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Plasma impact on diagnostic mirrors in JET

Authors :
Garcia-Carrasco, A.
Andersson Sundén, Erik
Asp, E.
Binda, Federico
Cecconello, Marco
Conroy, Sean
Dzysiuk, Nataliia
Ericsson, Göran
Eriksson, Jacob
Hellesen, Carl
Hjalmarsson, Anders
Possnert, Göran
Sjöstrand, Henrik
Skiba, Mateusz
Weiszflog, Matthias
Zychor, I.
Garcia-Carrasco, A.
Andersson Sundén, Erik
Asp, E.
Binda, Federico
Cecconello, Marco
Conroy, Sean
Dzysiuk, Nataliia
Ericsson, Göran
Eriksson, Jacob
Hellesen, Carl
Hjalmarsson, Anders
Possnert, Göran
Sjöstrand, Henrik
Skiba, Mateusz
Weiszflog, Matthias
Zychor, I.
Publication Year :
2017

Abstract

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

Details

Database :
OAIster
Notes :
application/pdf, English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1235237622
Document Type :
Electronic Resource
Full Text :
https://doi.org/10.1016.j.nme.2016.12.032