Abstract
For passive and active optical plasma diagnostics mirrors are needed at the vessel walls. However, all surface layers of plasma exposed surfaces have been found to be modified by erosion, redeposition and hydrogen implantation from the plasma [1]. These modifications will generally decrease the reflectivity of the surfaces [2] and frequent recalibration of the diagnostics are necessary. They may even result in damage of the mirrors, for example in the case of high power laser pulses.
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Mayer, M., Behrisch, R., Gowers, C., Andrew, P., Peacock, A.T. (1998). Change of the Optical Reflectivity of Mirror Surfaces Exposed to Jet Plasmas. In: Stott, P.E., Gorini, G., Prandoni, P., Sindoni, E. (eds) Diagnostics for Experimental Thermonuclear Fusion Reactors 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5353-3_33
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