NIFS-463

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Author(s):

V. Voitsenya, V. Konovalov, O. Motojima, K. Narihara, M. Becker and B. Schunke

Title:

Evaluations of Different Metals for Manufacturing Mirrors of Thomson Scattering System for the LHD Divertor Plasma

Date of publication:

Nov. 1996

Key words:

metal mirror, Thomson scattering, charge exchange, laser induced damage, Large Helical Device

Abstract:

We compared various metals which is to be used as Thomson-scattering-laser-guiding mirrors in the Large Helical Device (LHD) plasma, in views of reflectivity, resistance to the long-term sputtering by low energy charge exchange atoms and to multi-shot laser-induced damage. Gold and rhodium mirrors, which are superior in high resistance to sputtering of charge exchange atoms and in high reflectivity, will be destroyed in 10^4 LHD-plasma shots; molybdenum, which is inferior to gold and rhodium in the sputtering resistance and reflectivity, will survive up to 10^6 LHD-plasma shots

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