Erosion and deposition in the JET divertor during the first ILW campaign

M. Mayer, S. Krat, W. Van Renterghem, A. Baron-Wiechec, S. Brezinsek, I. Bykov, P. Coad, Yu Gasparyan, K. Heinola, J. Likonen, A. Pisarev, C. Ruset, G. De Saint-Aubin, A. Widdowson

Research output: Contribution to journalConference articlepeer-review

47 Scopus citations

Abstract

Erosion and deposition were studied in the JET divertor during the first JET ITER-like wall campaign 2011 to 2012 using marker tiles. An almost complete poloidal section consisting of tiles 0, 1, 3, 4, 6, 7, 8 was studied. The data from divertor tile surfaces were completed by the analysis of samples from remote divertor areas and from the inner wall cladding. The total mass of material deposited in the divertor decreased by a factor of 4-9 compared to the deposition of carbon during all-carbon JET operation before 2010. Deposits in 2011 to 2012 consist mainly of beryllium with 5-20 at.% of carbon and oxygen, respectively, and small amounts of Ni, Cr, Fe and W. This decrease of material deposition in the divertor is accompanied by a decrease of total deuterium retention inside the JET vessel by a factor of 10 to 20. The detailed erosion/deposition pattern in the divertor with the ITER-like wall configuration shows rigorous changes compared to the pattern with the all-carbon JET configuration.

Original languageEnglish
Article number014051
JournalPhysica Scripta
Volume2016
Issue numberT167
DOIs
StatePublished - 25 Jan 2016
Event15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France
Duration: 18 May 201522 May 2015

Keywords

  • JET-ILW
  • divertor
  • material deposition
  • material erosion
  • surface analysis

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