Development of a spatially resolving x-ray crystal spectrometer for measurement of ion-temperature (T{sub i}) and rotation-velocity (v) profiles in ITER
- Princeton Plasma Physics Laboratory, P.O. Box 451 MS 15, Princeton, New Jersey 08543 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- MIT Plasma Science and Fusion Center, 190 Albany Street, Cambridge, Massachusetts 02139 (United States)
- ITER Cadarache JWS, Cadarache Centre, 13108 St Paul-Les-Durance (France)
- Department of Physics, University of Strathclyde, Glasgow G4 0NG (United Kingdom)
- National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
Imaging x-ray crystal spectrometer (XCS) arrays are being developed as a US-ITER activity for Doppler measurement of T{sub i} and v profiles of impurities (W, Kr, and Fe) with {approx}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{sub 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.
- OSTI ID:
- 22055875
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Development of a Spatially Resolving X-Ray Crystal Spectrometer (XCS) for Measurement of Ion-Temperature (Ti) and Rotation-Velocity (v) Profiles in ITER
A spatially resolving x-ray crystal spectrometer for measurement of ion-temperature and rotation-velocity profiles on the Alcator C-Mod tokamak