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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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2. 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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3. 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. Collisional relaxation and dynamical scaling in multiparticle collisions dynamics

Author

Lepri, Stefano, Bufferand, Hugo, Ciraolo, Guido, Di Cintio, Pierfrancesco, Ghendrih, Philippe, and Livi, Roberto

Subjects
Physics - Plasma Physics
Abstract

We present the Multi-Particle-Collision (MPC) dynamics approach to simulate properties of low-dimensional systems. In particular, we illustrate the method for a simple model: a one-dimensional gas of point particles interacting through stochastic collisions and admitting three conservation laws (density, momentum and energy). Motivated from problems in fusion plasma physics, we consider an energy-dependent collision rate that accounts for the lower collisionality of high-energy particles. We study two problems: (i) the collisional relaxation to equilibrium starting from an off-equilibrium state and (ii) the anomalous dynamical scaling of equilibrium time-dependent correlation functions. For problem (i), we demonstrate the existence of long-lived population of suprathermal particles that propagate ballistically over a quasi-thermalized background. For (ii) we compare simulations with the predictions of nonlinear fluctuating hydrodynamics for the structure factors of density fluctuations. Scaling analysis confirms the prediction that such model belong to the Kardar-Parisi-Zhang universality class., Comment: 12 pages, 4 figures. Accepted for publication in Proceedings of the IHP workshop "Numerical aspects of nonequilibrium dynamics", 25-27 April 2017 Paris, France, in "Proceedings in Mathematics and Statistics" (Springer)

Published
2018
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6. 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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9. Anomalous dynamical scaling in anharmonic chains and plasma models with multiparticle collisions

Author

Di Cintio, Pierfrancesco, Livi, Roberto, Bufferand, Hugo, Ciraolo, Guido, Lepri, Stefano, and Straka, Mika J.

Subjects
Physics - Plasma Physics, Condensed Matter - Statistical Mechanics
Abstract

We study the anomalous dynamical scaling of equilibrium correlations in one dimensional systems. Two different models are compared: the Fermi-Pasta-Ulam chain with cubic and quartic nonlinearity and a gas of point particles interacting stochastically through the multiparticle collision dynamics. For both models -that admit three conservation laws- by means of detailed numerical simulations we verify the predictions of nonlinear fluctuating hydrodynamics for the structure factors of density and energy fluctuations at equilibrium. Despite this, violations of the expected scaling in the currents correlation are found in some regimes, hindering the observation of the asymptotic scaling predicted by the theory. In the case of the gas model this crossover is clearly demonstrated upon changing the coupling constant., Comment: 12 pages, 8 figures. Matching the version published in Phys. Rev. E

Published
2015
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12. 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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13. 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

14. 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

16. Modelling of the retention dynamics at the transition from High-confinement phase to Low-confinement phase in a full-tungsten tokamak

Author

Denis, Julien, Ferro, Yves, Bucalossi, Jérôme, Ciraolo, Guido, Hodille, Etienne, Pegourié, Bernard, Bufferand, Hugo, Grisolia, Christian, Loarer, Thierry, Serre, Eric, Vartanian, Stéphane, Marandet, Yannick, Contributors, Jet, Denis, Julien, 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), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-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], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Abstract

The dynamic retention of deuterium in a full-tungsten JET-like tokamak is investigated thanks to the Dynamics of Wall Elements (DWE) code. DWE is a wall model coupled to the SolEdge-EIRENE edge-plasma transport code. It is composed of two internal codes: (i) WE-temp, which determines the wall temperature, and (ii) MHIMS, which determines the transport, trapping and desorption of hydrogen isotopes in the wall material. In this work, four consecutive discharges are modeled and analysed with DWE. These discharges are identical and present a transition from a H-mode phase to a L-mode phase, which induces strongly different plasma-wall interactions. The main results are as follows. (i) A release of deuterium is observed at the vicinity of both strike-points at the end of the H-mode phase. This dynamics is explained by an increase of the wall temperature at both strike-points due to the strong plasma heat flux received there, leading to detrapping from trap with low detrapping energy. On the contrary, during the subsequent L-mode phase, the wall temperature at the strike-points decreases, leading to retention by filling the trap emptied during the H-mode. (ii) A release of deuterium from the first-wall is unexpectedly observed at the transition between the H-mode and the L-mode. This release is a consequence of a decrease in implantation energy between the two phases, as it entails a shallower implantation of deuterium. Despite the different material considered in the simulation, the latter result offers a possible explanation of the strong transient release of deuterium experimentally observed in the JET-ILW at the NBI cutoff during high density H-mode discharges.

Published
2022

17. Numerical modeling of the impact of leakage under divertor baffle in WEST

Author

Yang, Hao, Ciraolo, Guido, Bufferand, Hugo, Bucalossi, Jérôme, Fedorczak, Nicolas, Tamain, Patrick, Falchetto, G., Rivals, Nicolas, Gunn, J.P., Marandet, Yannick, B., Pégourié, Vartanian, Stéphane, 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), and European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014)

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

International audience

Published
2022

19. Modelling hydrogen transport in ITER divertor

Author

Delaporte-Mathurin, Rémi, Yang, Hao, Denis, Julien, Dark, James, Hodille, Etienne, de Temmerman, Gregory, Bonnin, Xavier, Mougenot, Jonathan, Charles, Y., Bufferand, Hugo, Ciraolo, Guido, Grisolia, Christian, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord, Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), ITER organization (ITER), Zenon Research, and ANR-18-CE05-0012,WHeSCI,Etudes fondamentales sur W, H et He par une approche intégrée(2018)

Subjects
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract

International audience; Hydrogen isotopes transport in tokamaks is a crucial issue for several reasons, especially in the divertor exposed to the highest heat and particles fluxes. First, the total inventory of radioactive material trapped in the reactor must be limited to a certain amount (in ITER, the limit of tritium in the vacuum vessel is 1 kg). Secondly, outgassing of hydrogen from the monoblocks composing the divertor and from the tokamak first wall can reduce the plasma performances. Finally, the lifespan of plasma facing components can be reduced due to hydrogen-induceddamage.A new method coupling 2D Finite Element monoblock simulations of H transport [3] to plasma codes such as SOLPS [4] is presented. This work investigates the influence of the divertor neutral pressure on the full divertor hydrogenic inventory. It is shown that the peak heat flux (and therefore the peak temperature) decreases with the neutral pressure. The H inventory is maximum in the strike points neighbourhood and a local minimum is observed at the strike points. Even considering very conservative assumptions (eg. s of continuous exposure), the total divertor inventory of hydrogen isotopes is around 14 g which is much lower than the ITER safety limit. Moreover, this divertor inventory only varies slightly with the divertor neutral pressure (from 12 g to 14 g)

Published
2021

20. 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

21. Fuel retention in WEST and ITER divertors based on FESTIM monoblock simulations

Author

Delaporte-Mathurin, Rémi, primary, Yang, Hao, additional, Denis, Julien, additional, Dark, James, additional, Hodille, Etienne A., additional, De Temmerman, Gregory, additional, Bonnin, Xavier, additional, Mougenot, Jonathan, additional, Charles, Yann, additional, Bufferand, Hugo, additional, Ciraolo, Guido, additional, and Grisolia, Christian, additional

Published
2021
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22. Complex multi-dimensional modelling of hydrogen transport in ITER and WEST plasma facing components

Author

Delaporte-Mathurin, Rémi, Hodille, Etienne, Mougenot, Jonathan, de Temmerman, Gregory, Charles, Y., Bufferand, Hugo, Yang, Hao, Denis, Julien, Ciraolo, Guido, Grisolia, Christian, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord, ITER organization (ITER), Zenon Research, Physique des interactions ioniques et moléculaires (PIIM), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract

International audience; Understanding hydrogen isotopes transport in plasma facing components is crucial for tokamak operation and for safety issues. Numerical modelling is often required and can be complex when applied to multi-material environments with complex interfaces and geometries (2D/3D). This is the case for many plasma facing components such as the monoblocks that will be used in the divertor of present and future fusion reactors like WEST and ITER. To this day, few studies have simulated hydrogen transport and retention in these components with relevant physics and geometries. To simulate these processes, a finite element modelling code called FESTIM has been developed [1]. FESTIM can perform complex multidimensional simulations with several materials. The code also simulates heat transfer in solids to take into account the non-homogeneous temperature field induced by the non-homogeneous heat flux and by the cooling system. FESTIM has been used to estimate the hydrogen inventory in the ITER divertor with different exposure conditions such as surface temperature and surface hydrogen concentration using machine learning algorithm. The aim of this study is to apply the same methodology to the WEST tokamak using SOLEDGE3X-EIRENE plasma backgrounds in various divertor operational regimes (density scan, power scan). In addition, several ITER operation cases are examined.

Published
2021

23. 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

25. 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

26. L'Interface Plasma-Paroi

Author

Bufferand, Hugo, Bisson, Régis, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Bisson, Régis

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], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract

International audience; Dans l'histoire de la recherche sur la fusion par confinement magnétique, l'interface entre le plasma et la paroi n'a pas toujours été sur le devant de la scène. Près de 70 ans après les premiers tokamaks, contrôler le plasma de bord et son interaction avec la paroi est devenu un enjeu majeur et une thématique de premier plan dans la recherche en fusion.

Published
2020

27. 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

28. Investigation of the dependency of midplane separatrix density as a function of engineering parameters for H-mode pulses in JET with the ITER Like Wall

Author

Balbin, Julio, Bucalossi, Jérôme, Bufferand, Hugo, Ciraolo, Guido, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), and icard, valerie

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

International audience

Published
2019

29. 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

30. 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

31. Effects of the electrostatic shear on the edge plasma in a two-field 휿−흐 like model implemented in the transport code SOLEDGE2D-EIRENE

Author

Baschetti, Serafina, Bufferand, Hugo, Ciraolo, Guido, Ghendrih, Philippe, 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), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), 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

33. 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

34. 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

35. 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

36. 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

37. Nonlocal heat flux application for Scrape-off Layer plasma

Author

Bufferand, Hugo, Ciraolo, G., Di Cintio, P, Fedorczak, N, Ghendrih, Ph, Lepri, S., Livi, R., Marandet, Yannick, Serre, E., Tamain, P., Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Università degli Studi di Firenze = University of Florence (UniFI), 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), Consiglio Nazionale delle Ricerche (CNR), Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI), and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

Subjects
non-local transport, [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], heat conduction, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Plasma physics
Abstract

International audience; The nonlocal expression proposed by Luciani-Mora-Virmont is implemented into a 1D fluid model for the scrape-off layer. Analytic solutions for heat equation are discussed as well as the impact of sheath boundary conditions on the continuity of the temperature profile. The nonlocal heat flux is compared to Spitzer-Härm heat flux for different collisionality.

Published
2017

38. Investigation of the dependency of JET midplane separatrix density as a function of engineering parameters.

Author

Balbin‐Arias, Julio J., Bucalossi, Jerome, Bufferand, Hugo, and Ciraolo, Guido

Subjects
THOMSON scattering, DENSITY, HEAT flux, PLASMA currents
Abstract

Midplane separatrix density is a crucial parameter in tokamaks since it strongly impacts divertor conditions. Scaling midplane separatrix density, ne, SEP, and pedestal density, ne, PED, as function of engineering parameters such as auxiliary heating Pinjected, toroidal magnetic field BT, and plasma poloidal current Ip are relevant to observe the effect of tuning these parameters on, for example, quality of confinement and divertor regime governed by ne, PED and ne, SEP, respectively. Thus, a dataset of JET H‐mode pulses performed with Iter like wall (ILW) has been analysed. Midplane density data are collected from an HRTS (high‐resolution Thomson scattering) diagnostic and ne, SEP is determined using the power balance method. Parallel heat flux model is chosen using transport code SOLEDGE2D (S2D) applying power balance method over a simulated ne, SEP and Te, SEP profiles to obtain separatrix positions. The parameters are averaged over time windows with order of (85–185 ms) and the magnetic configuration has been fixed to avoid divertor geometrical effect on ne, SEP determination, configuration chosen is corner–corner. A ratio between separatrix density and pedestal density at outer midplane ranges between 0.3 and 0.7 on the data set. A scaling law of ne, SEP/ne, PED is obtained as function of Pinjected, BT, and IP. [ABSTRACT FROM AUTHOR]

Published
2020
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43. 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

44. 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

45. 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

46. Self-consistent hydrogen isotopes recycling model for the SolEdge2D-EIRENE transport code

Author

Denis, Julien, Bucalossi, Jérome, Bufferand, Hugo, Ciraolo, Guido, Grisolia, C., Hodille, Etienne, Pégourié, B., 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), 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.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [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

47. Analysis of SOL flows in diverted plasmas

Author

Galassi, Davide, Bufferand, Hugo, Ciraolo, Guido, Colin, Clothilde, Ghendrih, Philippe, 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), conf, M2P2, and Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)

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

International audience

Published
2016

48. Hybrid Formulation of Radiation Transport in Optically Thick Divertor Plasmas

Author

Rosato, Joël, Marandet, Yannick, Bufferand, Hugo, Reiter, D., Stamm, R., 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), Institute of Energy and Climate Research - Plasma Physics (IEK-4), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, and Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association

Subjects
[PHYS]Physics [physics], [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Physics::Plasma Physics, ddc:570, ComputingMilieux_MISCELLANEOUS
Abstract

Kinetic Monte Carlo simulations of coupled atom-radiation transport in optically thick divertor plasmas can be computationally very demanding, in particular in ITER relevant conditions or even larger devices, e.g. for power plant divertor studies. At high (∼ 1015 cm–3) atomic densities, it can be shown that sufficiently large divertors behave in certain areas like a black body near the first resonance line of hydrogen (Lyman α). This suggests that, at least in part, the use of continuum model (radiation hydrodynamics) can be sufficiently accurate, while being less time consuming. In this work, we report on the development of a hybrid model devoted to switch automatically between a kinetic and a continuum description according to the plasma conditions. Calculations of the photo-excitation rate in a homogeneous slab are performed as an illustration. The outlined hybrid concept might be also applicable to neutral atom transport, due to mathematical analogy of transport equations for neutrals and radiation.

Published
2016

49. 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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50. A new look on various aspects of transport code physics

Author

Bufferand, Hugo, J., Bucalossi, G., Ciraolo, Denis, J., Fedorczak, Nicolas, Ghendrih, Philippe, R., Leybros, Y., Marandet, E., SERRE, 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
[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], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2015

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