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

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. 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:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1467888
Alternate Identifier(s):
OSTI ID: 1454658
Grant/Contract Number:  
AC02-09CH11466; FG02-06ER54867; FG03-02ER54681; FG02- 06ER54867
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

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., 2018. Web. https://doi.org/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. https://doi.org/10.1063/1.5031879
Hao, G. Z., Heidbrink, W. W., Liu, D., Stagner, L., Podestà, M., and Bortolon, A.. Mon . "On the scattering correction of fast-ion D-alpha signals on NSTX-U". United States. https://doi.org/10.1063/1.5031879. https://www.osti.gov/servlets/purl/1467888.
@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}
}

Journal Article:
Free Publicly Available Full Text
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Figures / Tables:

FIG. 1 FIG. 1: (a) Elevation and (b) plan view of the LOS of FIDA diagnostics. In (a), dashed and solid curves are the LOS of v/t-FIDA active view, respectively. The red solid point denotes the strike point of the plasma on the passive plate. In (b), symbols denote the v-FIDA LOS,more » while the solid curves label t-FIDA LOS. Red and blue denote the active view and reference view, respectively. T-FIDA active and reference views are tilted downward (a). The green line shows the centerline of the beam source NBI1C which is used as the diagnostic beam for FIDA spectra in this study. (c) The major radii where active (red) and reference (blue) LOS intercept the vessel versus fiber position for v-FIDA. Here, the fiber position is defined as the major radius where the LOS intercepts the beam line at the midplane. For example, for the fiber at R= 99 cm, the major radii where active and reference LOS intercept the divertor are 72.8 and 81 cm, respectively.« less

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  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562065

    Works referencing / citing this record:

    On the scattering correction of fast-ion D-alpha signal on NSTX-U
    dataset, January 2018

    • Hao, G.; Heidbrink, W.; Liu, D.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562065