1. Application to the VIS/IR Imaging System of ITER
Cameras in ITER: 18 views in the VIS and IR range needed to cover 80 % of the inner vacuum chamber of ITER
Mandatory diagnostic for the ITER machine protection
Used for monitoring in real time the Plasma Facing Components (PFCs) heating (200°C-3600°C)
Strong issues to get accurate surface temperature measurements of PFCs in highly reflective environment
Measured flux
Issues in future metallic tokamak (ITER)
Low and changing emissivities  (λ, T, surface properties)
Multiple reflections adding parasitic signals =
Target
camera
ελ’Lλ(Tsurf)
(1-ελ’)Lλ(To)
Thermal Emission
Reflection To
(Blackbody)
Cause major errors in the surface temperature measurement Tsurf
A realistic photonic simulation necessary to quantify accurately the contribution of the reflected flux on the surface temperature measurement
20th ITPA Topical Group Meeting on Diagnostics
25th May, 2011