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Bidirectional reflectance distribution function of recrystallized tungsten mono-block exposed to cyclic heat loading
The bidirectional reflectance distribution function (BRDF) of recrystallized tungsten mono-blocks exposed to cyclic heat loading for ITER divertor outer vertical target was measured using a goniophotometer at a wavelength of 473 nm. Laser microscope observations revealed that the surface roughness of the mono-block increased by an order of magnitude after cyclic heat loads of approximately 20 MWm−2. Furthermore, the overall values of BRDF decreased with an increase in cyclic heat loading. A comparison between the modeled and measured BRDFs showed that an additional Lambertian component is necessary to a specular function (microfacet model or Gaussian function) to fit the measured BRDFs when the surface of the mono-blocks becomes rough.
Bidirectional reflectance distribution function of recrystallized tungsten mono-block exposed to cyclic heat loading
The bidirectional reflectance distribution function (BRDF) of recrystallized tungsten mono-blocks exposed to cyclic heat loading for ITER divertor outer vertical target was measured using a goniophotometer at a wavelength of 473 nm. Laser microscope observations revealed that the surface roughness of the mono-block increased by an order of magnitude after cyclic heat loads of approximately 20 MWm−2. Furthermore, the overall values of BRDF decreased with an increase in cyclic heat loading. A comparison between the modeled and measured BRDFs showed that an additional Lambertian component is necessary to a specular function (microfacet model or Gaussian function) to fit the measured BRDFs when the surface of the mono-blocks becomes rough.
Bidirectional reflectance distribution function of recrystallized tungsten mono-block exposed to cyclic heat loading
Hiroki Natsume (author) / Kunpei Nojiri (author) / Shin Kajita (author) / Makoto Fukuda (author) / Tomohiko Ushiki (author) / Hirohiko Tanaka (author) / Tatsuo Sugie (author) / Sin-iti Kitazawa (author) / Takanori Kikuchi (author) / Tomohiro Yokozuka (author)
2022
Article (Journal)
Electronic Resource
Unknown
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