EUV spectroscopy of Xe ions from the large helical device at the National Institute for Fusion Science for stable plasmas and plasmas undergoing radiation collapse

Katō, Takako; Funaba, H.; Sato, K.; Kato, Daiji; Song, Mi‐Young; Yamamoto, Norimasa; Tanuma, H.; Ohashi, Hayato; Sasaki, Akira; Koike, Fumihiro; Nishihara, Katsunobu; Fahy, Kenneth; O'Sullivan, Gerry

doi:10.1088/0953-4075/41/3/035703

Cited by 19 publications

(17 citation statements)

References 33 publications

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“…In earlier experiments on Sn and Xe injection in the LHD, it was noted that for the majority of ion stages, only resonance transitions to the ground configuration were observed but a notable exception in each case was provided by Cu-like Sn and Xe ions [22,27,28]. Cu-like ions have a single 4s electron outside a closed n = 3 shell.…”

Section: +mentioning

confidence: 99%

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Suzuki¹,

Harte²,

Kilbane³

et al. 2011

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

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The UCD community has made this article openly available. Please share how this access benefits you. Your story matters! (@ucd_oa) Some rights reserved. For more information, please see the item record link above. TitleInterpretation of spectral emission around 20 nm region from tungsten ions observed in fusion device plasmas Abstract. We have measured extreme ultraviolet (EUV) spectra from tungsten ions around 20 nm region in plasmas produced in the Large Helical Device at the National Institute for Fusion Science. The spectra after injecting a tungsten pellet into a hydrogen plasma were monitored by a grazing incidence spectrometer. Quasicontinuum spectral feature arising from unresolved transition array (UTA) was observed around 20 nm region in plasmas with temperatures below 1.0 keV. This structure is reasonably considered to be the same one as those observed in another tokamak device or laser produced plasmas under low temperature conditions. Atomic structure calculations have been performed for tungsten ions with open 5p, 5s and 4f subshells (W 7+ -W 27+ ) to interpret this commonly observed feature around 20 nm. Wavelengths and gA values for these transitions were calculated, and their mean wavelengths and extent were compared with the observations, which suggests that the emission largely arises from n = 5-5 transitions in stages lower than W 27+ .

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Section: +mentioning

confidence: 99%

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Suzuki¹,

Harte²,

Kilbane³

et al. 2011

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

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“…The EUV spectra were recorded by a grazing incidence spectrometer SOXMOS [39] whose groove density and focal length were 600 mm collapse [24,41,42]. The spectrometer was carefully calibrated by observing carbon, boron and neon lines whose wavelengths are well known following neon injection (carbon and boron lines are always present as impurities in the LHD).…”

Section: Figure 1: Time Sequences Of Neutral Beam Injection (Nbi Heamentioning

confidence: 99%

Tungsten spectra recorded at the LHD and comparison with calculations

Harte¹,

Suzuki²,

Katō³

et al. 2010

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

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“…Biedermann et al [5] observed lines in EBIT spectra for Rb-like Xel7+ to Cu-like Xe25+. Kato et al [6] measured EUV spectra of xenon ions from the large helical device (LHD). Crespo et al [7] measured transitions in highly charged ions of Kr, Xe, and Ba at the Lawrence Livermore National Laboratory EBIT.…”

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confidence: 99%

Lifetimes of4p54dlevels in highly ionized atoms

2015

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E nergy levels, lifetim es, and wave function com positions have been com puted for all atom ic states o f the 4 p b and 4 p 54d configurations using the m ulticonfiguration D irac-H artree-Fock m ethod. C alculations w ere done by parity and the configuration state function expansions w ere obtained by allow ing single and double substitutions from the the 4 p b and 4 p b4d single references w ith orbitals in an orbital set that w as extended to n = 7 and all possible angular sym m etries. L ifetim es are com puted from E l, E 2, and M \ transitions betw een these levels. E nergy levels and transition energies (or w avelengths) are com pared w ith other theory and experim ent, w hen available. T ransition data for the 4 p b 'S0 -4 p 54d J = 1 transitions are investigated in detail w ith respect to convergence o f transition energies and the length and velocity form s o f the line strengths. By classifying the upper states by J, parity (7r), and position, the com positions o f the states w ith the sam e three quantum num ber change sm oothly as a function o f the nuclear charge Z and transition energies and transition m atrix elem ents can be approxim ated by polynom ial expressions in Z . A zero in the transition m atrix elem ent for the 'S0 -3P,° transition leads to a long lifetim e at Z « 58.

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EUV spectroscopy of Xe ions from the large helical device at the National Institute for Fusion Science for stable plasmas and plasmas undergoing radiation collapse

Cited by 19 publications

References 33 publications

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Tungsten spectra recorded at the LHD and comparison with calculations

Lifetimes of4p54dlevels in highly ionized atoms

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