First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology
2010 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 623, no 2, 818-822 p.Article in journal (Refereed) Published
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.
Diagnostic mirrors, Surface analysis, Reflectivity, Erosion and deposition, JET, ITER
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-27665DOI: 10.1016/j.nima.2010.01.069ISI: 000284343600044ScopusID: 2-s2.0-77957932904OAI: oai:DiVA.org:kth-27665DiVA: diva2:381233
1st International Conference on Frontiers in Diagnostic Technologies
QC 201012232012-01-262010-12-202012-02-22Bibliographically approved