Application to the VIS/IR Imaging System of ITER

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 (200C-3600C)

• 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 ? (?, T, surface
  properties)
• Multiple reflections adding parasitic signals

Target
camera
e?L?(Tsurf)
(1-e?)L?(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