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
Citations
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Journal ArticleDOI
Comparison of different noble gas injections by MGI on plasma disruption mitigation on EAST
Shengbo Zhao,H.D. Zhuang,J.S. Yuan,Dehao Zhang,Li Li,Long Zeng,Dalong Chen,Songtao Mao,Ming-Zhong Huang,Guizhong Zuo,Jiansheng Hu +10 more
TL;DR: In this article, different noble gas injection experiments, including He, Ne, and Ar, were performed to compare the mitigation effect of plasma disruption by evaluating the key parameters such as flight time, pre-thermal quench, and current quench.
Journal ArticleDOI
Performance analysis of the centroid method predictor implemented in the JET real time network
D. Gadariya,Jesús Vega,C. Stuart,Giuseppe Satta,P. Card,A. Murari,Sebastián Dormido-Canto,Jet-Efda Contributors +7 more
TL;DR: The article presents a comparison between the CM predictor and several different disruption detection systems operational in the JET real-time event detection platform named PETRA (Plasma Events Triggering for Alarms).
Journal ArticleDOI
Comparison of different noble gas injections by massive gas injection on plasma disruption mitigation on Experimental Advanced Superconducting Tokamak
TL;DR: In this paper , different noble gas injection experiments, including He, Ne, and Ar, were performed to compare the mitigation effect of plasma disruption by evaluating the key parameters such as flight time, pre-thermal quench, and current quench.
Journal ArticleDOI
Current quench and vessel currents characterisation at the COMPASS tokamak
E. Matveeva,Josef Havlicek,F. J. Artola,V. Yanovskiy,A. Havranek,J. Adamek,J. Gerardin,Martin Imrisek,A. Loarte,Ondrej Ficker,O. Hronova,Vladimir Weinzettl,Radomir Panek +12 more
TL;DR: In this paper, an extensive analysis of the COMPASS tokamak disruption database is presented, which allows the investigation of local toroidal and poloidal vessel currents, including currents flowing along the open magnetic field lines from the plasma to the vacuum vessel (VVV).
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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