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

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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. © 2012 IOP Publishing Ltd.
Original languageEnglish
Article number124032
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number12
DOIs
Publication statusPublished - Dec 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

De Vries, P. C., Arnoux, G., Huber, A., Flanagan, J., Lehnen, M., Riccardo, V., Reux, C., Jachmich, S., Lowry, C., Calabro, G., Frigione, D., Tsalas, M., Hartmann, N., Brezinsek, S., Clever, M., Douai, D., Groth, M., Hender, T. C., Hodille, E., ... Sertoli, M. (2012). The impact of the ITER-like wall at JET on disruptions. Plasma Physics and Controlled Fusion, 54(12), -. [124032]. https://doi.org/10.1088/0741-3335/54/12/124032