Effect of graphite and molybdenum wall tile reflections on visible light diagnostics in tokamak experiments (original) (raw)

Review of Scientific Instruments, 2003

Abstract

Visible light reflectivities are measured for graphite and molybdenum tokamak wall tiles as a function of incident angle and wavelength. Using the measured reflectivities together with a ray-tracing routine, estimates of the effect of wall reflections on Dα light measurements in the DIII-D and Alcator C-Mod tokamaks are made. It is found that the contribution of reflections is small (typically <10%) for divertor view channels, but can be significant (>50%) for other view chords. Of the nondivertor channels, near-midplane view chords are found to be least susceptible to reflections from the divertor and are therefore best suited for main chamber recycling measurements.

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