title: Bragg x-ray survey spectrometer for ITER.
abstract: Several potential impurity ions in the ITER plasmas will lead to loss of confined energy through line and continuum emission. For real time monitoring of impurities, a seven channel Bragg x-ray spectrometer (XRCS survey) is considered. This paper presents design and analysis of the spectrometer, including x-ray tracing by the Shadow-XOP code, sensitivity calculations for reference H-mode plasma and neutronics assessment. The XRCS survey performance analysis shows that the ITER measurement requirements of impurity monitoring in 10 ms integration time at the minimum levels for low-Z to high-Z impurity ions can largely be met.
authors.affiliation: ITER-India, Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Varshney
authors.forename: R
authors.initials: R
authors.lastname: Barnsley
authors.forename: M G
authors.initials: MG
authors.lastname: O'Mullane
authors.forename: S
authors.initials: S
authors.lastname: Jakhar