Optical design of a dual wave band catadioptric endoscope for the Joint European Torus
Authors: Greco V., Maddaluno G.
Autors Affiliation: Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy; Associazione ENEA-EURATOM sulla Fusione, Via Enrico Fermi 45, 00044 Frascati, Roma, Italy
Abstract: In. this paper we describe the optical design of a catadioptric endoscope for the Joint European Torus (JET). The JET is the flagship experiment in the European nuclear fusion research programme. It is a large tokamak (Russian acronym for \”toroidal magnetic chamber\”) system located at Culham (UK). At the centre of this machine there is a toroidal (ring shaped) vacuum vessel where the plasma is confined by magnetic fields. The endoscope explores in two wave bands (4.2 mum – 4.4 mum and 0.6 mum – 0.7 mum) an entire cross section of the vacuum vessel. It then creates for each wave band an image onto a separate area image sensor, located 5500 mm away from the plasma behind a concrete shield. The endoscope performs two different functions namely: infrared thermography on plasma facing components and in vessel inspection.
Journal/Review: PROCEEDINGS OF SPIE
Volume: 5249 Pages from: 668 to: 677