On the scattering correction of fast-ion D-alpha signal on NSTX-U

Dataset · Fri Jun 01 00:00:00 EDT 2018

DOI:https://doi.org/10.11578/1562065· OSTI ID:1562065

Hao, G Z ^[1]; Heidbrink, W W; Liu, D; Stagner, L; Podesta, M; Bortolon, A

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1. OSTI

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.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: U. S. Department of Energy
• DOE Contract Number: AC02-09CH11466
• OSTI ID: 1562065
• Country of Publication: United States
• Language: English

Related Subjects

Single value decomposition (SVD)