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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]
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  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. doi:10.1063/1.5031879.
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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
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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.
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@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 = {Mon Jun 18 00:00:00 EDT 2018},
month = {Mon Jun 18 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5031879
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Cited by: 3 works
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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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Works referenced in this record:

The NSTX fast-ion D-alpha diagnostic
journal, October 2008

  • Podestà, M.; Heidbrink, W. W.; Bell, R. E.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2956744

Analysis of fast-ion D α data from the National Spherical Torus Experiment
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Satellite-Earth remote sensor scatter effects on Earth scene radiometric accuracy
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Bayesian soft x-ray tomography and MHD mode analysis on HL-2A
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Enhancement of multichannel data in plasma physics by biorthogonal decomposition
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Impurity density derivation from bandpass soft x-ray tomography: applicability, perspectives and limitations
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A Code that Simulates Fast-Ion D α and Neutral Particle Measurements
journal, September 2011

Measurement of the Dα spectrum produced by fast ions in DIII-D
journal, March 2007

  • Luo, Y.; Heidbrink, W. W.; Burrell, K. H.
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  • DOI: 10.1063/1.2712806

Initial analysis of ocean color data from the ocean color and temperature scanner I Imagery analysis
journal, January 1999

Spatial and temporal analysis of DIII-D 3D magnetic diagnostic data
journal, August 2016

  • Strait, E. J.; King, J. D.; Hanson, J. M.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4960419

A tangentially viewing fast ion D-alpha diagnostic for NSTX
journal, October 2010

  • Bortolon, A.; Heidbrink, W. W.; Podestà, M.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3495768

Dual view FIDA measurements on MAST
journal, July 2013

Measurement and simulation of passive fast-ion D-alpha emission from the DIII-D tokamak
journal, September 2016

Fast-ion D-alpha measurements at ASDEX Upgrade
journal, April 2011

Active and passive spectroscopic imaging in the DIII-D tokamak
journal, March 2010

Calibration techniques for fast-ion D α diagnostics
journal, October 2012

  • Heidbrink, W. W.; Bortolon, A.; Muscatello, C. M.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4732060

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

Dual view FIDA measurements on MAST
preprint, January 2013

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    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
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      Figures / Tables found in this record:

      FIG. 1 (p. 16)figure
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      FIG. 18 (p. 31)figure
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