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Upper wide-angle viewing system for ITER

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Author: Lasnier, C.J. · McLean, A.G. · Gattuso, A. · O'Neill, R. · Smiley, M. · Vasquez, J. · Feder, R. · Smith, M. · Stratton, B. · Johnson, D. · Verlaan, A.L. · Heijmans, J.A.C.
Publisher: Lawrence Livermore National Laboratory
Place: Livermore, CA, USA
Source:21st Topical Conference on High-Temperature Plasma Diagnostics, 6-9 June 2016, Madison, WI, USA
Identifier: 572339
Article number: 822391 LLNL-CONF-694074
Keywords: Electronics · High Tech Systems & Materials · Industrial Innovation · Nano Technology · OPT - Optics OM - Opto-Mechatronics · TS - Technical Sciences


The Upper Wide Angle Viewing System (UWAVS) will be installed on five upper ports of ITER. This paper shows major requirements, gives an overview of the preliminary design with reasons for some design choices, examines self-emitted IR light from UWAVS optics and its effect on accuracy, and shows calculations of signal-to-noise ratios for the two-color temperature output as a function of integration time and divertor temperature. Accurate temperature output requires correction for vacuum window absorption vs. wavelength and for self-emitted IR, which requires good measurement of the temperature of the optical components. The anticipated signal-to-noise ratio using presently available IR cameras is adequate for the required 500 Hz frame rate.