2021
DOI: 10.1088/1741-4326/ac22d1
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Assessment of W density in LHD core plasmas using visible forbidden lines of highly charged W ions

Abstract: Visible magnetic-dipole (M1) lines can serve as a novel diagnostic mean of tungsten in ITER and future DEMO reactors. Here a local tungsten density in core plasmas of the Large Helical Device (LHD) is successfully assessed with the measurement of visible M1 lines emitted by W 26+ and W 27+ . By such a measurement, (i) the radial profile of total tungsten density in the LHD core plasmas with a line-averaged electron density of ~ 4×10 19 m -3 and central electron temperature of ~ 1 keV is found to be a hollow, a… Show more

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Cited by 11 publications
(10 citation statements)
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“…Besides the lines a-d, the lines of W 26+ at 320.97(9) nm, W 25+ at 334.20(9) nm, W 24+ at 323.22(8) nm, and W 23+ at 322.58(8) nm and 332.02 (9) nm are also identified at LHD [10,11,13]. These lines are, therefore, potentially useful for the tungsten diagnostics of fusion plasmas.…”
Section: Discussionmentioning
confidence: 96%
See 1 more Smart Citation
“…Besides the lines a-d, the lines of W 26+ at 320.97(9) nm, W 25+ at 334.20(9) nm, W 24+ at 323.22(8) nm, and W 23+ at 322.58(8) nm and 332.02 (9) nm are also identified at LHD [10,11,13]. These lines are, therefore, potentially useful for the tungsten diagnostics of fusion plasmas.…”
Section: Discussionmentioning
confidence: 96%
“…Moreover, mirrors and optical fibers are available to avoid fusion neutron irradiation to detectors. Recently, a local tungsten density in core plasmas of the LHD was successfully assessed with near-UV magnetic-dipole (M1) lines emitted by W 26+ and W 27+ ions [13]. Such visible and near-UV emission lines of highly charged W ions were intensively measured by different research groups, using electron-beam-ion-traps (EBITs): W 7+ -W 9+ [14,15], W 8+ -W 28+ [16], W 11+ [17], W 12+ -W 14+ [18], W 13+ [19], W 24+ -W 25+ [20], W 25+ [21], W 26+ [22,23], W 26+ -W 33+ [24], W 27+ [25], W 28+ [26,27], and W 52+ [28][29][30].…”
Section: Introductionmentioning
confidence: 99%
“…W 26+ 3337.05 Å (4d 10 4f 2 3 F, J = 4 → 4d 10 4f 2 3 F, J = 3), W 26+ 3357.61 Å (4d 10 4f 2 3 F, J = 4 → 4d 10 4f 2 1 G, J = 4), and W 27+ 3377.42 Å (4d 10 4f 2 F • , J = 7/2 → 4d 10 4f 2 F • , J = 5/2) were observed in the spectra with T e0 = 3.0 keV and 1.7 keV, as shown in Figure 4a,b, respectively. These W 26+ and W 27+ lines have already been identified as the M1 forbidden transition lines [16,17]. These lines became less significant in the spectrum with T e0 = 0.6 keV as shown in Figure 4c, and completely disappeared in the spectrum with T e0 = 0 keV as shown in Figure 4d.…”
Section: Tungsten Line Emissions In the Visible Vuv And Euv Wavelength Rangesmentioning
confidence: 64%
“…The line emissions from the neutral atoms, W 0 , as well as the singly ionized ions, W + , were observed using visible spectroscopy in the wavelength range of 4000-4400 Å [11]. The visible spectroscopy has also observed magnetic dipole (M1) forbidden transition lines from W 26+ and W 27+ in the wavelength range of 3300-3900 Å [15][16][17]. The line emissions from tungsten ions in low charge states, W 2+ -W 6+ , have been identified in the VUV range of 500-1500 Å [18].…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, for interpretation, the identification of the spectral emission of differently charged tungsten ions is necessary [3]. Furthermore, spectral lines of these highly charged tungsten ions could be used to estimate tungsten impurities in the plasma of Tokamak or stellarator [4][5][6]. * Author to whom any correspondence should be addressed.…”
Section: Introductionmentioning
confidence: 99%