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.
Design of the collection optics for the Core Plasma Thomson Scattering (CPTS) in ITER
Note: Paper published as part of the Proceedings of the 22nd Topical Conference on High-Temperature Plasma Diagnostics, San Diego, California, April 2018.
M. Bassan, R. Huxford, B. Crowther, R. Scannell, G. Vayakis, M. Walsh; Design of the collection optics for the Core Plasma Thomson Scattering (CPTS) in ITER. Rev. Sci. Instrum. 1 October 2018; 89 (10): 10C112. https://doi.org/10.1063/1.5036784
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