Radial profiles and emissivity ratio analysis of Ne-like FeXVII n = 3−2 transitions in Large Helical Device

Huang, Xianli; Wang, E. H.; Dong, Chuanfei; Morita, S.; Oishi, Tetsutarou; Murakami, Izumi; Goto, M.

doi:10.3938/jkps.65.1265

Cited by 4 publications

(7 citation statements)

References 23 publications

(25 reference statements)

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“…The transition array is composed of transitions of Fe XVII to Fe XXIII. As reported in previous studies [10,30], several Fe XVII lines exist in this wavelength range. Those are labeled with notations by Beiersdorfer et al [40], e.g.…”

Section: Methodssupporting

confidence: 86%

“…In the wavelength range of 8-14 Å, the copper n = 3-2 L α transition array, which is composed of L α lines from Ne-Like to Be-Like ions (Cu XX-XXVI), is observed. Several Ne-like Cu XX lines are identified in this range [29,30], e.g. 3C (11.383 Å), 3D (11.594 Å), 3F (12.570 Å) and 3G (12.827 Å).…”

Section: Copper (Z=29)mentioning

confidence: 92%

“…In figure 4, the emission lines from iron ions can be easily found when the comparison is made between the two spectra before and after the iron burst. The iron spectra are carefully identified based on the National Institute of Standards Technology (NIST) database [32] and previous studies [10,29,30,38,39]. The identified iron lines are denoted with line notations in red and green colors.…”

Section: Methodsmentioning

confidence: 99%

“…Mo spectral lines were also subsequently identified in JET [27] and LHD [28] at 70-110 Å and 50-500 Å, respectively. Fe spectral lines at 10-150 Å was observed and analyzed in LHD [29,30] and TJ-II [31]. Cu spectral lines were identified in wavelength range of 10-20 Å in NSTX [13].…”

Section: Introductionmentioning

confidence: 99%

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Line identification of extreme ultraviolet (EUV) spectra from iron, copper and molybdenum ions in EAST tokamak

Zhang

Cheng

et al. 2022

Phys. Scr.

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Extreme ultraviolet (EUV) spectra emitted from iron and copper ions in a range of 8-500 Å and molybdenum ions in a range of 8-400 Å were measured in Experimental Advanced Superconducting Tokamak (EAST) discharges accompanied with spontaneous sputtering events, by which metallic impurity influxes are suddenly increased in the discharge. Several spectral lines from L-, M-, and N-shell partially ionized ions have been successfully observed with two EUV spectrometers named EUV_Short and EUV_Long working in wavelength ranges of 8-130 Å and 20-500 Å, respectively. The wavelength position is accurately calibrated in-situ based on several well-known spectra of low-Z impurity ions. The line identification is carefully performed based on the National Institute of Standards Technology (NIST) database and previously published experimental data. As a result, it is found that B-, Be-, and Li-like iron and copper spectra Al-, Mg-, and Na-like molybdenum spectra appear in discharges with high central electron temperature (>1.8 keV). The highest ionization stages identified here are Li-like iron and copper and Na-like molybdenum, e.g. Fe XXIV at 192.028 Å (1s22p 2P3/2→1s22s 2S1/2), Cu XXVII at 153.513 Å (1s22p 2P3/2→1s22s 2S1/2) and Mo XXXII at 127.868 Å (2p63p 2P3/2→2p63s 2S1/2). Two unresolved transition arrays of molybdenum ions (Mo-UTAs) appear at wavelength ranges of 15-30 Å and 65-95 Å, and are preliminarily identified as Mo XX-Mo XXXII and Mo XVII-Mo XXXII, respectively. In addition, six spectral lines are newly found by comparing a time evolution of the line intensity from impurity ions in different ionization stages, i.e. Fe XVIII at 17.60±0.02 Å, Cu XXI at 13.15±0.02 Å, Cu XVIII at 260.32±0.07 Å, Cu XVIII at 261.00±0.06 Å, Mo XXVIII at 85.30±0.03 Å and Mo XXIX at 89.59±0.03 Å. The wavelengths of EUV spectra identified in this work are summarized in tables with transitions for each impurity species.

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Section: Methodssupporting

confidence: 86%

Section: Copper (Z=29)mentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Line identification of extreme ultraviolet (EUV) spectra from iron, copper and molybdenum ions in EAST tokamak

Zhang

Cheng

et al. 2022

Phys. Scr.

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“…This is a point that experiments at electron beam ion trap and free-electron x-ray laser facilities are testing and confirming [119,222]. It was also affirmed in a recent measurement on LHD [227].…”

Section: The Fe XVII Problemmentioning

confidence: 52%

Highly charged ions in magnetic fusion plasmas: research opportunities and diagnostic necessities

Beiersdörfer

2015

J. Phys. B: At. Mol. Opt. Phys.

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Highly charged ions play a crucial role in magnetic fusion plasmas. These plasmas are excellent sources for producing highly charged ions and copious amounts of radiation for studying their atomic properties. These studies include calibration of density diagnostics, x-ray production by charge exchange, line identifications and accurate wavelength measurements, and benchmark data for ionization balance calculations. Studies of magnetic fusion plasmas also consume a large amount of atomic data, especially in order to develop new spectral diagnostics. Examples we give are the need for highly accurate wavelengths as references for measurements of bulk plasma motion, the need for accurate line excitation rates that encompass both electron-impact excitation and indirect line formation processes, for accurate position and resonance strength information of dielectronic recombination satellite lines that may broaden or shift diagnostic lines or that may provide electron temperature information, and the need for accurate ionization balance calculations. We show that the highly charged ions of several elements are of special current interest to magnetic fusion, notably highly charged ions of argon, iron, krypton, xenon, and foremost of tungsten. The electron temperatures thought to be achievable in the near future may produce W70+ ions and possibly ions with even higher charge states. This means that all but a few of the most highly charged ions are of potential interest as plasma diagnostics or are available for basic research.

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Measurement of L-Shell Emission from Iron-Group Elements for High-Resolution X-Ray Spectroscopy in Future Astronomy

Ohshiro

Kawate

YAMAGUCHI

et al. 2023

Plasma and Fusion Research

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Measuring abundance of iron-group elements (IGEs; Cr, Mn, Fe, and Ni) is essential for understanding astrophysical phenomena such as supernovae. The L-shell emissions from IGEs will soon be resolved by nextgeneration X-ray satellites, enabling more accurate measurements of abundance. However, theoretical calculations for these L-shell transitions have not been sufficiently validated using experimental work. Herein, large helical device (LHD) experiments that measured L-shell emission from Ni and Mn are reported. The temporal evolution of LHD plasma is characterized by three phases, each of which resolves different L-shell emissions. We modeled EUV-Short spectra considering LHD plasma structure with AtomDB, an atomic database widely used in the X-ray astronomy community. We discovered that the observed intensity ratios of the 3C (2p 5 3d 1 1 P 1 → 2p 6 1 S 0 ) to 3D (2p 5 3d 1 3 D 1 → 2p 6 1 S 0 ) transition of Ne-like ions are 0.4 -0.6 times lower than the theoretically predicted ratios.

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Radial profiles and emissivity ratio analysis of Ne-like FeXVII n = 3−2 transitions in Large Helical Device

Cited by 4 publications

References 23 publications

Line identification of extreme ultraviolet (EUV) spectra from iron, copper and molybdenum ions in EAST tokamak

Line identification of extreme ultraviolet (EUV) spectra from iron, copper and molybdenum ions in EAST tokamak

Highly charged ions in magnetic fusion plasmas: research opportunities and diagnostic necessities

Measurement of L-Shell Emission from Iron-Group Elements for High-Resolution X-Ray Spectroscopy in Future Astronomy

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