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Material deposition on inner divertor quartz-micro balances during ITER-like wall operation in JET
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2015 (engelsk)Inngår i: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 463, s. 796-799Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2015. Vol. 463, s. 796-799
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URN: urn:nbn:se:kth:diva-172695DOI: 10.1016/j.jnucmat.2015.01.021ISI: 000358467200169Scopus ID: 2-s2.0-84937737180OAI: oai:DiVA.org:kth-172695DiVA, id: diva2:850188
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QC 20150901

Tilgjengelig fra: 2015-09-01 Laget: 2015-08-27 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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