title: Upper wide-angle viewing system for ITER.
abstract: 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.
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Lasnier
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA.
authors.forename: A G
authors.initials: AG
authors.lastname: McLean
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: A
authors.initials: A
authors.lastname: Gattuso
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: R
authors.initials: R
authors.lastname: O'Neill
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: M
authors.initials: M
authors.lastname: Smiley
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: J
authors.initials: J
authors.lastname: Vasquez
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: R
authors.initials: R
authors.lastname: Feder
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: M
authors.initials: M
authors.lastname: Smith
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: B
authors.initials: B
authors.lastname: Stratton
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: D
authors.initials: D
authors.lastname: Johnson
authors.affiliation: TNO, P.O. Box 155, NL-2600 AD Delft, Netherlands.
authors.forename: A L
authors.initials: AL
authors.lastname: Verlaan
authors.affiliation: TNO, P.O. Box 155, NL-2600 AD Delft, Netherlands.
authors.forename: J A C
authors.initials: JA
authors.lastname: Heijmans