A study of ion-dynamics and correlation effects for spectral line broadening in plasma: K-shell lines

Stambulchik, E.; Maron, Y.

doi:10.1016/j.jqsrt.2005.05.058

Cited by 75 publications

(70 citation statements)

References 23 publications

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“…In practice, the relative contribution for each transition to the overall line profile is calculated, and the results are compared to the experimental lineshapes. An example is shown in Figure 16 for two different electron temperatures at a constant N e of 1x10 16 cm -3 (reasonable for these experiments). The relative contributions of each of the CIII and CIV transitions are calculated and compared with the normalized experimental line profile.…”

Section: B Electron Temperature Determinationssupporting

confidence: 70%

“…These time dependencies introduce small correction factors to the steady-state calculations, which will be neglected for the purpose of this report. Table 6 shows the results for the case of neutral hydrogen at two temperatures with N i = 1x10 16 cm -3 and a plasma length of 1.5cm. Table 7 shows the same calculations for a factor of three increase in total ion density.…”

Section: B Electron Temperature Determinationsmentioning

confidence: 99%

“…Future x-ray source requirements require a three-fold focal intensity increase. To achieve this, recent work [1,2] suggests that replacing the gas with a highly conductive, pre-ionized plasma (~10 16 cm -3 and ~5eV) enhances the time-averaged beam intensity on target. As yet, no viable source has been developed.…”

mentioning

confidence: 99%

“…As yet, no viable source has been developed. Based on theoretical calculations for the ablation rates of z-pinch wire arrays [4,5], it is suggested that a properly tailored, over-massed wire array driven with a low current (~100kA), long pulse (~500ns) should produce a stable, on-axis plasma column with densities of ~10 16 cm -3 for a few hundred nanoseconds, which is sufficient for radiographic applications. This LDRD project was the first attempt to generate such a plasma source from fine metal wires and to understand to what degree a volumetric plasma source can be created, controlled, and maintained for several hundreds of nanoseconds.…”

mentioning

confidence: 99%

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Volumetric plasma source development and characterization.

Crain

Maron

Oliver

et al. 2008

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The development of plasma sources with densities and temperatures in the 10 15 -10 17 cm -3 and 1-10eV ranges which are slowly varying over several hundreds of nanoseconds within several cubic centimeter volumes is of interest for applications such as intense electron beam focusing as part of the x-ray radiography program. In particular, theoretical work [1,2] suggests that replacing neutral gas in electron beam focusing cells with highly conductive, pre-ionized plasma increases the time-averaged e-beam intensity on target, resulting in brighter x-ray sources. This LDRD project was an attempt to generate such a plasma source from fine metal wires. A high voltage (20-60kV), high current (12-45kA) capacitive discharge was sent through a 100μm diameter aluminum wire forming a plasma. The plasma's expansion was measured in time and space using spectroscopic techniques. Lineshapes and intensities from various plasma species were used to determine electron and ion densities and temperatures. Electron densities from the mid-10 15 to mid-10 16 cm -3 were generated with corresponding electron temperatures of between 1 and 10eV. These parameters were measured at distances of up to 1.85 cm from the wire surface at times in excess of 1μs from the initial wire breakdown event. In addition, a hydrocarbon plasma from surface contaminants on the wire was also measured. Control of these contaminants by judicious choice of wire material, size, and/or surface coating allows for the ability to generate plasmas with similar density and temperature to those given above, but with lower atomic masses.

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Section: B Electron Temperature Determinationssupporting

confidence: 70%

Section: B Electron Temperature Determinationsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Volumetric plasma source development and characterization.

Crain

Maron

Oliver

et al. 2008

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“…The MD simulations in conjunction with the Schrödinger equation to study the line shapes in a TCP have been previously considered in Ref. [19]. Our model is thus similar to that considered in [19] but, in addition, it allows to treat the interaction of the emitted photons with radiating electron.…”

Section: Introductionmentioning

confidence: 99%

Microfield Fluctuations and Spectral Line Shapes in Strongly Coupled Two–Component Plasmas

Nersisyan

Toepffer

Zwicknagel

2010

Contrib. Plasma Phys.

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The spectral line shapes for hydrogen-like heavy ion emitters embedded in strongly correlated two-component electron-ion plasmas are investigated with numerical simulations. For that purpose the microfield fluctuations are calculated by molecular dynamics simulations where short range quantum effects are taken into account by using a regularized Coulomb potential for the electronion interaction. The microfield fluctuations are used as input in a numerical solution of the timedependent Schrödinger equation for the radiating electron. In distinction to the standard impact and quasistatic approximations the method presented here allows to account for the correlations between plasma ions and electrons. The shapes of the Lyα-line in Al are investigated in the intermediate regime. The calculations are in good agreement with experiments on the Lyα-line in laser generated plasmas.

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Radiation transport and density effects in non-equilibrium plasmas

Fisher

Maron

2007

High Energy Density Physics

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A study of ion-dynamics and correlation effects for spectral line broadening in plasma: K-shell lines

Cited by 75 publications

References 23 publications

Volumetric plasma source development and characterization.

Volumetric plasma source development and characterization.

Microfield Fluctuations and Spectral Line Shapes in Strongly Coupled Two–Component Plasmas

Radiation transport and density effects in non-equilibrium plasmas

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