First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology

TitleFirst Mirrors Test in JET for ITER: An overview of optical performance and surface morphology
Publication TypeJournal Article
Year of Publication2010
AuthorsM. Rubel, J.P Coad, G. De Temmerman, A. Hakola, D. Hole, J. Likonen, I. Uytdenhouwen, A. Widdowson
JournalNuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment
Volume623
Number2
Pagination818-822
Date PublishedNov
Type of ArticleProceedings Paper
ISBN Number0168-9002
Accession NumberISI:000284343600044
Keywordsberyllium, CARBON, CO-DEPOSITED, CONTROLLED FUSION DEVICES, DEPOSITION, DIAGNOSTIC MIRRORS, divertor, EROSION, Erosion and, FUEL INVENTORY, ITER, JET, LAYERS, OPERATION, Plasma-facing components, REFLECTIVITY, Surface analysis, WALL COMPONENTS
Abstract

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. (C) 2010 OCNL - Operating Company. Published by Elsevier B.V. All rights reserved.

URL<Go to ISI>://000284343600044
Division

PSI

PID

60047b73ef3d7a6a5485ae596af15a76

Alternate TitleNucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip.

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