Development Of a Spatially Resolving X-ray Crystal Spectrometer For Measurement Of Ion-temperature (Ti) And Rotation-velocity (v) Profiles in ITER
Authors: K. W. Hill, M. Bitter, L. Delgado-Aparicio, D. Johnson, R. Feder, P. Beiersdorfer, J. Dunn, K. Morris, E. Wang, M. Reinke, Y. Podpaly, J. E. Rice, R. Barnsley, M. O'Mullane, and S. G. Lee
Abstract: Imaging x-ray crystal spectrometer XCS arrays are being developed as a US-ITER activity for
Doppler measurement of Ti and v profiles of impurities (W, Kr, and Fe) with ~7 cm (a/30) and 10-100 ms resolution in ITER. The imaging XCS, modeled after a prototype instrument on Alcator
C-Mod, uses a spherically bent crystal and 2D x-ray detectors to achieve high spectral resolving power (E / dE >6000) horizontally and spatial imaging vertically. Two arrays will measure Ti and
both poloidal and toroidal rotation velocity profiles. The measurement of many spatial chords permits tomographic inversion for the inference of local parameters. The instrument design,
predictions of performance, and results from C-Mod are presented.
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Submitted to: Review of Scientific Instruments (May 2010)
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