Deposition of 13C tracer and impurity elements on the divertor of Wendelstein 7-X

Tomi Vuoriheimo (Corresponding Author), Antti Hakola, Jari Likonen, Sebastijan Brezinsek, Timo Dittmar, Matej Mayer, Chandra Prakash Dhard, Dirk Naujoks, Filip Tuomisto

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Carbon impurity transport and deposition were investigated in the Wendelstein 7-X stellarator by injecting isotopically labelled methane (13CH4) into the edge plasma during the last plasma operations of its Operational Phase (OP) 1.2B experimental campaign. 13C deposition was measured by secondary ion mass spectrometry (SIMS) on three upper divertor tiles located on the opposite side of the vessel to the13CH4 inlet. The highest 13C inventories were found as stripe-like patterns on both sides of the different strike lines. These high deposition areas were also analysed for their impurity contents and the depth profiles of the main elements in the layers. Layered deposition of different impurity elements such as Cr, Ni, Mo and B was found to reflect various events such as high metallic impurities during the OP1.2A and three boronizations carried out during OP1.2B.

Original languageEnglish
Article number124023
JournalPhysica Scripta
Volume96
Issue number12
DOIs
Publication statusPublished - Dec 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • carbon
  • deposition
  • impurity
  • wendelstein 7-X

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