Spectra of resonance lines of H-like ions in an optically dense plasma

Derzhiev, V. I.; Zhidkov, A G; Maĭorov, S. A.; Chekmezov, A. N.; Yakovlenko, S. I.

doi:10.1070/qe1990v020n03abeh005629

Cited by 3 publications

(7 citation statements)

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“…If the charge state distribution of ions is known, the losses due to bremsstrahlung can be determined as [45,47,48]:…”

Section: The Collisional Radiative Modelmentioning

confidence: 99%

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Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches

Oreshkin¹,

Oreshkin²

2021

Plasma Phys. Control. Fusion

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The development of thermal filamentation (TF) instabilities in a current-carrying plasma shell under the action of the plasma self-radiation was analyzed in terms of a small perturbation theory. A stationary collisional radiative model was used to calculate the parameters of the bremsstrahlung, recombination radiation, and spectral line radiation. It has been shown that radiative losses can either enhance or weaken the growth of TF instabilities. The pattern of the effect is governed by the dependence of the energy lost by the plasma due to radiation, Q Rad, on the plasma temperature T. If Q Rad increases slower than ∼T, the radiative losses enhance TF instabilities. In the opposite case, that is when Q Rad increases faster than ∼T, the radiative losses lead to suppression of TF instabilities. When the energy lost due to radiation is greater than the Joule energy input, TF instabilities can be completely stabilized due to radiation. The plasma parameter ranges for which stabilization of TF instabilities may occur due to radiation have been found for aluminum and argon.

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“…If the charge state distribution of ions is known, the losses due to bremsstrahlung can be determined as [45,47,48]:…”

Section: The Collisional Radiative Modelmentioning

confidence: 99%

“…i is the density of ions of the kth degree of ionization. The losses due to recombination radiation can be estimated as [45,47,49]:…”

Section: The Collisional Radiative Modelmentioning

confidence: 99%

Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches

Oreshkin¹,

Oreshkin²

2021

Plasma Phys. Control. Fusion

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“…where n e , n z are the electron concentration and the total concentration of ions with charge z (the index z = 0 corresponds to a neutral atom); Z max is the maximal ion charge accounted for in the model (for Al Z max = 14), h, m, and e are Planck's constant, the mass and the charge of the electron, respectively. The charge composition of the plasma for a given density and temperature is found from the condition for collision-radiation equilibrium (CRE) [25,48,49]. The collisional processes include electronic excitation, de-excitation and ionization, three-particle and dielectron recombination, the radiative processes include spontaneous radiative transitions between the levels and photorecombination.…”

Section: Plasma Absorption Coefficientmentioning

confidence: 99%

Modelling of radiation transfer in low temperature nanosecond laser-induced plasma of Al vapour

Mazhukin¹,

Nossov²,

Smurov³

et al. 2003

J. Phys. D: Appl. Phys.

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Gas-dynamical expansion and radiation transfer of Al vapour breakdown plasma induced by nanosecond laser action with an intensity of 109–2 × 1010 W cm−2 at the wavelengths of 1.06, 0.512, and 0.248 µm are modelled. Plasma evolution is described in the approximation of non-stationary radiative gas dynamics in the two-dimensional axially symmetrical formulation. Radiation transfer is found to exert a considerable effect on the evolution of the laser plasma. As the intensity increases, the radiative energy losses also increase, reaching 60% at 2 × 1010 W cm−2, and cause the plasma temperature to be reduced proportionally. The energy escapes mainly through the side and, to a smaller extent, the frontal boundaries, the amount of energy escaping in the direction of the target being negligible. The dependence of plasma processes on the laser wavelength is due to specific features of the absorption mechanisms and the photo-absorption contribution under the action of visible and ultraviolet ranges of radiation. The spectral composition of the escaping radiation differs considerably from that of the equilibrium spectrum and is typical of plasma with a variable optical density. It is possible to take into account the influence of radiation on the plasma characteristics by solving the equation of radiation transfer in the multi-group approximation with several tens of spectral intervals. If the maximum available number of groups is used for selected spectrum intervals, the computational results can be compared to the experimental data of plasma emission.

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“…The probability of photoionization is determined by the integral over all frequencies exceeding the electron binding energy 0 ω [34]:…”

Section: Photoionization Processmentioning

confidence: 99%

“…Therefore, in balancing of the process, accounting for absorption leads to substitution of the probability of spontaneous transition ij W by the value Θ ij W , where Θ is the escape factor. In spherical geometry domains, the escape factor is defined as [34]: . That is why the escape factor values are usually situated in the interval 1 0 < Θ < .…”

Section: Escape Probability Approximationmentioning

confidence: 99%

Development of comprehensive models for opacities and radiation transport for IFE systems.

Tolkach¹,

Morozov²,

Hassanein³

2003

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Spectra of resonance lines of H-like ions in an optically dense plasma

Cited by 3 publications

References 0 publications

Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches

Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches

Modelling of radiation transfer in low temperature nanosecond laser-induced plasma of Al vapour

Development of comprehensive models for opacities and radiation transport for IFE systems.

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