Theoretical Modeling of High-Resolution X-ray Spectra Emitted by Tungsten and Molybdenum Ions from Tokamak Plasmas

Syrocki, Ł.; Słabkowska, K.; Węder, E.; Polasik, M.; Rzadkiewicz, J.

doi:10.1007/s10894-020-00231-y

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Similar procedure was used in the evaluation of the statistically averaged transition probabilities. In our earlier calculations [ 7 ] of configuration average energies and rates of a particular line X, we omitted very weak lines whereas in the present work we have taken into account all transitions contributing even marginally to the X‐ray line energies and rates.…”

Section: Resultsmentioning

confidence: 99%

“…Investigations on the careful modelling of high resolution X‐ray spectra emitted by W and Mo ions from tokamak plasmas have been undertaken to determine the changes in the relative emission contributions of these ions during JET discharge. [ 7 ] The theoretical modelling of the X‐ray spectra of laser produced plasmas of Mo has been studied by Shevelko et al [ 8 ] to diagnose the electron temperature of the plasmas.…”

Section: Introductionmentioning

confidence: 99%

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K X‐ray satellite structures of bromine and molybdenum

Natarajan

2020

X-Ray Spectrometry

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The energies and electric dipole rates of Kα X‐ray satellites due to 1s‐2p transitions in bromine and molybdenum with one to five vacancies in the 2p shell and other shells retaining their normal occupation numbers are computed using Multi‐Configuration Dirac Fock wavefunctions with the inclusion of relativistic and quantum electrodynamic corrections. As fully relativistic calculations on all the Kα X‐ray fine structure satellites with multiple spectator vacancies in the 2p shell of elements under consideration, to the best of our knowledge, are reported in this work for the first time, the accuracy of the E1 data is analyzed in terms of the agreement between the rates in the length and velocity forms. While the intensities of the strong electric dipole lines in the various groups of 1s ‐ 2p transitions obey the well established Z dependence, many of the weak transitions vary randomly with Z and an attempt is made in this work to understand the behaviour of the spin‐forbidden and weak electric dipole lines in the KαL n X‐ray satellite structure of Br, Mo, I, and Au. As the number of closely spaced fine structure transitions range from a few to many depending on the spectator vacancies in the 2p shell, the intensity weighed statistical average satellite energies, line strengths and photo‐ionization cross sections are reported to guide in the reliable interpretation of experimental measurements.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

K X‐ray satellite structures of bromine and molybdenum

Natarajan

2020

X-Ray Spectrometry

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“…Ne-like ions, with their fully filled L-shell ground state, exhibit stability across a wide range of plasma temperatures and can emit exceptionally bright X-ray radiation that is easily observable. Consequently, the X-ray spectra emitted by these ions have been exploited for plasma diagnostics in high-temperature plasma, including magnetic confinement fusion [25][26][27][28], inertial confinement fusion [29][30][31], and astrophysical plasma [32][33][34]. For instance, the brightest 3C and 3D lines emitted by the Ne-like Fe ion in the Sun and other stellar coronal spectra offer great potential for diagnosing density and temperature [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

X-ray Line-Intensity Ratios in Neon-like Xenon: Significantly Reducing the Discrepancy between Measurements and Simulations

Huang,

Tang,

Yang

et al. 2024

Applied Sciences

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The X-ray spectra of L-shell transitions in Neon-like Xenon ion (Xe44+) have been precisely measured at the Shanghai Electron-Beam Ion Trap using a high-resolution crystal spectrometer. Focusing on the line-intensity ratio of the 3F {2p6-(2p51/23s1/2)J=1} and 3D {2p6-(2p53/23d5/2)J=1} lines (3F/3D), our measurements have achieved remarkable precision improvements over the previous studies. These spectra have been simulated using the collisional-radiative model (CRM) within the Flexible Atomic Code, showing good agreement with the measurements. The previously reported discrepancies, approximately ranging from 10% to 20%, have been significantly reduced in this work to below 1.4% for electron-beam energies exceeding 6 keV and to around 7% for lower energies. Furthermore, our analysis of population fluxes of the involved levels reveals a very high sensitivity of the 3F line to radiation cascades. This suggests that the current CRM, which conventionally excludes interionic population transfer processes, may underestimate the population of the upper level of the 3F line and the cascade-related higher levels, thus explaining the remaining discrepancies. These findings provide a solid foundation for further minimizing these discrepancies and are crucial for understanding the atomic structure and plasma model of these ions.

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