Physically principled reflection models applied to filtered camera imaging inversions in metal walled fusion machines

Physically principled reflection models applied to filtered camera imaging inversions in metal walled fusion machines

Physically principled reflection models applied to filtered camera imaging inversions in metal walled fusion machines 150 150 UKAEA Opendata

Ray-tracing techniques are applied to divertor filtered imaging, a diagnostic that has long been plagued by polluting reflected light features in metal walled fusion machines. A physically realistic surface reflection model is developed from a Cook-Torrence microfacet BRDF model. Camera calibration images of in-vessel point lights at JET are used to fit and benchmark the first wall material model. Forward models of the calibration images were rendered with the fitted BRDF models and good qualitative and quantitative agreement was obtained. Photo-realistic renderings of a number of tokamak plasma emission scenarios are presented by coupling the first wall model with high fidelity plasma fluid simulations. Finally, a ray-traced set of sensitivity matrices are produced for a JET divertor camera that includes reflection effects. These matrices are used to perform inversions on measured data and shown to be relatively artifact free.

Collection:
Journals
Journal:
Review of Scientific Instruments
Publisher:
AIP (American Institute of Physics)
Published date:
01/03/2021