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

Author
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.

Year of Publication
2010
Journal
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment
Volume
623
Number
2
Number of Pages
818-822
Date Published
Nov
Type of Article
Proceedings Paper
ISBN Number
0168-9002
Accession Number
ISI:000284343600044
URL
<Go to ISI>://000284343600044
PId
60047b73ef3d7a6a5485ae596af15a76
Alternate Journal
Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip.
Journal Article
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