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
Disruptions in ITER and strategies for their control and mitigation
Michael Lehnen,K. Aleynikova,P. Aleynikov,David Campbell,P. Drewelow,N.W. Eidietis,Yu. Gasparyan,Robert Granetz,Y. Gribov,N. Hartmann,E. M. Hollmann,V.A. Izzo,S. Jachmich,S.H. Kim,M. Kocan,H. R. Koslowski,D. V. Kovalenko,U. Kruezi,A. Loarte,S. Maruyama,G. F. Matthews,P. B. Parks,G. Pautasso,R.A. Pitts,C. Reux,V. Riccardo,R. Roccella,J. A. Snipes,A.J. Thornton,P. de Vries,Efda Jet Contributors +30 more
TL;DR: In this paper, a brief overview on the disruption loads and mitigation strategies for ITER and the physics basis which is continuously refined through the current disruption R&D programs is discussed.
Journal ArticleDOI
Status of research toward the ITER disruption mitigation system
E. M. Hollmann,P B Aleynikov,Tünde Fülöp,David Humphreys,V.A. Izzo,Michael Lehnen,V.E. Lukash,Gergely Papp,G. Pautasso,F. Saint-Laurent,Joseph Snipes +10 more
TL;DR: An overview of the present status of research toward the final design of the ITER disruption mitigation system (DMS) is given in this paper, where the authors discuss the physics and engineering constraints of the design of this system due to limitations on port access and the amount and species of injected impurities.
Journal ArticleDOI
Plasma operation with an all metal first-wall: Comparison of an ITER-like wall with a carbon wall in JET
TL;DR: In this paper, the ITER-like wall (ILW) was installed in the JET to enable a direct comparison of operation with all carbon plasma facing components (PFCs) to an all metal beryllium/tungsten first-wall under identical conditions.
References
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Journal ArticleDOI
Impact of the ITER-like wall on divertor detachment and on the density limit in the JET tokamak
A. Huber,S. Brezinsek,M. Groth,P. de Vries,V. Riccardo,G.J. van Rooij,G. Sergienko,G. Arnoux,A. Boboc,Petra Bilkova,G. Calabrò,M. Clever,J.W. Coenen,M.N.A. Beurskens,T. Eich,S. Jachmich,M. Lehnen,E. Lerche,S. Marsen,G.F. Matthews,K. McCormick,A. Meigs,Ph. Mertens,V. Philipps,Juergen Rapp,U. Samm,M. Stamp,M. Wischmeier,S. Wiesen,Jet-Efda Contributors +29 more
TL;DR: In this article, the ITER-like wall (ILW) was investigated in the recent experimental campaign and compared with experiments in the JET carbon material configuration and the density limit is up to 40% higher in the ILW than in the CFC machine.
Plasma shut-down with fast impurity puff on ASDEX Upgrade
G. Pautasso,Ch. Fuchs,O. Gruber,G. Haas,C. F. Maggi,M. Maraschek,J. Neuhauser,C. Wittmann,E. Wolfrum,M. Beck,P. Cierpka +10 more
TL;DR: In this article, a massive injection of impurity gas into a plasma has been proved to reduce forces and localized thermal loads caused by disruptions in tokamaks, and this mitigation system is routinely used on ASDEX Upgrade to shut down plasmas with a locked mode.
Journal ArticleDOI
Plasma shut-down with fast impurity puff on ASDEX Upgrade
G. Pautasso,Ch. Fuchs,O. Gruber,C. F. Maggi,M. Maraschek,Th. Pütterich,V. Rohde,C. Wittmann,E. Wolfrum,P. Cierpka,M. Beck +10 more
TL;DR: In this paper, a massive injection of impurity gas into a plasma has been proved to reduce forces and localized thermal loads caused by disruptions in tokamaks, and this mitigation system is routinely used on ASDEX Upgrade to shut down plasmas with a locked mode.
Journal ArticleDOI
Overview of the JET ITER-like Wall Project
TL;DR: An overview of the R&D activities for the ITER-like wall (ILW) Project in JET has been presented in this paper, which has been launched in 2005 and will be completed early 2011.
Journal ArticleDOI
Plasma current asymmetries during disruptions in JET
TL;DR: In this article, the authors present an analysis of 4854 disruptions over an 18-year period that includes both the JET carbon (C) wall and the ITER-like (IL) wall (a mixed beryllium/tungsten first wall).
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