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

Journal Article · Thu Nov 15 00:00:00 EST 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4758281· OSTI ID:22093981

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. ^[1]; Bitter, M.; Delgado-Aparicio, L.; Hill, K.; Pablant, N. ^[2]

---

1. MIT-Plasma Science and Fusion Center, Cambridge, Massachusetts 02139 (United States)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

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.

• OSTI ID: 22093981
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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