Validation of Spectroscopic Model for Fe Ions in Non-Equilibrium Ionization Plasma in LHD and Hinode

Murakami, Izumi; Watanabe, Tetsuya; Suzuki, Chise; Morita, S.; Dong, Chengli; Tamura, N.; Yamamoto, Norimasa; Kato, Daiji; Sakaue, Hiroyuki; Hara, Hirohisa; Nakamura, Nobuyuki; Sudo, S.

doi:10.1585/pfr.9.1401056

Cited by 5 publications

(5 citation statements)

References 28 publications

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“…Three spectral lines with relatively weak intensities are always visible in the spectrum at 13.15±0.02 Å, 260.32±0.07 Å and 261.00±0.06 Å. Based on the present analysis and previous works we estimate that the spectral line at 13.15±0.02 Å is Cu XXI line [30], and two lines at 260.32±0.07 Å and 261.00±0.06 Å should be Cu XVIII [39].…”

Section: Copper (Z=29)supporting

confidence: 76%

“…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%

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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: Copper (Z=29)supporting

confidence: 76%

Section: Methodsmentioning

confidence: 99%

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 spectroscopy and atomic models of highly charged heavy ions in the Large Helical Device ultraviolet (EUV) spectrometers [9,10] are routinely running for studies on impurity transport. Accordingly, we have extensively promoted so far in the LHD a variety of spectroscopic studies relevant not only to fusion research but also to astrophysics, plasma applications and basic atomic physics [11][12][13][14][15].…”

Section: Plasma Physics and Controlled Fusionmentioning

confidence: 99%

Extreme ultraviolet spectroscopy and atomic models of highly charged heavy ions in the Large Helical Device

Suzuki

Murakami

Koike

et al. 2016

Plasma Phys. Control. Fusion

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We report recent results of extreme ultraviolet (EUV) spectroscopy of highly charged heavy ions in plasmas produced in the Large Helical Device (LHD). The LHD is an ideal source of experimental databases of EUV spectra because of high brightness and low opacity, combined with the availability of pellet injection systems and reliable diagnostic tools. The measured heavy elements include tungsten, tin, lanthanides and bismuth, which are motivated by ITER as well as a variety of plasma applications such as EUV lithography and biological microscopy. The observed spectral features drastically change between quasicontinuum and discrete depending on the plasma temperature, which leads to some new experimental identifications of spectral lines. We have developed collisional-radiative models for some of these ions based on the measurements. The atomic number dependence of the spectral feature is also discussed.

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“…For example, as a collaboration with the field of astrophysics, spectroscopic modelling for Fe ions in non-equilibrium ionization plasma has been developed taking advantage of the well measured electron temperature and density of the LHD plasma for the Fe emission data, and it is applied to analyze the solar spectra observed by HINODE [56]. Except for these tracers, TESPEL is also contributing to the investigation about the non-local transport owing to the flexibility of the pellet size, and it is also applied to the fast ion measurements.…”

Section: Discussionmentioning

confidence: 99%

Plasma Diagnostics with Tracer-Encapsulated Solid Pellet

Sudo

Tamura

Muto

et al. 2014

Plasma and Fusion Research

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The diagnostics method of a tracer-encapsulated solid pellet (TESPEL) has been developed. TESPEL consists of polystyrene as an outer shell and of specific material as a tracer in the core. Owing to the advantages of the TESPEL, the following results have been successfully obtained: (1) distinctive different feature of impurity transport between the plateau and Pfirsch-Schlüter regimes depending on the impurity source location which is analyzed with the STRAHL code, (2) specific feature of a non-local thermal transport such as abrupt increase of electron temperature in the plasma core in case of plasma cooling in the plasma periphery due to a small TESPEL injection, (3) spatially resolved energy distribution of the high energy particles obtained by a pellet charge exchange method, (4) longer impurity containment inside the magnetic island which is observed by depositing the tracers in the magnetic island by means of the TESPEL, and (5) identification of new spectral lines using interested atoms contained in the core of the TESPEL.

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Validation of Spectroscopic Model for Fe Ions in Non-Equilibrium Ionization Plasma in LHD and Hinode

Cited by 5 publications

References 28 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

Extreme ultraviolet spectroscopy and atomic models of highly charged heavy ions in the Large Helical Device

Plasma Diagnostics with Tracer-Encapsulated Solid Pellet

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