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First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.ORCID iD: 0000-0001-9901-6296
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2010 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 623, no 2, 818-822 p.Article in journal (Refereed) Published
Abstract [en]

Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits' disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, lambda similar to 5-7 mm.

Place, publisher, year, edition, pages
Elsevier, 2010. Vol. 623, no 2, 818-822 p.
Keyword [en]
Diagnostic mirrors, Surface analysis, Reflectivity, Erosion and deposition, JET, ITER
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-27665DOI: 10.1016/j.nima.2010.01.069ISI: 000284343600044Scopus ID: 2-s2.0-77957932904OAI: oai:DiVA.org:kth-27665DiVA: diva2:381233
Conference
1st International Conference on Frontiers in Diagnostic Technologies
Note
QC 20101223Available from: 2012-01-26 Created: 2010-12-20 Last updated: 2017-12-11Bibliographically approved

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Rubel, Marek

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Fusion Plasma PhysicsAlfvén Laboratory Centre for Space and Fusion Plasma Physics
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Atom and Molecular Physics and Optics

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