The impact of the ITER-like wall at JET on disruptions

P. C. De Vries*, G. Arnoux, A. Huber, J. Flanagan, M. Lehnen, V. Riccardo, C. Reux, S. Jachmich, C. Lowry, G. Calabro, D. Frigione, M. Tsalas, N. Hartmann, S. Brezinsek, M. Clever, D. Douai, M. Groth, T. C. Hender, E. Hodille, E. JoffrinU. Kruezi, G. F. Matthews, J. Morris, R. Neu, V. Philipps, G. Sergienko, M. Sertoli, JET-EFDA Contributors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

64 Citations (Scopus)

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.

Original languageEnglish
Article number124032
Pages (from-to)1-9
Number of pages9
JournalNuclear Fusion
Volume52
Issue number3
DOIs
Publication statusPublished - Dec 2012
MoE publication typeA1 Journal article-refereed

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