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

Hao, G. Z.; Heidbrink, W. W.; Liu, D. ; Stagner, L. ; Podesta, M. ; Bortolon, A.
Issue date: 2018
Rights:
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Hao, G. Z., Heidbrink, W. W., Liu, D., Stagner, L., Podesta, M., & Bortolon, A. (2018). On the scattering correction of fast-ion D-alpha signal on NSTX-U [Data set]. Princeton Plasma Physics Laboratory, Princeton University. https://doi.org/10.11578/1562065
@electronic{hao_g_z_2018,
  author      = {Hao, G. Z. and
                Heidbrink, W. W. and
                Liu, D. and
                Stagner, L. and
                Podesta, M. and
                Bortolon, A.},
  title       = {{On the scattering correction of fast-ion
                 D-alpha signal on NSTX-U}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2018,
  url         = {https://doi.org/10.11578/1562065}
}
Description:

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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