(IT/P1-22) First Mirrors for Diagnostic Systems of ITER

A. Litnovsky1), V. Voitsenya2)
1) Institut für Plasmaphysik, Forschungszentrum Jülich, Partner in the Trilateral Euregio Cluster, Association EURATOM-FZJ, Jülich, Germany
2)IPP, NSC Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine

Abstract.  About half of all diagnostics presently foreseen for ITER will use in-vessel mirrors as plasma-viewing components. Mirrors are used for observing the plasma radiation in a very wide wavelength range: from about 1 nm up to a few mm. In the hostile ITER environment, mirrors will be subject to erosion, deposition, particle implantation and other adverse effects which will change their optical characteristics affecting the entire performance of the respective diagnostic systems. The Specialists Working Group (SWG) on first mirrors was established under the wings of the International Tokamak Physics Activity Topical Group on Diagnostics to coordinate and guide the investigations on diagnostic mirrors towards the development of optimal, robust and durable solutions for ITER diagnostic systems. The results of tests of various ITER-candidate mirror materials, performed in Tore-Supra, TEXTOR, DIII-D, TCV, T-10 and LHD under various plasma conditions, an overview of laboratory investigations of mirror performance and mirror cleaning techniques along with the first modeling data on the optical characteristics of mirrors under plasma exposure will be presented in the paper. The current tasks in the R&D of diagnostic mirrors will be addressed.

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