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