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Spectroscopic reflectometry of mirror surfaces during plasma exposure
1Department of Physics, University of Basel, Basel, Switzerland. marco.wisse@unibas.ch
Abstract:
An in situ spectroscopic reflectometry system has been built to investigate the evolution of the specular reflectivity spectrum of ITER first mirror samples during plasma exposure. Results are presented for three different types of molybdenum mirror samples that were exposed to deuterium plasma, including single crystalline, nanocrystalline, and polycrystalline molybdenum. The results show good agreement with ex situ measurements of the reflectivity spectrum before and after exposure and extend the results obtained in previous experiments.
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