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Title: Electron-density-sensitive Line Ratios of Fe xiii– xvi from Laboratory Sources Compared to CHIANTI

Abstract

We present electron-density-sensitive line ratios for Fe xiii– xvi measured in the spectral wavelength range of 200–440 Å and an electron density range of (1-4) × 1013 cm-3. The results provide a test at the high-density limit of density-sensitive line ratios useful for astrophysical studies. The measurements were performed on the National Spherical Torus Experiment-Upgrade, where electron densities were measured independently by the laser Thomson scattering diagnostic. Spectra were collected with a flat-field grazing-incidence spectrometer, which provided a spectral resolution of up to 0.3 Å, i.e., high resolution across the broad wavelength range. The response of the instrument was relatively calibrated using spectroscopic techniques in order to improve accuracy. Lastly, the line ratios are compared to other laboratory sources and the latest version of CHIANTI (8.0.2), and an agreement within 30% is found.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, 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); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1432662
Alternate Identifier(s):
OSTI ID: 1463031
Report Number(s):
LLNL-JRNL-737511
Journal ID: ISSN 1538-4357; TRN: US1802661
Grant/Contract Number:  
AC02-09CH11466; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 854; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; atomic data; plasmas; stars: flare; Sun: UV radiation; techniques: spectroscopic; ultraviolet: stars; Physics - Plasma physics

Citation Formats

Weller, M. E., Beiersdorfer, P., Soukhanovskii, V. A., Scotti, F., and LeBlanc, B. P. Electron-density-sensitive Line Ratios of Fe xiii– xvi from Laboratory Sources Compared to CHIANTI. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aaa5a1.
Weller, M. E., Beiersdorfer, P., Soukhanovskii, V. A., Scotti, F., & LeBlanc, B. P. Electron-density-sensitive Line Ratios of Fe xiii– xvi from Laboratory Sources Compared to CHIANTI. United States. doi:10.3847/1538-4357/aaa5a1.
Weller, M. E., Beiersdorfer, P., Soukhanovskii, V. A., Scotti, F., and LeBlanc, B. P. Thu . "Electron-density-sensitive Line Ratios of Fe xiii– xvi from Laboratory Sources Compared to CHIANTI". United States. doi:10.3847/1538-4357/aaa5a1. https://www.osti.gov/servlets/purl/1432662.
@article{osti_1432662,
title = {Electron-density-sensitive Line Ratios of Fe xiii– xvi from Laboratory Sources Compared to CHIANTI},
author = {Weller, M. E. and Beiersdorfer, P. and Soukhanovskii, V. A. and Scotti, F. and LeBlanc, B. P.},
abstractNote = {We present electron-density-sensitive line ratios for Fe xiii– xvi measured in the spectral wavelength range of 200–440 Å and an electron density range of (1-4) × 1013 cm-3. The results provide a test at the high-density limit of density-sensitive line ratios useful for astrophysical studies. The measurements were performed on the National Spherical Torus Experiment-Upgrade, where electron densities were measured independently by the laser Thomson scattering diagnostic. Spectra were collected with a flat-field grazing-incidence spectrometer, which provided a spectral resolution of up to 0.3 Å, i.e., high resolution across the broad wavelength range. The response of the instrument was relatively calibrated using spectroscopic techniques in order to improve accuracy. Lastly, the line ratios are compared to other laboratory sources and the latest version of CHIANTI (8.0.2), and an agreement within 30% is found.},
doi = {10.3847/1538-4357/aaa5a1},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 854,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 1 work
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Figures / Tables:

Figure 1 Figure 1: Spectra collected with LoWEUS from NSTX-U discharge 205079 during 200-270 ms. An expanded spectrum is shown below for more clarity. Fe XIII-XVI lines are highlighted in black, while lines from all other elements are in gray.

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    Works referencing / citing this record:

    Fe XIII line intensities in solar plasmas observed by SERTS
    journal, February 2002


    High-resolution time-resolved extreme ultraviolet spectroscopy on NSTX
    journal, October 2012

    • Lepson, J. K.; Beiersdorfer, P.; Clementson, J.
    • Review of Scientific Instruments, Vol. 83, Issue 10
    • DOI: 10.1063/1.4731753

    An assessment of Fe xx–Fe xxii emission lines in SDO/EVE data as diagnostics for high-density solar flare plasmas using EUVE stellar observations
    journal, March 2017

    • Keenan, F. P.; Milligan, R. O.; Mathioudakis, M.
    • Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 1
    • DOI: 10.1093/mnras/stx525

    Electron-density-sensitive Line Ratios of Fe XIII--XVI from Laboratory Sources Compared to CHIANTI
    dataset, January 2018

    • Weller, M.; Beiersdorfer, P.; Soukhanovskii, V.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562038

    Fe xii emission lines in spectra obtained with the Solar EUV Rocket Telescope andSpectrograph (SERTS)
    journal, February 1996

    • Keenan, F. P.; Thomas, R. J.; Neupert, W. M.
    • Monthly Notices of the Royal Astronomical Society, Vol. 278, Issue 3
    • DOI: 10.1093/mnras/278.3.773

    Three new extreme ultraviolet spectrometers on NSTX-U for impurity monitoring
    journal, August 2016

    • Weller, M. E.; Beiersdorfer, P.; Soukhanovskii, V. A.
    • Review of Scientific Instruments, Vol. 87, Issue 11
    • DOI: 10.1063/1.4960755

    Extreme ultraviolet spectrum of a solar active region from SERTS
    journal, March 1994

    • Thomas, Roger J.; Neupert, Werner M.
    • The Astrophysical Journal Supplement Series, Vol. 91
    • DOI: 10.1086/191944

    Prospects for the Thomson scattering system on NSTX-Upgrade
    journal, October 2012

    • Diallo, A.; LeBlanc, B. P.; Labik, G.
    • Review of Scientific Instruments, Vol. 83, Issue 10
    • DOI: 10.1063/1.4740267

    Spectroscopy in the extreme ultraviolet on an electron beam ion trap
    journal, January 1999

    • Beiersdorfer, P.; López-Urrutia, J. R. Crespo; Springer, P.
    • Review of Scientific Instruments, Vol. 70, Issue 1
    • DOI: 10.1063/1.1149324

    Low-density laboratory spectra near the He ii λ 304 line
    journal, February 2016


    New model of iron spectra in the extreme ultraviolet and application to SERTS and EUV observations: A solar active region and capella
    journal, April 1995

    • Brickhouse, N. S.; Raymond, J. C.; Smith, B. W.
    • The Astrophysical Journal Supplement Series, Vol. 97
    • DOI: 10.1086/192150

    Fe xiii emission lines in active region spectra obtained with the Solar Extreme-Ultraviolet Research Telescope and Spectrograph
    journal, March 2007


    The Extreme Ultraviolet Explorer: overview and calibration
    journal, January 1990


    CHIANTI – An atomic database for emission lines. Version 8
    journal, October 2015


    Responsivity calibration of the LoWEUS spectrometer
    journal, September 2016

    • Lepson, J. K.; Beiersdorfer, P.; Kaita, R.
    • Review of Scientific Instruments, Vol. 87, Issue 11
    • DOI: 10.1063/1.4960729

    Emission lines of Fe xv in spectra obtained with the Solar Extreme-Ultraviolet Research Telescope and Spectrograph
    journal, February 2005


    CHIANTI - an atomic database for emission lines: I. Wavelengths greater than 50 Å
    journal, October 1997

    • Dere, K. P.; Landi, E.; Mason, H. E.
    • Astronomy and Astrophysics Supplement Series, Vol. 125, Issue 1
    • DOI: 10.1051/aas:1997368

    Measurements of density dependent intensity ratios of extreme ultraviolet line emission from Fe X, XI, and XII
    journal, May 2017


    The Solar Dynamics Observatory (SDO)
    journal, October 2011