In laser and optical methods of plasma diagnostics in ITER the most critical components of the measurementudschemes will be the First Mirrors (FM) facing the burning plasma and located rather close to plasma volume. It is veryudimportant to check regularly the working condition of FM surface in situ, e.g., to control the Quality of transmittedudImage (IQ) or signal. In the present work we compare the results of measurements of IQ made in situ, directly on theudplasma device DSM-2 during mirror exposure to ion bombardment, with a compact optical scheme in use, and theudresults of ex situ measurements (on the DIQ stand) – with two times longer distance to mirror (~2.5 meters).
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