Gas analyses of the first complete JET cryopump regeneration with ITER-like wall

S. Grünhagen Romanelli, S. Brezinsek, B. Butler, J. P. Coad, A. Drenik, C. Giroud, S. Jachmich, T. Keenan, U. Kruezi, M. Mozetic, M. Oberkofler, A. Parracho, M. Romanelli, R. Smith, J. Yorkshades

Research output: Contribution to journalConference articlepeer-review

Abstract

Analytical results of a complete JET cryopump regeneration, including the nitrogen panel, following the first ITER-like wall campaign are presented along with the in situ analyses of residual gas. H/D mixtures and impurities such as nitrogen and neon were injected during plasma operation in the vessel to study radiation cooling in the scrape-off-layer and divertor region. The global gas inventory over the campaign is incomplete, suggesting residual volatile impurities are remaining on the cryogenic panel. This paper presents results on (i) residual deuterium on the panel which is very loosely related to the campaign, (ii) impurities like nitrogen which stick on the panel, and (iii) the ammonia production which can be observed by mass spectrometry.

Original languageEnglish
Article number014068
JournalPhysica Scripta
VolumeT159
DOIs
Publication statusPublished - 2014
Event14th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2013 - Julich, Germany
Duration: 13 May 201317 May 2013

Keywords

  • ITER-like wall
  • JET cryogenic pump
  • JET exhaust
  • RGA
  • gas chromatograph
  • regeneration

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