1. X-ray imaging crystal spectroscopy for use in plasma transport research.
- Author
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Reinke, M. L., Podpaly, Y. A., Bitter, M., Hutchinson, I. H., Rice, J. E., Delgado-Aparicio, L., Gao, C., Greenwald, M., Hill, K., Howard, N. T., Hubbard, A., Hughes, J. W., Pablant, N., White, A. E., and Wolfe, S. M.
- Subjects
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X-rays , *PLASMA gases , *SPECTRUM analysis , *MEASUREMENT errors , *UNCERTAINTY (Information theory) , *TOKAMAKS , *SURFACES (Physics) - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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