Material migration patterns and overview of first surface analysis of the JET ITER-like wall

A. Widdowson, E. Alves, C. F. Ayres, A. Baron-Wiechec, S. Brezinsek, N. Catarino, J. P. Coad, K. Heinola, J. Likonen, G. F. Matthews, M. Mayer, M. Rubel

Research output: Contribution to journalConference articlepeer-review

59 Scopus citations

Abstract

Following the first JET ITER-like wall operations a detailed in situ photographic survey of the main chamber and divertor was completed. In addition, a selection of tiles and passive diagnostics were removed from the vessel and made available for post mortem analysis. From the photographic survey and results from initial analysis, the first conclusions regarding erosion, deposition, fuel retention and material transport during divertor and limiter phases have been drawn. The rate of deposition on inner and outer base divertor tiles and remote divertor corners was more than an order of magnitude less than during the preceding carbon wall operations, as was the concomitant deuterium retention. There was however beryllium deposition at the top of the inner divertor. The net beryllium erosion rate from the mid-plane inner limiters was found to be higher than for the previous carbon wall campaign although further analysis is required to determine the overall material balance due to erosion and re-deposition.

Original languageEnglish
Article number014010
JournalPhysica Scripta
VolumeT159
DOIs
StatePublished - 2014
Externally publishedYes
Event14th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2013 - Julich, Germany
Duration: 13 May 201317 May 2013

Keywords

  • ion beam analysis
  • plasma-material interaction
  • tokamaks

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