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

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.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ; ; ;  [2]
  1. MIT-Plasma Science and Fusion Center, Cambridge, Massachusetts 02139 (United States)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22093981
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALCATOR DEVICE; ASYMMETRY; CALIBRATION; CRYSTALS; DENSITY; DOPPLER BROADENING; ELECTRON TEMPERATURE; HEAT TRANSFER; ION TEMPERATURE; ITER TOKAMAK; MAGNETIC SURFACES; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA IMPURITIES; SIMULATION; SPECTROMETERS; SPECTROSCOPY; X RADIATION; X-RAY SOURCES

Citation Formats

Reinke, M. L., Podpaly, Y. A., Hutchinson, I. H., Rice, J. E., Gao, C., Greenwald, M., Howard, N. T., Hubbard, A., Hughes, J. W., White, A. E., Wolfe, S. M., Bitter, M., Delgado-Aparicio, L., Hill, K., and Pablant, N. X-ray imaging crystal spectroscopy for use in plasma transport research. United States: N. p., 2012. Web. doi:10.1063/1.4758281.
Reinke, M. L., Podpaly, Y. A., Hutchinson, I. H., Rice, J. E., Gao, C., Greenwald, M., Howard, N. T., Hubbard, A., Hughes, J. W., White, A. E., Wolfe, S. M., Bitter, M., Delgado-Aparicio, L., Hill, K., & Pablant, N. X-ray imaging crystal spectroscopy for use in plasma transport research. United States. doi:10.1063/1.4758281.
Reinke, M. L., Podpaly, Y. A., Hutchinson, I. H., Rice, J. E., Gao, C., Greenwald, M., Howard, N. T., Hubbard, A., Hughes, J. W., White, A. E., Wolfe, S. M., Bitter, M., Delgado-Aparicio, L., Hill, K., and Pablant, N. Thu . "X-ray imaging crystal spectroscopy for use in plasma transport research". United States. doi:10.1063/1.4758281.
@article{osti_22093981,
title = {X-ray imaging crystal spectroscopy for use in plasma transport research},
author = {Reinke, M. L. and Podpaly, Y. A. and Hutchinson, I. H. and Rice, J. E. and Gao, C. and Greenwald, M. and Howard, N. T. and Hubbard, A. and Hughes, J. W. and White, A. E. and Wolfe, S. M. and Bitter, M. and Delgado-Aparicio, L. and Hill, K. and Pablant, N.},
abstractNote = {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.},
doi = {10.1063/1.4758281},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 11,
volume = 83,
place = {United States},
year = {2012},
month = {11}
}