Mirror Test for ITER: Optical Characterisation of Metal Mirrors in Divertor Tokamaks

All optical systems in ITER will be based on metallic mirrors. The mirrors, as plasma-facing components, may undergo erosion and re-deposition processes [1] which may influence their optical properties, i.e. reflectivity, which would have a negative impact on spectroscopy signals [2,3]. Tests of first mirrors have therefore been initiated at several machines [4-6], including JET [4] and TCV where dedicated programme has been performed in which small mirror samples are exposed to a variety of divertor plasma configurations. The aim of this paper is to give a brief overview of the tests planned at JET and the experiments underway on TCV.
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