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

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

doi:10.1088/0031-8949/2014/T159/014068

Journal Article

FZJ-2014-06273

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

Grünhagen Romanelli, S. (Corresponding Author) ; Brezinsek, S.FZJ* ; Butler, B. ; Coad, J. P. ; Drenik, A. ; Giroud, C. ; Jachmich, S.FZJ* ; Keenan, T. ; Kruezi, U. ; Mozetic, M. ; Oberkofler, M. ; Parracho, A. ; Romanelli, M. ; Smith, R. ; Yorkshades, J.

2014
IoP Publ. Bristol

Physica scripta T159, 014068 (2014) [10.1088/0031-8949/2014/T159/014068]

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Please use a persistent id in citations: http://hdl.handle.net/2128/24456 doi:10.1088/0031-8949/2014/T159/014068

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.

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