In the ITER Core Plasma Thomson Scattering, the scattered light collection optics system is installed both inside and outside the diagnostic port under vacuum. The length of the optical path (∼6 m) and the need to shield the neutron and γ radiation increased the complexity of the system with the inclusion of multiple dog-legs, forcing the use of many elements with optical power. Multiple rounds of design have been required in order to satisfy iteratively the system requirements in terms of resolution, aberration, and shielding. The adoption of quasi-free-form reflective surfaces for several mirrors eventually allowed the correct compromise between all conflicting requirements.

ITER Project
, ITER Project Requirements (PR) Version 5.3, private communication (
April 2014
ITER Project
, ITER System Requirements Documents for diagnostics (SRD-55) Version 4.0, private communication (
Janaury 2015
), CodeV® and Zemax® are the software packages used for the design.
You do not currently have access to this content.