A space-resolved extreme ultraviolet spectrometer for radial profile measurement of tungsten ions in the Experimental Advanced Superconducting Tokamak

Zhang, Ling; Morita, S.; Wu, Zhenwei; Xu, Zong; Yang, Xiaodong; Cheng, Yunxin; Zang, Qing; Liu, Haiqing; Liu, Yong; Zhang, Hongming; Ohishi, T.; Chen, Ying‐Jie; Xu, Liqing; Wu, Cong-Feng; Duan, Yanmin; Gao, Wei; Huang, J.; Gong, Xianzu; Hu, Liqun

doi:10.1016/j.nima.2018.11.082

Cited by 37 publications

(41 citation statements)

References 35 publications

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“…The plasma current profile and q profile are obtained by using the Faraday rotation angle measured by POINT as additional constraint in EFIT code ( 45 ). EUV spectrometer system is used to measure different impurity in the thousand-second pulse and provides the space-resolved information of impurity ( 46 ). Using soft x-ray (SXR) system ( 47 ), the location of MHD is accurately determined.…”

Section: Methodsmentioning

confidence: 99%

Realization of thousand-second improved confinement plasma with Super I-mode in Tokamak EAST

et al. 2023

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Mastering nuclear fusion, which is an abundant, safe, and environmentally competitive energy, is a great challenge for humanity. Tokamak represents one of the most promising paths toward controlled fusion. Obtaining a high-performance, steady-state, and long-pulse plasma regime remains a critical issue. Recently, a big breakthrough in steady-state operation was made on the Experimental Advanced Superconducting Tokamak (EAST). A steady-state plasma with a world-record pulse length of 1056 s was obtained, where the density and the divertor peak heat flux were well controlled, with no core impurity accumulation, and a new high-confinement and self-organizing regime (Super I-mode = I-mode + e-ITB) was discovered and demonstrated. These achievements contribute to the integration of fusion plasma technology and physics, which is essential to operate next-step devices.

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Section: Methodsmentioning

confidence: 99%

Realization of thousand-second improved confinement plasma with Super I-mode in Tokamak EAST

et al. 2023

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“…[5][6][7][8][9] Plenty of emission lines from highly charged Ar XV ions have been observed and applied in astrophysical, tokamak and other laboratory plasmas. [7,[10][11][12][13][14][15][16][17][18] For example, the line intensity ratios and line widths of Ar XV ion were used to diagnose plasma level population and electron density. [19] The line widths of Ar XV ions are also required in spectrum simulations.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of electron-impact broadening for highly charged Ar XV ion lines

Gao

Zhu

et al. 2023

Chinese Phys. B

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Spectral line widths produced by collisions between charged particles and emitters are of special interest for precise plasma spectroscopy. The highly charged Ar XV ion is demonstrated to have strong intrashell electron interactions, which manifest as an atomic system with many resonance structures, due to the quasi-degeneracy of orbital energies. In this paper, we use the relativistic R-matrix method to investigate the electron-impact broadening of highly charged Ar XV ion spectral lines under the impact approximation. It is found that the results with considering resonance structures are significantly different from those of distorted wave approach. Furthermore, we propose a new empirical formula with a correction term to take into account the effect of resonances for electron-impact widths over a relatively wide range of plasma conditions. The corresponding fitting parameters of new empirical formula for all the calculated forty-seven transitions are also given with an estimated accuracy within 1%, which should be convenient for practical applications.

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“…Providing accurate atomic data for these ions is of paramount importance. In the tokamak fusion reactors, such as ITER [2] and EAST, [3,4] tungsten is an element proposed to be used as an erosion-resistant construction material. Therefore, highlycharged tungsten ions are of great interest in fusion plasma research.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

Zhang

Wang

et al. 2023

Chinese Phys. B

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Atomic radiative data such as excitation energies, transition wavelengths, radiative rates, and level lifetimes with high precision are the essential parameters for the abundance analysis, simulation, and diagnostics in fusion and astrophysical plasmas. In this work, we mainly focus on reviewing our two projects performed in the past decade. One is about the ions with Z ≲ 30 that are generally of astrophysical interest, and the other one is about the highly charged krypton (Z = 36) and tungsten (Z = 74) ions that are relevant in research of magnetic confinement fusion. Two different and independent methods, namely, multiconfiguration Dirac–Hartree–Fock (MCDHF) and the relativistic many-body perturbation theory (RMBPT) are usually used in our studies. As a complement/extension to our previous works for highly charged tungsten ions with open M-shell and open N-shell, we also mainly focus on presenting and discussing our complete RMBPT and MCDHF calculations for the excitation energies, wavelengths, electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transition properties, and level lifetimes for the lowest 148 levels belonging to the 3l 3 configurations in Al-like W61+. We also summarize the uncertainties of our systematical theoretical calculations, by cross-checking/validating our datasets from our RMBPT and MCDHF calculations, and by detailed comparisons with available accurate observations and other theoretical calculations. The data are openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.10569.

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A space-resolved extreme ultraviolet spectrometer for radial profile measurement of tungsten ions in the Experimental Advanced Superconducting Tokamak

Cited by 37 publications

References 35 publications

Realization of thousand-second improved confinement plasma with Super I-mode in Tokamak EAST

Realization of thousand-second improved confinement plasma with Super I-mode in Tokamak EAST

Theoretical study of electron-impact broadening for highly charged Ar XV ion lines

Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

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