A spatially resolving x-ray crystal spectrometer for measurement of ion-temperature and rotation-velocity profiles on the Alcator C-Mod tokamak
- PPPL, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States)
- PSFC, MIT, Cambridge, Massachusetts 02139 (United States)
- LLNL, Livermore, California 94550 (United States)
- National Fusion Research Institute, Taejeon 305-333 (Korea, Republic of)
- DECTRIS Ltd., CH-5232 Villigen-PSI (Switzerland)
A new spatially resolving x-ray crystal spectrometer capable of measuring continuous spatial profiles of high resolution spectra ({lambda}/d{lambda}>6000) of He-like and H-like Ar K{alpha} lines with good spatial ({approx}1 cm) and temporal ({approx}10 ms) resolutions has been installed on the Alcator C-Mod tokamak. Two spherically bent crystals image the spectra onto four two-dimensional Pilatus II pixel detectors. Tomographic inversion enables inference of local line emissivity, ion temperature (T{sub i}), and toroidal plasma rotation velocity (v{sub {phi}}) from the line Doppler widths and shifts. The data analysis techniques, T{sub i} and v{sub {phi}} profiles, analysis of fusion-neutron background, and predictions of performance on other tokamaks, including ITER, will be presented.
- OSTI ID:
- 21266485
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 79; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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