Material deposition on inner divertor quartz-micro balances during ITER-like wall operation in JET
2015 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 463, 796-799 p.Article in journal (Refereed) Published
The migration of beryllium, tungsten and carbon to remote areas of the inner JET-ILW divertor and the accompanying co-deposition of deuterium has been investigated using post-mortem analysis of the housings of quartz-micro balances (QMBs) and their quartz crystals. The analysis of the deposition provides that the rate of beryllium atoms is significantly reduced compared to the analogue deposition rate of carbon during the carbon wall conditions (JET-C) at the same locations of the QMBs. A reduction factor of 50 was found at the entrance gap to the cryo-pumps while it was 14 under tile 5, the semi-horizontal target plate. The deposits consist of C/Be atomic ratios of typically 0.1-0.5 showing an enrichment of carbon in remote areas compared to directly exposed areas with less carbon. The deuterium retention fraction D/Be is between 0.3 and 1 at these unheated locations in the divertor.
Place, publisher, year, edition, pages
2015. Vol. 463, 796-799 p.
IdentifiersURN: urn:nbn:se:kth:diva-172695DOI: 10.1016/j.jnucmat.2015.01.021ISI: 000358467200169ScopusID: 2-s2.0-84937737180OAI: oai:DiVA.org:kth-172695DiVA: diva2:850188
QC 201509012015-09-012015-08-272015-09-01Bibliographically approved