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Title: On the scattering correction of fast-ion D-alpha signals on NSTX-U

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. Here, one method uses laboratory measurements with a calibration lamp; the other method uses data acquired during plasma operation and singular value decomposition analysis. Finally, after correction, both the FIDA spectra and spatial profile are in better agreement with theoretical predictions.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [2] ; ORCiD logo [2]
  1. Univ. of California, Irvine, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
AC02-09CH11466; FG02-06ER54867; FG03-02ER54681; FG02- 06ER54867
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 6; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1467888
Alternate Identifier(s):
OSTI ID: 1454658

Hao, G. Z., Heidbrink, W. W., Liu, D., Stagner, L., Podestà, M., and Bortolon, A.. On the scattering correction of fast-ion D-alpha signals on NSTX-U. United States: N. p., Web. doi:10.1063/1.5031879.
Hao, G. Z., Heidbrink, W. W., Liu, D., Stagner, L., Podestà, M., & Bortolon, A.. On the scattering correction of fast-ion D-alpha signals on NSTX-U. United States. doi:10.1063/1.5031879.
Hao, G. Z., Heidbrink, W. W., Liu, D., Stagner, L., Podestà, M., and Bortolon, A.. 2018. "On the scattering correction of fast-ion D-alpha signals on NSTX-U". United States. doi:10.1063/1.5031879.
@article{osti_1467888,
title = {On the scattering correction of fast-ion D-alpha signals on NSTX-U},
author = {Hao, G. Z. and Heidbrink, W. W. and Liu, D. and Stagner, L. and Podestà, M. and Bortolon, A.},
abstractNote = {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. Here, one method uses laboratory measurements with a calibration lamp; the other method uses data acquired during plasma operation and singular value decomposition analysis. Finally, after correction, both the FIDA spectra and spatial profile are in better agreement with theoretical predictions.},
doi = {10.1063/1.5031879},
journal = {Review of Scientific Instruments},
number = 6,
volume = 89,
place = {United States},
year = {2018},
month = {6}
}