Radiation transport and density effects in non-equilibrium plasmas

Fisher, V.; Fisher, D.; Maron, Y.

doi:10.1016/j.hedp.2007.02.020

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…The properties of the stagnating plasma are obtained from the measurements described above with the aid of the following modeling [12]: the stagnating plasma is assumed to be a uniform cylinder with a radius R(t), an electron density n e (t), and an electron temperature T e (t). Our timedependent collisional-radiative calculations account for the radiation transport self-consistently.…”

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confidence: 99%

Ion Temperature and Hydrodynamic-Energy Measurements in aZ-Pinch Plasma at Stagnation

et al. 2011

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The time history of the local ion kinetic energy in a stagnating plasma was determined from Doppler-dominated line shapes. Using independent determination of the plasma properties for the same plasma region, the data allowed for inferring the time-dependent ion temperature, and for discriminating the temperature from the total ion kinetic energy. It is found that throughout most of the stagnation period the ion thermal energy constitutes a small fraction of the total ion kinetic energy; the latter is dominated by hydrodynamic motion. Both the ion hydrodynamic and thermal energies are observed to decrease to the electron thermal energy by the end of the stagnation period. It is confirmed that the total ion kinetic energy available at the stagnating plasma and the total radiation emitted are in balance, as obtained in our previous experiment. The dissipation time of the hydrodynamic energy thus appears to determine the duration (and power) of the K emission.

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confidence: 99%

Ion Temperature and Hydrodynamic-Energy Measurements in aZ-Pinch Plasma at Stagnation

et al. 2011

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“…(8)(9)(10)(11) has two important properties: (i) it gives the correct quasistatic width in the high-density/lowtemperature limit and (ii) reproduces the expected T -and N p -dependences in the lowdensity/high-temperature impact limit [5],…”

Section: Methodsmentioning

confidence: 91%

“…The calculations are very fast, therefore, it becomes practical to incorporate them, into non-LTE plasma kinetics codes (e.g., [10,11]), compromising neither accuracy nor computational resources required. Furthermore, the computational time is independent of the principal quantum numbers of the transitions involved, therefore, the method can be easily applied to such complex phenomena as merging of the discrete and continuum spectra and ionization potential lowering due to plasma effects.…”

Section: Examples and Applicationsmentioning

confidence: 99%

Quasi-contiguous approximation for line-shape modeling in plasmas

Stambulchik¹,

Maron²

2012

AIP Conference Proceedings

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We present an analytical method for the calculation of shapes of Stark-broadened spectral lines in plasmas, applicable to hydrogen and hydrogen-like transitions (including Rydberg ones). The method is based on the recently suggested quasi-contiguous approximation of the static Stark line shapes [E. Stambulchik, and Y. Maron, J. Phys. B: At. Mol. Opt. Phys. 41, 095703 (2008)], while the dynamical effects are accounted for using the frequency-fluctuation-model approach. Comparisons with accurate computer simulations show excellent agreement.

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“…1. Calculated spectrum of the Al III 4se4p doublet with n e ¼ 10 17 cm À3 , T e ¼ 3 eV, B ¼ 6.5 T, and an instrumental resolution of 0.5 Å. at 5722 Å was 1.0 Â 10 À2 Collisional radiative (C-R) [4,5] modeling calculated an electron temperature of 4 eV for this line ratio. Therefore, we concluded that the plasmas electron temperature was 4 eV or greater for these two spectra.…”

Section: Shown Inmentioning

confidence: 89%