasma Physics, [PHYS.PHYS] Physics [physics]/Physics [physics], [PHYS] Physics [physics]
Abstract

International audience;  Spectral filament paradigm: self consistent prediction of turbulent spectra (, Φ) of flux driven 2D isothermal interchange turbulence  Predicts macroscopic transport properties (flux, fluctuations) in scrape-off layer ( SOL width) but also in the core ( confinement time)  SOL transport: quantitative agreement with Tore Supra data (circular plasmas), recovers impact of divertor leg length on SOL width () in TCV, recovers multi-machine parametric sensitivity of  Core confinement: recovers multi-machine parametric sensitivity of and correlation between core confinement and heat flux width  Offers a flexible paradigm for addressing the optimization of power exhaust versus core confinement (key: impact of geometry in model) 2D isothermal interchange model (TOKAM2D)

Published
2019

20. Tomographic reconstruction of COMPASS tokamak edge turbulence from single visible camera data and automatic turbulence structure tracking

Author

Cavalier, Jordan, Lemoine, Nicolas, Brochard, F., Weinzettl, Vladimir, Seidl, Jakub, Silburn, Scott, Tamain, Patrick, Dejarnac, Renaud, Adamek, Jiri, Panek, Radomir, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IPP PRAGUE - Institute of Plasma Physics, Association EURATOM, Institute of Plasma Physics, Association EURATOM (IPP PRAGUE), Czech Academy of Sciences [Prague] (CAS), EURATOM/CCFE Fusion Association, Culham Science Centre [Abingdon], Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institute of Plasma Physics, Association Euratom/IPP.CR (IPP PRAGUE), brochard, frédéric, and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, [SPI.PLASMA] Engineering Sciences [physics]/Plasmas, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; The growing capabilities (speed, sensitivity, dynamic range) of fast visible cameras make this tool more and more interesting for diagnosing turbulence in plasma devices, and in particular, in fusion ones. Especially, cameras' speed is approaching probe acquisition frequencies while they usually reach higher spatial resolution. On the other hand, light emission from a plasma is usually not local and makes the data interpretation difficult. To overcome this 3D problem, imaging of a poloidal gas-puff jet has become a common method. However, this method is known to locally perturb the plasma and to have effect on the probed turbulence [1]. In this contribution, we present tomographic inversion of edge turbulence recorded by a single visible camera observing the interaction between the edge plasma and the neutral gas naturally present in the vacuum vessel (i.e. no extra gas-puff) [2]-therefore a fully passive observation. Since the observed turbulent structures (filaments) are 3D and their images on the camera chip 2D, an assumption has to be taken to avoid ill-posed problems. As velocities of charged particles along field lines are very high, it is possible to assume that light emissivity is constant along that direction and then to reconstruct any poloidal plane in the field of view of the camera. Within this assumption, the method has been carefully checked using synthetic data from the TOKAM3X code [3] and then further validated by comparing experimental camera and Langmuir probe data. Using a recently developed detection and tracking software [4], it is then possible to study the position, size and velocity of the turbulent structures in the reconstructed poloidal plane and to obtain reliable statistics.

Published
2019

21. Fluid description of neutral particles in divertor regimes in WEST

Author

Valentinuzzi, Matteo, Giorgiani, Giorgio, Marandet, Yannick, Bufferand, Hugo, Ciraolo, Guido, Ghendrih, Ph., Tamain, Patrick, Serre, Eric, Ghendrih, Philippe, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), ANR-10-EQPX-0029,EQUIP@MESO,Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale(2010), European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
hybrid model, computational fluid dynamics, Computational fluid dynamics, Kinetic energy, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, models, Discontinuous Galerkin method, Physics::Plasma Physics, 0103 physical sciences, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Kinetic Monte Carlo, 010306 general physics, Physics, Coupling, business.industry, Divertor, Mechanics, Plasma, Solver, Condensed Matter Physics, flow, discontinuous galerkin, transport, simulations, business
Abstract

International audience; A new neutral fluid code has been developed as a necessary step towards a hybrid fluid/kinetic neutral model, to be used in ITER or DEMO simulations, where part of the divertor will be very collisional for neutrals. The neutral fluid code, which is able to handle complex geometries in view of the coupling to Soledge2D, is tested on plasma backgrounds obtained by Soledge2D‐Eirene in WEST geometry, for different divertor regimes, and is found to be in fair agreement with the kinetic Monte Carlo solver Eirene. The differences are due to the simplifications introduced in the fluid model and to the fact that a fluid description is not fully valid in these cases.

Published
2018
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22. Impact of self-consistent neutrals dynamics and particle sources on edge plasma transport and turbulence in 3D first principle simulations

Author

Tamain, Patrick, Baudoin, Camille, Bufferand, Hugo, Ciraolo, Guido, Fan, Dongmei, Fedorczak, Nicolas, Galassi, Davide, Ghendrih, Philippe, Luce, Benjamin, Marandet, Yannick, Nace, Nicolas, Serre, Eric, Schwander, Frédéric, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Boutin, Olivier, and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.GPROC] Engineering Sciences [physics]/Chemical and Process Engineering, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

23. High-Performance Computing at Exascale: challenges and benefits

Author

Lobet, Mathieu, Haefele, Matthieu, Soni, Vineet, Tamain, Patrick, Derouillat, Julien, Beck, Arnaud, Maison de la Simulation (MDLS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut National de Recherche en Informatique et en Automatique (Inria)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

26. Drift-driven cross-field transport and Scrape-Off Layer width in the limit of low anomalous transport

Author

Baudoin, Camille, Tamain, Patrick, Bufferand, Hugo, Ciraolo, Guido, Fedorczak, Nicolas, Galassi, Davide, Gallo, Alberto, Ghendrih, Philippe, Nace, Nicolas, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Modélisation et Simulation Numérique (en mécanique des fluides) (M2P2), Centre National de la Recherche Scientifique (CNRS)-Université de Provence - Aix-Marseille 1-Université Paul Cézanne - Aix-Marseille 3-Université de la Méditerranée - Aix-Marseille 2, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Université de la Méditerranée - Aix-Marseille 2-Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Centre National de la Recherche Scientifique (CNRS), and Baudoin, Camille

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph]
Abstract

The impact of the ∇B-drift in the cross-field transport and its effect on the density and power scrape-off layer (SOL) width in the limit of low anomalous transport is studied with the fluid code SolEdge2D. In a first part of the work, the simulations are run with an isothermal reduced fluid model. It is found that a ∇B-drift dominated regime is reached in all geometries studied (JET-like, ASDEX-like and circular analytic geometries), and that the transition toward this regime comes along with the apparition of supersonic shocks, and a complex parallel equilibrium. The parametric dependencies of the SOL width in this regime are investigated, and the temperature and the poloidal magnetic field are found to be the principal parameters governing the evolution of the SOL width. In the second part of this paper, the impact of additional physics is studied (inclusion of the centrifugal drift, self-consistent variation of temperature and the treatment of the neutral species). The addition of centrifugal drift and neutral species are shown to play a role in the establishment of the parallel equilibrium, impacting the SOL's width. Finally, the numerical results are compared with the estimate of the Goldston's heuristic drift based model (HD-model), which has showed good agreement with experimental scaling laws. We find that the particles SOL's widths in the ∇B-drift dominated regime are, at least, two times smaller than the estimate of the HD-model. Moreover, in the parametric dependencies proposed by the HD-model, only the dependency with B pol is retrieved but not the one on T .

Published
2017

27. Impact of X-point and divertor topology on global turbulent transport in tokamak edge plasma

Author

Galassi, Davide, Tamain, Patrick, Bufferand, Hugo, Baudoin, C., Ciraolo, Guido, Fedorczak, N., Ghendrih, Philippe, Nace, Nicolas, Serre, Eric, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), and conf, M2P2

Subjects
[SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience

Published
2017

28. Impact of diverted geometry on turbulence and transport barrier formation in 3D global simulations of tokamak edge plasma

Author

Galassi, Davide, Tamain, Patrick, Boudoin, C., Bufferand, Hugo, Ciraolo, Guido, N., Fedorzack, Ghendrih, Philippe, Nace, Nicolas, Serre, Eric, conf, M2P2, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience

Published
2017

29. Implementation of drift velocities and currents in SOLEDGE2D-EIRENE

Author

Bufferand, Hugo, Baudoin, C, Bucalossi, J, Ciraolo, G, Denis, Julien, Fedorczak, Nicolas, Galassi, D, Ghendrih, Philippe, Leybros, R, Marandet, Y, Mellet, N, Morales, J, Nace, N, Serre, E, Tamain, Patrick, Valentinuzzi, M, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Ecole Polytechnique Fédérale de Lausanne (EPFL), ANR-10-EQPX-0029,EQUIP@MESO,Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale(2010), European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Edge plasma, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Edge modeling, Edge plasma, Drifts, Edge modeling, Drifts
Abstract

International audience; In order to improve cross-field transport description, drifts and currents have been implemented in SOLEDGE2D-EIRENE. The derivation of an equation for the electric potential is recalled. The resolution of current equation is tested in a simple slab case. WEST divertor simulations in forward-B and reverse-B fields are also discussed. A significant increase of ExB shear is observed in the forward-B configuration that could explain a favorable L-H transition in this case.

Published
2017

34. Width of turbulent SOL in circular plasmas: a theoretical model validated on experiments in Tore Supra tokamak

Author

Fedorczak, Nicolas, Gunn, P, Nace, P, Gallo, P, Baudoin, P, Bufferand, P, Ciraolo, P, Eich, P, Ghendrih, Philippe, Tamain, Patrick, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Max-Planck-Institut für Plasmaphysik [Garching] (IPP), and Fedorczak, Nicolas

Subjects
width, Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], scrape off layer, transport, turbulence, blobs, filaments
Abstract

The relation between turbulent transport and scrape off layer width is investigated in circular plasmas toroidally limited on the inner wall. A broad range of experimental observations collected in the Tore Supra scrape off layer are detailed and compared to turbulent interchange models. Blob velocities agree reasonably well with an analytical model derived for isolated blobs. A set of 2D isothermal turbulence simulations are used to derive a scaling law for the density width. Quantitative agreement is found between this model scaling and experimental density width measured in Tore Supra, over a large set of plasma conditions. The sensitivity to control parameters (major radius, safety factor and normalized Larmor radius) is roughly explained by the sensitivity of the blob velocity model. The predictions are also extended to power decay length in limited plasma configurations. For ITER start-up phases, the predicted power decay length fall in the range of extrapolations based on multi-machine regressions.

Published
2016

35. Interchange Turbulence Model for the Edge Plasma in SOLEDGE2D-EIRENE

Author

Bufferand, Hugo, Ciraolo, Guido, Ghendrih, Philippe, Marandet, Yannick, Bucalossi, J., Colin, C., Fedorczak, Nicolas, Galassi, Davide, Gunn, J., Leybros, R., Serre, E., Tamain, Patrick, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), ANR-10-EQPX-0029,EQUIP@MESO,Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale(2010), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
[PHYS]Physics [physics], [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

15th International Workshop on Plasma Edge Theory in Fusion Devices (PET), Nara Kasugano Int Forum IRAKA, Nara, JAPAN, SEP 09-11, 2015; International audience; Cross-field transport in edge tokamak plasmas is known to be dominated by turbulent transport. A dedicated effort has been made to simulate this turbulent transport from first principle models but the numerical cost to run these simulations on the ITER scale remains prohibitive. Edge plasma transport study relies mostly nowadays on so-called transport codes where the turbulent transport is taken into account using effective ad-hoc diffusion coeffecients. In this contribution, we propose to introduce a transport equation for the turbulence intensity in SOLEDGE2D-EIRENE to describe the interchange turbulence properties. Going beyond the empirical diffusive model, this system automatically generates profiles for the turbulent transport and hence reduces the number of degrees of freedom for edge plasma transport codes. We draw inspiration from the k-epsilon model widely used in the neutral fluid community. ((c) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Published
2016
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36. Effect of Statistical Noise on Simulation Results with a Plasma Fluid Code Coupled to a Monte Carlo Kinetic Neutral Code

Author

Marandet, Yannick, Bufferand, Hugo, Ciraolo, G., Genesio, P., Meliga, P., Rosato, J., Serre, E., Tamain, Patrick, Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011), European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Tokamak, statistical noise, transport codes, edge plasma, Monte Carlo
Abstract

15th International Workshop on Plasma Edge Theory in Fusion Devices (PET), Nara Kasugano Int Forum IRAKA, Nara, JAPAN, SEP 09-11, 2015; International audience; Power exhaust is one of the major challenges that future devices such as ITER and DEMO will face. Because of the lack of identified scaling parameters, predictions for divertor plasma conditions in these devices have to rely on detailed modelling. Most plasma edge simulations carried out so far rely on transport codes, which most of the times consist of a fluid code for the plasma coupled to a kinetic Monte Carlo (MC) code for neutral particles. One of the main difficulties in interpreting code results is the statistical noise from the MC procedure, which makes it difficult to define a convergence criterion for the simulations. In this work, we elaborate on similarities between noisy transport code simulations and turbulence simulations, and argue that the time averaged solution is a well defined stationary solution for the system. We illustrate these ideas with a simple slab test case with fluid neutrals, to which we add synthetic noise. In this case, the effects of noise are found to be significant only at high noise levels and for large enough correlations times.

Published
2016
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37. Impact of drift velocities on divertor flows and steadiness with the transport code SOLEDGE2D-EIRENE

Author

Bufferand, Hugo, Galassi, Davide, Ciraolo, Guido, Marandet, Yannick, Boudoin, C., Bucalossi, Jérôme, Denis, J., Fedorczak, N., Gallo, A., Ghendrih, Philippe, Leybros, R., Schwander, Frédéric, Serre, Eric, Tamain, Patrick, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
ComputingMilieux_MISCELLANEOUS, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience

Published
2016

38. Solution techniques for anisotropic diffusion operators arising in magnetized edge plasma physics

Author

Giorgiani, Giorgio, Serre, Eric, Schwander, Frédéric, Tamain, Patrick, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and conf, M2P2

Subjects
[SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience

Published
2016

39. Interplay between Plasma Turbulence and Particle Injection in 3D Global Simulations

Author

Tamain, Patrick, Bufferand, Hugo, Carbajal, L., Marandet, Yannick, Baudoin, C., Ciraolo, G., Colin, C., Futtersack, R., Galassi, Davide, Ghendrih, Philippe, Nace, N., Schwander, Frédéric, Serre, Eric, Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

15th International Workshop on Plasma Edge Theory in Fusion Devices (PET), Nara Kasugano Int Forum IRAKA, Nara, JAPAN, SEP 09-11, 2015; International audience; The impact of a 3D localized particle source on the edge plasma in 3D global turbulence simulations is investigated using the TOKAM3X fluid code. Results apply to advanced fueling methods such as Supersonic Molecular Beam Injection (SMBI) or pellets injection. The fueling source is imposed as a volumetric particle source in the simulations so that the physics leading to the ionization of particles and its localization are not taken into account. As already observed in experiments, the localized particle source strongly perturbs both turbulence and the large scale organization of the edge plasma. The localized increase of the pressure generated by the source drives sonic parallel flows in the plasma, leading to a poloidal redistribution of the particles on the time scale of the source duration. However, the particle deposition also drives localized transverse pressure gradients which impacts the stability of the plasma with respect to interchange processes. The resulting radial transport occurs on a sufficiently fast time scale to compete with the parallel redistribution of particles, leading to immediate radial losses of a significant proportion of the injected particles. Low Field Side (LFS) and High Field Side (HFS) injections exhibit different dynamics due to their interaction with curvature. In particular, HFS particle deposition drives an inward flux leading to differences in the particle deposition efficiency (higher for HFS than LFS). These results demonstrate the importance of taking into account plasma transport in a self-consistent manner when investigating fueling methods. ((c) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Published
2016
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40. Self-consistent 3D fluid modelling of the interaction between biased Langmuir probes and Scrape-Off-Layer turbulence

Author

Futtersack, R., Colin, Clothilde, Tamain, Patrick, Ciraolo, Guido, Fedorczak, N., Ghendrih, Philippe, Marandet, Yannick, Schwander, Frédéric, Serre, Eric, conf, M2P2, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience

Published
2016

41. Largeur de SOL turbulente dans les plasmas circulaires: un modèle théorique validé sur des expériences du tokamak Tore Supra

Author

Fedorczak, Nicolas, Gunn, P, Nace, P, Gallo, P, Baudoin, P, Bufferand, P, Ciraolo, P, Eich, P, Ghendrih, Philippe, Tamain, Patrick, and Fedorczak, Nicolas

Subjects
width, [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], scrape off layer, transport, turbulence, blobs, filaments
Abstract

The relation between turbulent transport and scrape off layer width is investigated in circular plasmas toroidally limited on the inner wall. A broad range of experimental observations collected in the Tore Supra scrape off layer are detailed and compared to turbulent interchange models. Blob velocities agree reasonably well with an analytical model derived for isolated blobs. A set of 2D isothermal turbulence simulations are used to derive a scaling law for the density width. Quantitative agreement is found between this model scaling and experimental density width measured in Tore Supra, over a large set of plasma conditions. The sensitivity to control parameters (major radius, safety factor and normalized Larmor radius) is roughly explained by the sensitivity of the blob velocity model. The predictions are also extended to power decay length in limited plasma configurations. For ITER start-up phases, the predicted power decay length fall in the range of extrapolations based on multi-machine regressions.

Published
2016

42. Filament dynamics in tokamak scrape-off layer with magnetic shear

Author

Gracias, W.A., Serre, Eric, Tamain, Patrick, Pitts, R., Garcia, L., conf, M2P2, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
[SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience

Published
2016

43. First principle modeling of interplay between Langmuir probe and edge plasma turbulence

Author

R., Futtersack, C., Colin, Tamain, Patrick, G., Ciraolo, Ghendrih, Philippe, Y., Marandet, F., Schwander, E., Serre, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Constant, Eddy

Subjects
[PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2015

44. Preparing WEST tungsten divertor operation: Nitrogen seeded H-mode plasma simulation with SOLEDGE2D-EIRENE

Author

Bufferand, Hugo, G., Ciraolo, Y., Marandet, C., Bourdelle, J., Bucalossi, J., Denis, Fedorczak, Nicolas, D., Galassi, Ghendrih, Philippe, R., Leybros, B., Pégourié, E., SERRE, Tamain, Patrick, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2015

45. A simulation effort of turbulent transport in the edge and SOL plasma of tokamaks, : energy

Author

E., Serre, Bufferand, Hugo, C., Colin, A., Paredes, Ciraolo, Schwander G., Ghendrih, Philippe, Tamain, Patrick, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Constant, Eddy, and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2015

46. Effect of statistical noise on coupled plasma fluid- Monte Carlo kinetic neutrals simulations: investigation based on artificial noise

Author

Y., Marandet, Bufferand, Hugo, G., Ciraolo, Ph., Meliga, J., Rosato, E., Serre, Tamain, Patrick, Constant, Eddy, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2015

47. Investigation of edge and SOL particle flux patterns in high density regimes using SOLEDGE2D-EIRENE code

Author

Ciraolo, Guido, Bufferand, Hugo, Ghendrih, Philippe, Tamain, Patrick, Bucalossi, Jérome, Marandet, Yannick, Serre, Eric, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
Physics::Plasma Physics, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience; We present numerical simulations of plasma transport obtained with the SOLEDGE2D code coupled to the EIRENE Montecarlo code for neutrals. We consider a double null magnetic configuration in a WEST geometry. Density and temperatures parallel profiles in the SOL domain are presented as well as Mach profile. We detail how using the penalization technique we are able to model plasma transport up to the first wall having access to energy and particle fluxes on the entire chamber wall. Moreover, we present the computed 2D contour map of the plasma mach number and of the magnitude of the ionisation source term in the whole poloidal section, emphasizing how complex and realistic geometries can be handled thanks to the penalization technique.

Published
2014
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48. Numerical fluid modelling of the plasma edge response to a 3D object and application to mach probe measurements

Author

Paredes, Alejandro, Serre, Eric, Schwander, Frédéric, Ghendrih, Philippe, Tamain, Patrick, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
penalization, SOL, transport, Langmuir probe, edge plasma, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience; The penalization method is used to model the interaction of 3D probe with an isothermal plasma. Density maps show that the region perturbed by the obstacle, is not restricted to its near neighbourhood, but can extend to the whole SOL. In the particular case of a probe, which is used to measure local plasma parameters, this impact can lead to violation of assumptions of locality of the perturbation usually used in determining Mach number from the imbalance in density on both sides of the probe.

Published
2014
Full Text
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49. 3D properties of edge turbulent transport in full-torus simulations and their impact on poloidal asymmetries

Author

Tamain, Patrick, Bufferand, Hugo, Ciraolo, Guido, Colin, Clothilde, Ghendrih, Philippe, Schwander, Frédéric, Serre, Eric, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
Physics::Fluid Dynamics, Physics::Plasma Physics, Tokamak, turbulence, transport, edge, simulations, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience; The 3D fluid turbulence code TOKAM3X is used to investigate the 3D properties of edge turbulent transport and their impact on poloidal asymmetries. Simulations are run in circular limited plasmas in a domain covering both closed and open flux surfaces. Turbulence characteristics exhibit large inhomogeneities both in the radial and poloidal directions reminiscent of experimental observations. The low field side mid-plane in particular is found to be locally more fluctuating and intermittent than the rest of the Scrape-Off-Layer (SOL). As a consequence of this asymmetry, radial turbulent transport, that represents 80 to 90% of the total radial flux, is strongly ballooned, with 75% of the flux flowing through LFS. The equilibrium of the edge plasma is impacted by this asymmetry through the existence of large amplitude asymmetric parallel flows as well as through the development of poloidally asymmetric radial decay lengths making it impossible to define a single SOL width.

Published
2014
Full Text
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50. Investigation of drift velocity effects on the EDGE and SOL transport

Author

R., Leybros, Bufferand, Hugo, G., Ciraolo, Fedorczak, Nicolas, Ghendrih, Philippe, Hennequin, P., Y., Marandet, E., SERRE, F., Schwander, Tamain, Patrick, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Université Paris-Sud - Paris 11 (UP11)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2013

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