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- W2890875574 abstract "A new calibration method for the DIII-D charge-exchange spectroscopy system produces a smoother impurity density profile compared to previous techniques, improving the accuracy of the impurity density profile reconstruction. The relative intensity calibration between the chords of the DIII-D charge-exchange recombination spectroscopy system is performed by firing neutral beams into the evacuated vacuum vessel pre-filled with neutral gas. Relative calibration is required in order to account for uncertainty in the 3D geometry of the neutral beam. Previous methods using helium gas have been improved by using xenon, which emits an emission line close to the commonly used carbon wavelength 5290.5 Å, as well as improved timing of the gas injection, inclusion of variations in the vessel pressure, and timing of neutral beam injection. Photoemission spectra recorded by 112 sightlines viewing 6 neutral beams are compared and used to form a relative calibration factor for each sightline. This relative calibration is shown to improve the quality of the measured ion density profile." @default.
- W2890875574 created "2018-09-27" @default.
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- W2890875574 date "2018-09-14" @default.
- W2890875574 modified "2023-10-06" @default.
- W2890875574 title "Relative intensity calibration of the DIII-D charge-exchange recombination spectroscopy system using neutral beam injection into gas" @default.
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- W2890875574 doi "https://doi.org/10.1063/1.5037333" @default.
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