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Plasma impact on diagnostic mirrors in JET
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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Number of Authors: 11132017 (English)In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 12, p. 506-512Article in journal (Refereed) Published
Abstract [en]

Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. This contribution provides a comprehensive account on plasma impact on diagnostic mirrors in JET with the ITER-Like Wall. Specimens from the First Mirror Test and the lithium-beam diagnostic have been studied by spectrophotometry, ion beam analysis and electron microscopy. Test mirrors made of molybdenum were retrieved from the main chamber and the divertor after exposure to the 2013-2014 experimental campaign. In the main chamber, only mirrors located at the entrance of the carrier lost reflectivity (Be deposition), while those located deeper in the carrier were only slightly affected. The performance of mirrors in the JET divertor was strongly degraded by deposition of beryllium, tungsten and other species. Mirrors from the lithium-beam diagnostic have been studied for the first time. Gold coatings were severely damaged by intense arcing. As a consequence, material mixing of the gold layer with the stainless steel substrate occurred. Total reflectivity dropped from over 90% to less than 60%, i.e. to the level typical for stainless steel. (C) 2017 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

Place, publisher, year, edition, pages
ELSEVIER , 2017. Vol. 12, p. 506-512
Keywords [en]
JET, First mirror test, Diagnostic mirrors, Erosion-deposition
National Category
Fusion, Plasma and Space Physics Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-398914DOI: 10.1016/j.nme.2016.12.032ISI: 000417293300079OAI: oai:DiVA.org:uu-398914DiVA, id: diva2:1379707
Funder
Swedish Research Council, 621-2012-4148Swedish Research Council, 2015-04844
Note

For complete list of authors see http://dx.doi.org/10.1016/j.nme.2016.12.032

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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Andersson Sundén, ErikBinda, FedericoCecconello, MarcoConroy, SeanDzysiuk, NataliiaEricsson, GöranEriksson, JacobHellesen, CarlHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikSkiba, MateuszWeiszflog, Matthias
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