Journal ArticleDOI
The impact of the ITER-like wall at JET on disruptions
P. de Vries,G. Arnoux,A. Huber,J. Flanagan,Michael Lehnen,V. Riccardo,C. Reux,S. Jachmich,C.G. Lowry,G. Calabrò,D. Frigione,M. Tsalas,N. Hartmann,S. Brezinsek,M. Clever,D. Douai,M. Groth,T. C. Hender,Etienne Hodille,E. Joffrin,U. Kruezi,G. F. Matthews,J. Morris,R. Neu,V. Philipps,Gennady Sergienko,M. Sertoli,Jet-Efda Contributors +27 more
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TLDR
The full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions, yielding higher plasma temperatures after the thermal quench and thus longer current quench times.Abstract:
The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.read more
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Journal ArticleDOI
The DTT device: Rationale for the choice of the parameters
F. Crisanti,Raffaele Albanese,R. Ambrosino,G. Calabrò,B. P. Duval,G. Giruzzi,Gustavo Granucci,Giorgio Maddaluno,G. Ramogida,H. Reimerdes,R. Zagórski +10 more
TL;DR: The parameters for the design of a “flexible” facility, capable to perform this difficult task, can be worked out within the constraint of a fixed budget.
Journal ArticleDOI
A multi-machine scaling of halo current rotation
Clayton E. Myers,N.W. Eidietis,S.N. Gerasimov,S.P. Gerhardt,Robert Granetz,T. C. Hender,G. Pautasso,Jet Contributors +7 more
TL;DR: Halo currents generated during unmitigated tokamak disruptions are known to develop rotating asymmetric features that are of great concern to ITER because they can dynamically amplify the mechanica.
Journal ArticleDOI
Evolution of plasma parameters in the termination phase of high confinement H-modes at JET and implications for ITER
A. Loarte,F. Koechl,M. Leyland,A. R. Polevoi,M. N. A. Beurskens,Vassili Parail,Isabel L. Nunes,G. Saibene,R. Sartori,Jet-Efda Contributors +9 more
TL;DR: In this paper, the evolution of the parameters of the plasma in the termination phase of high-confinement H-modes at JET with carbon fibre composite plasma facing components (JET-C) has been analysed with a view to predict the plasma energy decrease for sudden terminations of the ITER QDT = 10 scenario caused by malfunction of additional heating systems.
Journal ArticleDOI
Physics of plasma burn-through and DYON simulations for the JET ITER-like wall
TL;DR: In this article, the authors presented the DYON simulations of the deuterium burn-through phase at Joint European Torus (JET) with the ITER-like wall.
Journal ArticleDOI
Overview of disruptions with JET-ILW
S.N. Gerasimov,P. Abreu,G. Artaserse,M. Baruzzo,P. Buratti,Ivo S. Carvalho,I. H. Coffey,I. H. Coffey,E. de la Luna,T. C. Hender,R.B. Henriques,R. Felton,S. Jachmich,U. Kruezi,Peter J. Lomas,P. McCullen,M. Maslov,E. Matveeva,Sara Moradi,L. Piron,F.G. Rimini,W. Schippers,C. Stuart,G. Szepesi,M. Tsalas,D. Valcarcel,Leonid E. Zakharov,Leonid E. Zakharov,Leonid E. Zakharov,and Jet Contributors +29 more
TL;DR: In this paper, the authors present an analysis of disruptions occurring during JET-ILW plasma operations covering the period from 24/08/2011 (#80128) up to 15/11/2016 (#92504).
References
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Journal ArticleDOI
Chapter 3: MHD stability, operational limits and disruptions
T. C. Hender,J.C. Wesley,J.M. Bialek,Anders Bondeson,Allen H. Boozer,R.J. Buttery,Am Garofalo,Timothy Goodman,Robert Granetz,Y. Gribov,O. Gruber,Mikhail Gryaznevich,G. Giruzzi,Sibylle Günter,Nobuhiko Hayashi,Per Helander,Chris Hegna,D. F. Howell,D.A. Humphreys,G. T. A. Huysmans,A.W. Hyatt,Akihiko Isayama,Stephen Jardin,Yasunori Kawano,A. Kellman,C.E. Kessel,H. R. Koslowski,R. J. La Haye,E. Lazzaro,Yueqiang Liu,V.E. Lukash,J. Manickam,S. Medvedev,V. Mertens,S. V. Mirnov,Y. Nakamura,G.A. Navratil,M. Okabayashi,Takahisa Ozeki,Roberto Paccagnella,G. Pautasso,F. Porcelli,V. D. Pustovitov,V. Riccardo,M. Sato,Olivier Sauter,M.J. Schaffer,Michiya Shimada,Piergiorgio Sonato,E. J. Strait,M. Sugihara,Manabu Takechi,A. D. Turnbull,E. Westerhof,D.G. Whyte,R. Yoshino,H. Zohm +56 more
TL;DR: A review of recent advances in the area of MHD stability and disruptions, since the publication of the 1999 ITER Physics Basis document (1999 Nucl. Fusion 39 2137-2664), is reviewed in this paper.
Journal ArticleDOI
Density limits in toroidal plasmas
TL;DR: In addition to the operational limits imposed by MHD stability on plasma current and pressure, an independent limit on plasma density is observed in confined toroidal plasmas as mentioned in this paper, where all toroidal confinement devices considered operate in similar ranges of (suitably normalized) densities.
Journal ArticleDOI
Theory for avalanche of runaway electrons in tokamaks
M.N. Rosenbluth,S.V. Putvinski +1 more
TL;DR: In this paper, an analysis of runaway electron formation and its evolution during disruptions in large tokamaks, where avalanche phenomena play a crucial role, is presented, but sufficiently accurate, analytical model suitable for one dimensional (1-D) transport codes is proposed.
Journal ArticleDOI
Disruptions in tokamaks
TL;DR: The cause and dynamics of disruptions will be described for the many different scenarios that these violent events can follow andibilities will be discussed to avoid or at least to ameliorate the damaging effects of disruptions.
Journal ArticleDOI
Survey of disruption causes at JET
P. de Vries,M.F. Johnson,B. Alper,P. Buratti,T. C. Hender,H. R. Koslowski,V. Riccardo,Jet-Efda Contributors +7 more
TL;DR: In this article, a survey of the causes of all 2309 JET disruptions over the last decade of JET operations was carried out to obtain a complete picture of all possible disruption causes, in order to devise better strategies to prevent or mitigate their impact.
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