2015
DOI: 10.1007/s10751-015-1195-z
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Intensity ratio measurements for density sensitive lines of highly charged Fe ions

Abstract: Intensity ratio of density sensitive emission lines emitted from Fe ions in the extreme ultraviolet region is important for astrophysics applications. We report highresolution intensity ratio measurements for Fe ions performed at Tokyo EBIT laboratory by employing a flat-field grazing incidence spectrometer. The experimental intensity ratios of Fe X and Fe XII are plotted as a function of electron density for different electron beam currents. The experimental results are compared with the predicted intensity r… Show more

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Cited by 4 publications
(4 citation statements)
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“…To obtain a high order of dispersion, we used a concave grating with large radius of curvature (Hitachi 001-0660). The average groove number is same as that of the flat-field grazing incidence spectrometer grating used in our previous studies (Nakamura et al 2011), however, the larger radius of curvature (13 450 mm) and the larger distance from the grating to the focal plane (563.2 mm) makes the dispersion on the focal plane higher as 2.6 Å/mm (Ali et al 2015). Since an EBIT represents a thin line shape source, in the present setup, we therefore used no entrance slit, that is, the spectrometer was used in a slitless configuration.…”
Section: Experiments and Data Analysismentioning
confidence: 96%
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“…To obtain a high order of dispersion, we used a concave grating with large radius of curvature (Hitachi 001-0660). The average groove number is same as that of the flat-field grazing incidence spectrometer grating used in our previous studies (Nakamura et al 2011), however, the larger radius of curvature (13 450 mm) and the larger distance from the grating to the focal plane (563.2 mm) makes the dispersion on the focal plane higher as 2.6 Å/mm (Ali et al 2015). Since an EBIT represents a thin line shape source, in the present setup, we therefore used no entrance slit, that is, the spectrometer was used in a slitless configuration.…”
Section: Experiments and Data Analysismentioning
confidence: 96%
“…This model has been employed successfully in several previous EBIT studies to identify, simulate and extract spectral line intensities as described in (Nakamura et al 2011;Ralchenko 2013;Ali et al 2015;Ding et al 2016). The CR models give fractional population of ions in the excited states by assuming isotropic and optically thin plasmas as it exists in CoBIT.…”
Section: Calculationsmentioning
confidence: 99%
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“…Extreme ultraviolet spectra of Fe ions have been measured in laboratory plasmas using the compact electron beam ion trap (CoBIT) [45] and the Large Helical Device (LHD) [46] and compared with theoretical calculations using collisional-radiative models. We examined Fe q+ ions with q = 9-16, 20, and 21, using their line intensities [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62]. We continue to compile data for Fe ions, and the data evaluation using laboratory experiments is ongoing.…”
Section: Data Evaluation Using Nifs Databasementioning
confidence: 99%