Bidirectional reflectance measurement of tungsten samples to assess reflection model in WEST tokamak

Ben Yaala, M. and Aumeunier, M.-H. and Steiner, R. and Schönenberger, M. and Martin, C. and Le Bohec, M. and Talatizi, C. and Marot, L. and Meyer, E. (2021) Bidirectional reflectance measurement of tungsten samples to assess reflection model in WEST tokamak. Review of Scientific Instruments, 92 (9). 093501. ISSN 0034-6748

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    Abstract

    This paper presents the measurement of the bidirectional reflectance distribution function of tungsten (W) samples and the resulting reflection models in the nuclear fusion device WEST (tokamak). For this, an experimental gonio-spectrophotometer was developed to fully characterize the material’s optical and thermal-radiative properties of metallic samples with different roughnesses. Ray-tracing photonic simulation was then carried out to predict the photon behavior in a fully metallic environment as a function of reflectance measurement. Low emissivity (0.1 at 4 μm) and highly specular reflectance (fitting with a Gaussian distribution around the specular direction with a small width lower than 10°) are found for W samples. These measurements have been used as input for the photonic simulation, and the resulting synthetic image reproduced the reflection features well on the upper divertor, detected in WEST infrared experimental images.