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Title: On the scattering correction of fast-ion D-alpha signal on NSTX-U
Contributors: Hao, G.Z
Heidbrink, W.W.
Liu, D.
Stagner, L.
Podesta, M.
Bortolon, A.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: NSTX-U
FIDA diagnostic
Scattering correction
Single value decomposition (SVD)
Issue Date: Jun-2018
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Review of Scientific Instruments vol. 89 p. 063507 (June 2018)
Abstract: Analysis of fast-ion D-alpha (FIDA) data on National Spherical Torus Experiment-Upgrade (NSTX-U) shows that the cold Dα line contaminates the FIDA baseline. The scattered light is comparable to the FIDA emission. A scattering correction is required to extract the FIDA signal. Two methods that relate the scattered light contamination to the intensity of the cold Dα line are employed. One method uses laboratory measurements with a calibration lamp; the other method uses data acquired during plasma operation and singular value decomposition analysis. After correction, both the FIDA spectra and spatial profile are in better agreement with theoretical predictions.
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Appears in Collections:NSTX-U

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