Measurement and Modeling of Density‐Sensitive Lines of Fe<scp>xiii</scp>in the Extreme Ultraviolet

Yamamoto, Norimasa; Katō, Takako; Funaba, H.; Sato, K.; Tamura, N.; Sudo, S.; Beiersdörfer, P.; Lepson, J. K.

doi:10.1086/592262

Cited by 29 publications

(34 citation statements)

References 23 publications

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“…By recording spectra throughout the discharge every 0.1 s, spectra with different ionization balances are obtained. For example, while the emission from Fe xxiv dominates the spectral region near 200Å during the main part of the discharge, after the end of the plasma heating the temperature is sufficiently low to see emission from Fe viii through Fe xiii, similar to the measurements made on EBIT-II [16]. The wavelength scale was determined using 15 strong Fe lines between 171.07Å and 211.33 A, as the wavelengths of the iron emission lines in this region are well known.…”

Section: Spectroscopic Measurementssupporting

confidence: 59%

“…The Large Helical Device (LHD) is a steady-state stellarator at the National Institute for Fusion Science in Toki, Japan [15,16]. Measurements on the LHD were made with the SOXMOS EUV grazing-incidence spectrometer [17] covering the wavelength range from 158 to 214Å.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

“…Essentially all lines in the spectra have been identified and are labelled. For identification we relied on the atomic data provided by the CHIANTI spectral model [23,24], as we found that the CHIANTI database did a very good job at reproducing the iron spectra from the EBIT-II and the LHD [16]. Figure 3.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Iron emission lines in solar and laboratory plasmas

Lepson

Beiersdörfer

Hurwitz

et al. 2008

J. Phys.: Conf. Ser.

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Section: Spectroscopic Measurementssupporting

confidence: 59%

Section: Spectroscopic Measurementsmentioning

confidence: 99%

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Iron emission lines in solar and laboratory plasmas

Lepson

Beiersdörfer

Hurwitz

et al. 2008

J. Phys.: Conf. Ser.

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“…We had constructed a collisional-radiative model for Fe ion lines analysis [4]. In this study, we revised the model about electron velocity distribution for spectra analysis of the EBIT.…”

Section: Electron Velocity Distributionmentioning

confidence: 99%

“…Our model was also applied to LHD (large helical device) plasma at NIFS (National Institute for Fusion Science) as the benchmark test [4]. In this study, spectra measured by an EBIT (electron beam ion trap) [5] are adopted as a benchmark test.…”

Section: Introductionmentioning

confidence: 99%

Analysis of EUV spectra from highly charged iron ions with a compact EBIT

Yamamoto

Sakaue

Kato

et al. 2009

J. Phys.: Conf. Ser.

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Abstract. For benchmark tests of the spectral analysis tool for solar plasma, applying the theoretical plasma radiation model to the laboratory plasma is important. In this paper, a compact-EBIT (Electron Beam Ion Trap) was adopted as the laboratory plasma, and extreme UV spectra of Fe ions were measured by the flat-field grazing-incidence spectrometer with no slit. In order to analyze the spectra from plasma generated by mono-energetic electron beam, our model was revised in term of an electron velocity distribution. Consequently, the measured spectra by the compact-EBIT were analyzed by our revised model. IntroductionSolar observations have been progressed by HINODE satellite that was launched on 2006 September 23 JST [1]. HINODE satellite has a high precise spectrometer EIS (EUV Imaging Spectrometer). EIS measure EUV spectra in the range of 170-210Å and 250-290Å. In these wavelength ranges, many Mshell Fe ion lines and some L-shell ion lines are measured. These ions are found in the electron temperature of several ten eV to few hundred eV (few keV in flare). M-shell Fe ion lines are often applied for density diagnostics in the region between transition and corona of the Sun. Therefore, the plasma diagnostic tool for line intensity analysis is important and the tool should be evaluated by applying to some laboratory plasmas where the parameters are under control.In the previous study, the benchmark tests by CHIANTI code [2] and our original model including the most recent atomic data have been carried out by applying to EIS's spectra from solar plasma [3]. Our model was also applied to LHD (large helical device) plasma at NIFS (National Institute for Fusion Science) as the benchmark test [4]. In this study, spectra measured by an EBIT (electron beam ion trap) [5] are adopted as a benchmark test. The generated plasma by EBIT has a simpler plasma parameter profile than magnetic confined plasma. However, an electron energy of the Tokyo-EBIT is much too high to produce M-shell iron ions. Therefore we build a new compact-EBIT [6]. In this paper, we present the analysis of the first data obtained with the compact-EBIT.

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Accurate multiconfiguration calculations of energy levels, lifetimes, and transition rates for the silicon isoelectronic sequence

Jönsson

Radžiūtė

Gaigalas

et al. 2015

A&A

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Multiconfiguration Dirac-Hartree-Fock (MCDHF) calculations and relativistic configuration interaction (RCI) calculations are performed for states of the 3s 2 3p 2 , 3s3p 3 and 3s 2 3p3d configurations in the Si-like ions Ti IX -Ge XIX, Sr XXV, Zr XXVII and Mo XXIX. Valence and core-valence electron correlation effects are accounted for through large configuration state function expansions. Calculated energy levels are compared with data from other calculations and with experimental data from the reference databases. Lifetime and transition rates along with uncertainty estimations are given for all ions. Energies from the calculations are in excellent agreement with observations and computed wavelength are almost of spectroscopic accuracy, aiding line identification in spectra.

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Measurement and Modeling of Density‐Sensitive Lines of Fexiiiin the Extreme Ultraviolet

Cited by 29 publications

References 23 publications

Iron emission lines in solar and laboratory plasmas

Iron emission lines in solar and laboratory plasmas

Analysis of EUV spectra from highly charged iron ions with a compact EBIT

Accurate multiconfiguration calculations of energy levels, lifetimes, and transition rates for the silicon isoelectronic sequence

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