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

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  • ASDEX Upgrade Team
  • JET contributors
  • MAST-Upgrade Team
  • EUROFusion MST1 Team

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Publication details

JournalThe Review of scientific instruments
DateAccepted/In press - 29 Mar 2019
DatePublished (current) - 19 Apr 2019
Issue number4
Volume90
Number of pages12
Pages (from-to)043504
Original languageEnglish

Abstract

Ray-tracing techniques are applied to filtered divertor imaging, a diagnostic that has long suffered from artifacts due to the polluting effect of reflected light in metal walled fusion machines. Physically realistic surface reflections were modeled using a Cook-Torrance micro-facet bi-directional reflection distribution function applied to a high resolution mesh of the vessel geometry. In the absence of gonioreflectometer measurements, a technique was developed to fit the free parameters of the Cook-Torrance model against images of the JET in-vessel light sources. By coupling this model with high fidelity plasma fluid simulations, photo-realistic renderings of a number of tokamak plasma emission scenarios were generated. Finally, a sensitivity matrix describing the optical coupling of a JET divertor camera and the emission profile of the plasma was obtained, including full reflection effects. These matrices are used to perform inversions on measured data and shown to reduce the level of artifacts in inverted emission profiles.

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