Hill K W, Bitter M, Delgado-Aparicio L, Johnson D, Feder R, Beiersdorfer P, Dunn J, Morris K, Wang E, Reinke M, Podpaly Y, Rice J E, Barnsley R, O'Mullane M, Lee S G
Princeton Plasma Physics Laboratory, P.O. Box 451 MS 15, Princeton, New Jersey 08543, USA.
Rev Sci Instrum. 2010 Oct;81(10):10E322. doi: 10.1063/1.3492414.
Imaging x-ray crystal spectrometer (XCS) arrays are being developed as a US-ITER activity for Doppler measurement of T(i) 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 T(i) 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.
