A spatially resolving x-ray crystal spectrometer for measurement of ion-temperature and rotation-velocity profiles on the Alcator C-Mod tokamak

Hill, K. W.; Bitter, M. L.; Scott, S. D.; Ince-Cushman, A.; Reinke, M.; Rice, J. E.; Beiersdorfer, P.; Gu, M.-F.; Lee, S. G.; Broennimann, Ch.; Eikenberry, E. F.
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10E320
Academic Journal
A new spatially resolving x-ray crystal spectrometer capable of measuring continuous spatial profiles of high resolution spectra (λ/dλ>6000) of He-like and H-like Ar Kα lines with good spatial (∼1 cm) and temporal (∼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 (Ti), and toroidal plasma rotation velocity (v[lowercase_phi_synonym]) from the line Doppler widths and shifts. The data analysis techniques, Ti and v[lowercase_phi_synonym] profiles, analysis of fusion-neutron background, and predictions of performance on other tokamaks, including ITER, will be presented.


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