Journal ArticleDOI
Nonlinear MHD simulations of edge-localized-modes in JET
Stanislas Pamela,G. T. A. Huysmans,M. N. A. Beurskens,Stéphane Devaux,T. Eich,S. Benkadda,Jet-Efda Contributors +6 more
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TLDR
Huysmans et al. as mentioned in this paper presented simulations of ELMs in the JET tokamak for the low-collosionality type-I ELMy H-mode pulse #73569.Abstract:
Nonlinear magneto-hydrodynamic (MHD) simulations with the JOREK code may be used to improve our understanding of edge-localized-modes (ELMs) (Huysmans and Czarny 2007 Nucl. Fusion 47 659?66, Huysmans et al 2009 Plasma Phys. Control. Fusion 51 124012, Pamela et al 2010 Plasma Phys. Control. Fusion 52 075006). These H-mode related instabilities may cause some damage to the tungsten divertor of ITER (Bazylev et al 2007 Phys. Scr. T128 229?33), and it was demonstrated experimentally that the ELM energy losses increase with both machine size and decreasing collisionality (ITER Physics Basis Editors and ITER EDA 1999 Nucl. Fusion 39 2175, Loarte et al 2003 Plasma Phys. Control. Fusion 45 1549?69). In sight of producing simulations of ELMs in ITER, in order to give some predictions of ELM size and divertor heat fluxes in the future device, simulations first need to be quantitatively validated against the experimental data of present machines. This paper presents simulations of ELMs in the JET tokamak for the low-collosionality type-I ELMy H-mode pulse #73569. The simulation results are compared with experimental data to provide a qualitative validation of the simulations. This comparison comprises the dynamics of filaments and divertor heat fluxes, the effect of resistivity and collisionality on ELM energy losses and the observation of ELM precursors prior to the pedestal collapse.read more
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Journal ArticleDOI
Edge-localized-modes in tokamaksa)
TL;DR: In this article, the authors show that when the gradient in the H-mode transport barrier grows to exceed the MHD stability limit, the ELM instability grows explosively, rapidly transporting energy and particles onto open field lines and material surfaces.
Journal ArticleDOI
The JOREK non-linear extended MHD code and applications to large-scale instabilities and their control in magnetically confined fusion plasmas
Matthias Hoelzl,G. T. A. Huijsmans,Stanislas Pamela,M. Becoulet,Eric Nardon,F. J. Artola,Boniface Nkonga,Calin V. Atanasiu,Vinodh Bandaru,Ashish Bhole,Daniele Bonfiglio,A. Cathey,O. Czarny,A. Dvornova,T. Feher,A. Fil,Emmanuel Franck,Shimpei Futatani,M. Gruca,Hervé Guillard,J.W. Haverkort,I. Holod,D. Hu,S. K. Kim,S. Q. Korving,Leon Kos,I. Krebs,L. Kripner,G. Latu,F. Liu,P. Merkel,D. Meshcheriakov,V. Mitterauer,V. Mitterauer,S. Mochalskyy,Jorge Morales,R. Nies,N. Nikulsin,F. Orain,Jane Pratt,R. Ramasamy,Pierre Ramet,C. Reux,K. Särkimäki,N. Schwarz,P. Singh Verma,S. F. Smith,C. Sommariva,E. Strumberger,D. C. van Vugt,M. Verbeek,E. Westerhof,F. Wieschollek,J. Zielinski +53 more
TL;DR: JOREK as mentioned in this paper is a massively parallel fully implicit non-linear extended magneto-hydrodynamic (MHD) code for realistic tokamak X-point plasmas.
Journal ArticleDOI
Power load studies in JET and ASDEX-Upgrade with full-W divertors
B. Sieglin,T. Eich,A. Scarabosio,G. Arnoux,I. Balboa,Stéphane Devaux,A. Herrmann,F. Hoppe,M. Hölzl,A. Kallenbach,Peter Lang,G. F. Matthews,S. Marsen,Stanislas Pamela,M. Rack,Ronald Wenninger,Jet-Efda Contributors +16 more
TL;DR: In this article, the authors present an overview of the current research on divertor power load mechanisms and compare the results obtained in JET with the ITER-like wall (ILW) and ASDEX-Upgrade with tungsten coated plasma-facing components (PFCs).
Journal ArticleDOI
Modelling of edge localised modes and edge localised mode control
G. T. A. Huijsmans,Choong-Seock Chang,Nathaniel Ferraro,L. Sugiyama,Francois Waelbroeck,Xueqiao Xu,A. Loarte,Shimpei Futatani +7 more
TL;DR: In this paper, the authors describe the modeling of edge localised modes and ELM control methods in ITER and discuss the current status and open issues, as well as a review of the current state of the art.
Journal ArticleDOI
Quasineutral plasma expansion into infinite vacuum as a model for parallel ELM transport
TL;DR: In this paper, an analytic solution for the expansion of a plasma into vacuum is assessed for its relevance to the parallel transport of edge localized mode (ELM) filaments along field lines.
References
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Journal ArticleDOI
Nonlinear, three‐dimensional magnetohydrodynamics of noncircular tokamaks
TL;DR: In this article, Rosenbluth's nonlinear, approximate tokamak equations of motion were generalized to three dimensions and conservation laws were derived and a well-known form of the energy principle was recovered from the linearized equations.
Journal ArticleDOI
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
TL;DR: In this article, a code solving the Fokker-planck equation with the full collision operator and including the variation along the magnetic field line, coupled with the adjoint function formalism, has been used to calculate these coefficients in arbitrary equilibrium and collisionality regimes.
Journal ArticleDOI
Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER
A. Loarte,G. Saibene,R. Sartori,David Campbell,M. Becoulet,L. D. Horton,T. Eich,Albrecht Herrmann,G. Matthews,Nobuyuki Asakura,A. V. Chankin,Anthony Leonard,G. Porter,G. Federici,G. Janeschitz,Michiya Shimada,M. Sugihara +16 more
TL;DR: In this paper, the authors show that ELM energy losses are correlated with the density and temperature of the pedestal plasma before the ELM crash and the timescale of ELM particle fluxes.
Journal ArticleDOI
Numerical studies of edge localized instabilities in tokamaks
TL;DR: In this paper, a new computational tool, edge localized instabilities in tokamaks equilibria (ELITE), has been developed to help our understanding of short wavelength instabilities close to the edge of tokak plasmas.
Journal ArticleDOI
MHD stability in X-point geometry: simulation of ELMs
G.T.A. Huysmans,Olivier Czarny +1 more
TL;DR: A non-linear MHD code, named JOREK, is under development with the aim of studying the nonlinear evolution of the MHD instabilities thought to be responsible for edge localized modes (ELMs): external kink (peeling) and medium-n ballooning modes as discussed by the authors.