Runaway beam studies during disruptions at JET-ILW

C. Reux, V. Plyusnin, B. Alper, D. Alves, B. Bazylev, E. Belonohy, S. Brezinsek, J. Decker, S. Devaux, P. De Vries, A. Fil, S. Gerasimov, I. Lupelli, S. Jachmich, E.M. Khilkevitch, V. Kiptily, R. Koslowski, U. Kruezi, M. Lehnen, A. ManzanaresJ. Mlynář, E. Nardon, E. Nilsson, V. Riccardo, F. Saint-Laurent, A.E. Shevelev, C. Sozzi

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Abstract

Abstract Runaway electrons (RE) during disruptions are a concern for future tokamaks including ITER with its metallic wall. Although RE are rare in spontaneous disruptions with the JET ITER-like Wall (JET-ILW), RE beams up to 380 kA were obtained using massive injection (MGI) of argon in JET-ILW divertor discharges. Entry points into the RE domain defined by operational parameters (toroidal field, argon fraction in MGI) are unchanged but higher RE currents have been obtained inside the JET-ILW MGI-generated RE domain when compared to JET-C. This might be due to the influence of the metallic wall on the current quench plasma. Temperatures of 900°C have been observed following RE impacts on beryllium tiles. Heat deposition depth of ∼2 mm has to be assumed to match the tile cooling time. 3D simulations of the RE energy deposition using the ENDEP/MEMOS codes show that material melting is unlikely with 100 kA RE beams.
Original languageEnglish
Article number48498
Pages (from-to)143 - 149
Number of pages7
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 22 Jul 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Reux, C., Plyusnin, V., Alper, B., Alves, D., Bazylev, B., Belonohy, E., ... Sozzi, C. (2015). Runaway beam studies during disruptions at JET-ILW. Journal of Nuclear Materials, 463, 143 - 149. [48498]. https://doi.org/10.1016/j.jnucmat.2014.10.002