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X-ray imaging crystal spectroscopy for use in plasma transport research

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15 Author(s)
Reinke, M.L. ; MIT-Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA ; Podpaly, Y.A. ; Bitter, M. ; Hutchinson, I.H.
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This research describes advancements in the spectral analysis and error propagation techniques associated with x-ray imaging crystal spectroscopy (XICS) that have enabled this diagnostic to be used to accurately constrain particle, momentum, and heat transport studies in a tokamak for the first time. Doppler tomography techniques have been extended to include propagation of statistical uncertainty due to photon noise, the effect of non-uniform instrumental broadening as well as flux surface variations in impurity density. These methods have been deployed as a suite of modeling and analysis tools, written in interactive data language (IDL) and designed for general use on tokamaks. Its application to the Alcator C-Mod XICS is discussed, along with novel spectral and spatial calibration techniques. Example ion temperature and radial electric field profiles from recent I-mode plasmas are shown, and the impact of poloidally asymmetric impurity density and natural line broadening is discussed in the context of the planned ITER x-ray crystal spectrometer.

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Review of Scientific Instruments  (Volume:83 ,  Issue: 11 )