Characteristics of the Shanghai high-temperature superconducting electron-beam ion trap and studies of the space-charge effect under ultralow-energy operating conditions

Tu, Bingsheng; Lu, Qifeng; Cheng, Tiantao; Li, M. C.; Yang, Y.; Yao, Ke; Shen, Yang; Lu, D. C.; Xiao, Jun; Hutton, R.; Zou, Yaming

doi:10.1063/1.5004426

Cited by 8 publications

(10 citation statements)

References 29 publications

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“…In case of lowly charged tungsten ions, the ionization energy interval of adjacent charged ions is comparable to , and thus confuse the charge state identification. The space charge effect can be estimated by [46] , V…”

Section: Wavelength(nm)mentioning

confidence: 99%

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Observation of indirect ionization of W7+ in an electron-beam ion-trap plasma

Tian

et al. 2019

Phys. Rev. A

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In this work, visible and EUV spectra of W have been measured using the high-temperature superconducting electron-beam ion trap at the Shanghai EBIT laboratory under extremely low-energy conditions (lower than the nominal electron beam energy of 130 eV). The relevant atomic structure has been calculated by using the flexible atomic code package based on the relativistic configuration interaction method. The GRASP2K code in the framework of the multi-configuration Dirac-Hartree-Fock method is employed as well when high-precision atomic parameters are required. The W spectra are observed 2 charge states in advance according to the ionization energy of W . A hypothesis for the charge-state evolution of W is proposed based on our experimental and theoretical results, that is, the occurrence of W ions results from indirect ionization caused by cascade excitation between some metastable states of lower-charge-state W ions, at the nominal electron beam energy of 59 eV.

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Section: Wavelength(nm)mentioning

confidence: 99%

“…Here a coefficient of 0.4 is introduced based on the results in Ref. [46], where the experimental conditions are very similar to ours. It should be noticed that this coefficient may introduce an uncertainty of about 10% in this case.…”

Section: Wavelength(nm)mentioning

confidence: 99%

Observation of indirect ionization of W7+ in an electron-beam ion-trap plasma

Tian

et al. 2019

Phys. Rev. A

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“…The electron-beam energy is corrected for the space-charge effect described in Ref. 73. As shown in FIG.…”

Section: Preliminary Test For Line Identificationmentioning

confidence: 99%

A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions

Liang

Wang

et al. 2019

Review of Scientific Instruments

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A low-energy, compact and superconducting electron beam ion trap (the Shanghai-Wuhan EBIT or SW-EBIT) for extraction of highly charged ions is presented. The magnetic field in the central drift tube of the SW-EBIT is approximately 0.21 T produced by a pair of high-temperature superconducting coils. The electron-beam energy of the SW-EBIT is in the range of 30-4000 eV, and the maximum electron-beam current is up to 9 mA. Acting as a source of highly charged ions, the ion-beam optics for extraction is integrated, including an ion extractor and an Einzel lens. A Wien filter is then used to measure the charge-state distribution of the extracted ions. In this work, the tungsten ions below the charge state of 15 are produced, extracted, and analyzed. The chargestate distributions and spectra in the range of 530-580 nm of tungsten ions are measured simultaneously with the electron-beam energy of 279 eV and 300 eV, which preliminarily indicates that the 549.9 nm line comes from W 14+ .

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“…Thus, the measured values of Γ e and Γ i and the instrument readback of I e and v e would generate the experimental value of n eff according to Equation (5). In our experiments, the widths of the ion cloud were in the range of 330-350 μm and those of the electron beam were in the range of 280-300 μm at all magnetic fields, as a result of the noncompression of the electron beam by the magnetic field in the SH-HtscEBIT (Tu et al 2017b).…”

Section: Electron Densitymentioning

confidence: 58%

First Laboratory Measurement of Magnetic-field-induced Transition Effect in Fe x at Different Magnetic Fields

Yan

et al. 2022

ApJ

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The magnetic field is extremely important for understanding the properties of the solar corona. However, there are still difficulties in the direct measurement of the coronal magnetic field. The magnetic-field-induced transition (MIT) in Fe x, appearing in coronal spectra, was discovered to have prospective applications in coronal magnetic field measurements. In this work, we obtained the extreme ultraviolet spectra of Fe x in the wavelength range of 174–267 Å in the Shanghai High-temperature Superconducting Electron Beam Ion Trap, and examined the effect of MIT in Fe x by measuring the line ratios between 257.262 Å and the reference line of 226.31 Å (257/226) at different magnetic field strengths for the first time. The electron density that may affect the 257/226 value was also obtained experimentally and verified by comparing the density-sensitive line ratio (175.266 Å/174.534 Å) measurements with the theoretical predictions, and there was good agreement between them. The energy separation between the two levels of 3s23p43d 4 D 5/2 and 3s23p43d 4 D 7/2, one of the most critical parameters for determining the MIT rate, was obtained by analyzing the simulated line ratios of 257/226 with the experimental values at the given electron densities and magnetic fields. Possible reasons that may have led to the difference between the obtained energy splitting and the recommended value in previous works are discussed. Magnetic field response curves for the 257/226 value were calculated and compared to the experimental results, which is necessary for future MIT diagnostics.

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Characteristics of the Shanghai high-temperature superconducting electron-beam ion trap and studies of the space-charge effect under ultralow-energy operating conditions

Cited by 8 publications

References 29 publications

Observation of indirect ionization of W7+ in an electron-beam ion-trap plasma

Observation of indirect ionization of W7+ in an electron-beam ion-trap plasma

A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions

First Laboratory Measurement of Magnetic-field-induced Transition Effect in Fe x at Different Magnetic Fields

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