2007•Bulletin of the American Physical SocietyRequires access
Inference of Ion-Temperature and Rotation-Velocity Profiles from a Spatially Resolving X-Ray Crystal Spectrometer on Alcator C-Mod
K.W. Hill, M. Bitter, P. Beiersdörfer, A. Ince-Cushman, Ming-Feng Gu, S.G. Lee, M.L. Reinke, J. E. Rice, S. D. Scott
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Abstract
A new x-ray crystal spectrometer capable of providing spatially (~1.5 cm) and temporally (~10 ms) resolved, high resolution spectra of He-like Ar Kα lines has been installed on Alcator C-Mod. The imaging spectrometer consists of a spherically bent crystal and three Pilatus II 2d pixel detectors. Spectra are simultaneously measured from 12 – 45 chords covering the region r/a = 0 0.8 with count rates of 0.1 – 5.0 MHz per chord, enabling measurement with good statistics. Preliminary ion-temperature (Ti) and rotation-velocity (vφ) profiles are inferred from the Doppler widths and shifts of the chordally integrated spectral lines. The data analysis techniques, Ti and vφ profile results, analysis of background resulting from fusion neutrons, and predictions of performance on ITER and other tokamaks will be presented. Research supported by U.S. DOE contract DE-AC02-76-CH03073