@article{7221, author = {M. Rubel and J. P. Coad and G. De Temmerman and A. Hakola and D. Hole and J. Likonen and I. Uytdenhouwen and A. Widdowson}, title = {First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology}, 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 = {2010}, journal = {Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment}, volume = {623}, number = {2}, pages = {818-822}, month = {Nov}, isbn = {0168-9002}, url = {://000284343600044 }, note = {ISI Document Delivery No.: 681TVTimes Cited: 0Cited Reference Count: 24}, language = {English}, }