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Title: Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U

Abstract

Helium line-ratios for electron temperature (Te) and density (ne) plasma diagnostic in the Scrape-Off-Layer (SOL) and Edge regions of tokamaks are widely used. Due to their intensities and proximity of wavelengths, the singlet 667.8 and 728.1 nm, and triplet 706.5 nm visible lines have been typically preferred. Time-dependency of the triplet line (706.5 nm) has been previously analyzed in detail by including transient effects on line-ratios during gas-puff diagnostic applications. In this work, several line-ratio combinations within each of the two spin systems are analyzed with the purpose of eliminating transient effects to extend the application of this powerful diagnostic to high temporal resolution characterization of plasmas. The analysis is done using synthetic emission modeling and diagnostic for low electron density NSTX SOL plasma conditions by several visible lines. Quasi-static equilibrium, and time-dependent models are employed to evaluate transient effects of the atomic population levels that may affect the derived electron temperatures and densities as the helium gas-puff penetrates the plasma. Ultimately, the analysis of a wider range of spectral lines will help to extend this powerful diagnostic to experiments where the wavelength range of the measured spectra may be constrained either by limitations of the spectrometer, or by othermore » conflicting lines from different ions.« less

Authors:
ORCiD logo [1];  [2];  [2];  [1];  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
  2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States); Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1259296
Grant/Contract Number:  
S0000787; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21. Topical Conference on High-Temperature Plasma Diagnostics (HTPD 2016), Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Line-ratio diagnostics; plasma diagnostics

Citation Formats

Muñoz Burgos, J. M., Barbui, T., Schmitz, O., Stutman, D., and Tritz, K. Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U. United States: N. p., 2016. Web. doi:10.1063/1.4955286.
Muñoz Burgos, J. M., Barbui, T., Schmitz, O., Stutman, D., & Tritz, K. Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U. United States. doi:10.1063/1.4955286.
Muñoz Burgos, J. M., Barbui, T., Schmitz, O., Stutman, D., and Tritz, K. Mon . "Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U". United States. doi:10.1063/1.4955286. https://www.osti.gov/servlets/purl/1259296.
@article{osti_1259296,
title = {Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U},
author = {Muñoz Burgos, J. M. and Barbui, T. and Schmitz, O. and Stutman, D. and Tritz, K.},
abstractNote = {Helium line-ratios for electron temperature (Te) and density (ne) plasma diagnostic in the Scrape-Off-Layer (SOL) and Edge regions of tokamaks are widely used. Due to their intensities and proximity of wavelengths, the singlet 667.8 and 728.1 nm, and triplet 706.5 nm visible lines have been typically preferred. Time-dependency of the triplet line (706.5 nm) has been previously analyzed in detail by including transient effects on line-ratios during gas-puff diagnostic applications. In this work, several line-ratio combinations within each of the two spin systems are analyzed with the purpose of eliminating transient effects to extend the application of this powerful diagnostic to high temporal resolution characterization of plasmas. The analysis is done using synthetic emission modeling and diagnostic for low electron density NSTX SOL plasma conditions by several visible lines. Quasi-static equilibrium, and time-dependent models are employed to evaluate transient effects of the atomic population levels that may affect the derived electron temperatures and densities as the helium gas-puff penetrates the plasma. Ultimately, the analysis of a wider range of spectral lines will help to extend this powerful diagnostic to experiments where the wavelength range of the measured spectra may be constrained either by limitations of the spectrometer, or by other conflicting lines from different ions.},
doi = {10.1063/1.4955286},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {7}
}

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Cited by: 3 works
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Works referenced in this record:

Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade
journal, May 2016

  • Muñoz Burgos, J. M.; Agostini, M.; Scarin, P.
  • Physics of Plasmas, Vol. 23, Issue 5
  • DOI: 10.1063/1.4948554

Optical measurements for turbulence characterization in RFX-mod edge
journal, October 2010

  • Agostini, M.; Scarin, P.; Cavazzana, R.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3478679

Status of electron temperature and density measurement with beam emission spectroscopy on thermal helium at TEXTOR
journal, September 2008


HELIOS: A helium line-ratio spectral-monitoring diagnostic used to generate high resolution profiles near the ion cyclotron resonant heating antenna on TEXTOR
journal, October 2012

  • Unterberg, E. A.; Schmitz, O.; Fehling, D. H.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4739236

Helium line intensity ratio in microwave-generated plasmas
journal, December 2004

  • Podder, N. K.; Johnson, J. A.; Raynor, C. T.
  • Physics of Plasmas, Vol. 11, Issue 12
  • DOI: 10.1063/1.1812535

Gas puff imaging of edge turbulence (invited)
journal, March 2003

  • Maqueda, R. J.; Wurden, G. A.; Stotler, D. P.
  • Review of Scientific Instruments, Vol. 74, Issue 3
  • DOI: 10.1063/1.1535249

High-speed imaging of edge turbulence in NSTX
journal, December 2003


Edge turbulence characterization in RFX-mod with optical diagnostics
journal, September 2009


Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U
dataset, January 2016

  • Bergos, J.; Barbui, T.; Schmitz, O.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1366719

Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U
dataset, January 2016

  • Munoz Burgos, J. M.; Barbui, T.; Schmitz, O.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562066

    Works referencing / citing this record:

    Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U
    dataset, January 2016

    • Bergos, J.; Barbui, T.; Schmitz, O.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1366719

    Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U
    dataset, January 2016

    • Bergos, J.; Barbui, T.; Schmitz, O.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1366719

    Electron temperature and electron density profiles measured with a thermal He-beam in the plasma boundary of TEXTOR
    journal, December 1992


    Gas puff imaging of edge turbulence (invited)
    journal, March 2003

    • Maqueda, R. J.; Wurden, G. A.; Stotler, D. P.
    • Review of Scientific Instruments, Vol. 74, Issue 3
    • DOI: 10.1063/1.1535249

    Helium line intensity ratio in microwave-generated plasmas
    journal, December 2004

    • Podder, N. K.; Johnson, J. A.; Raynor, C. T.
    • Physics of Plasmas, Vol. 11, Issue 12
    • DOI: 10.1063/1.1812535

    Optical measurements for turbulence characterization in RFX-mod edge
    journal, October 2010

    • Agostini, M.; Scarin, P.; Cavazzana, R.
    • Review of Scientific Instruments, Vol. 81, Issue 10
    • DOI: 10.1063/1.3478679

    HELIOS: A helium line-ratio spectral-monitoring diagnostic used to generate high resolution profiles near the ion cyclotron resonant heating antenna on TEXTOR
    journal, October 2012

    • Unterberg, E. A.; Schmitz, O.; Fehling, D. H.
    • Review of Scientific Instruments, Vol. 83, Issue 10
    • DOI: 10.1063/1.4739236

    Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade
    journal, May 2016

    • Muñoz Burgos, J. M.; Agostini, M.; Scarin, P.
    • Physics of Plasmas, Vol. 23, Issue 5
    • DOI: 10.1063/1.4948554

    Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices
    journal, April 2017

    • Zweben, S. J.; Terry, J. L.; Stotler, D. P.
    • Review of Scientific Instruments, Vol. 88, Issue 4
    • DOI: 10.1063/1.4981873

    High-speed imaging of edge turbulence in NSTX
    journal, December 2003


    Status of electron temperature and density measurement with beam emission spectroscopy on thermal helium at TEXTOR
    journal, September 2008


    Edge turbulence characterization in RFX-mod with optical diagnostics
    journal, September 2009


    Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U
    dataset, January 2016

    • Munoz Burgos, J. M.; Barbui, T.; Schmitz, O.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562066

    Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices
    journal, April 2017

    • Zweben, S. J.; Terry, J. L.; Stotler, D. P.
    • Review of Scientific Instruments, Vol. 88, Issue 4
    • DOI: 10.1063/1.4981873