Two-color Thomson scattering at FLASH

Sperling, P.; Thiele, R.; Holst, Bastian; Fortmann, C.; Glenzer, S. H.; Toleikis, S.; Tschentscher, Th.; Redmer, R.

doi:10.1016/j.hedp.2011.04.001

Cited by 13 publications

(8 citation statements)

References 41 publications

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“…Leaving the static ion structure factor S ii (k) as a free fit parameter, an ionization degree Ion feature (brown) in warm dense lithium at T = 4.5 eV and ρ = 0.6 g/cm 3 with the total form factor N (k) (blue), atomic form factor f (k) (red), and the form factor of screening electrons q(k) (green) from DFT-MD simulations (solid line) compared with the values from [27] (boxes) and analytical calculations. The influence of the ionization degree, assuming Z f = 1.0 (dashed line) and Z f = 1.35 (dotted line) is shown within the analytical results using Debye-Hückel theory [55] for q(k) and hydrogen-like wave functions [56] for f (k). We compare also with f (k) for Li + from HartreeFock [57] (dash-dotted).…”

Section: Comparison With Xrts Experiments On Wdmmentioning

confidence: 78%

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

et al. 2017

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We present molecular dynamics simulations based on finite-temperature density functional theory that determine self-consistently the dynamic ion structure factor and the electronic form factor in lithium. Our comprehensive data set allows for the calculation of the dispersion relation for collective excitations, the calculation of the sound velocity, and the determination of the ion feature from the total electronic form factor and the ion structure factor. The results are compared with available experimental x-ray and neutron scattering data. Good agreement is found for both the liquid metal and warm dense matter domain. Finally, we study the impact of possible target inhomogeneities on x-ray scattering spectra.

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Section: Comparison With Xrts Experiments On Wdmmentioning

confidence: 78%

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

et al. 2017

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“…The contribution of bound electrons is given by the ion structure factor S ii weighted by the form factor f i (k) of tightly bound electrons and the screening function q(k) of weakly bound electrons. The screening cloud and the ion structure factor are evaluated via the Debye-Hückel theory, whereas the form factor is approximated using hydrogenic wave functions [40]. Finally, electron ionization during the scattering event is given by the bound-free structure factor S c (k, ω) which is modulated by the ion movement S s [41].…”

Section: Theory Of the Dynamic Structure Factormentioning

confidence: 99%

X-ray Thomson scattering diagnostics of impact ionization in laser-driven carbon foils

Sperling¹,

Zastrau²,

Toleikis³

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.We have studied the light-matter interaction of ultra-short, intense optical laser fields with thin carbon foils via particle-in-cell simulations. Especially, the influence of additional impact ionization on the density and temperature of the generated plasma and on the corresponding Thomson scattering spectra was investigated which has been found essential for laser intensities I > 10 16 W/cm 2 . We predict a pump-probe experiment at the free electron laser FLASH in order to verify the importance of this effect in the laser-matter interaction on ultra-short time scales and to check our predictions quantitatively.X-ray Thomson scattering diagnostics of impact ionization in laser-driven carbon foils2

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“…For the calculation of the second term in the Chihara formula (2) which characterizes the scattering on bound electrons, we use the atomic form factor f i (k) [24] and the simple Debye-Hückel ion-ion structure factor for point charges [25] S ii (k) = k 2 + κ 2 e k 2 + κ 2 i + κ 2 e (5) with the inverse screening length κ c = e 2 c n c /( 0 k B T c ) for species c = e (electrons) and c = i (ions). In the Debye-Hückel picture, the screening cloud can be given with the electron-ion structure factor by q…”

Section: Theory For the Dynamic Structure Factormentioning

confidence: 99%

Time-resolved Thomson scattering on high-intensity laser-produced hot dense helium plasmas

et al. 2013

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The introduction of brilliant free-electron lasers enables new pump-probe experiments to characterize warm and hot dense matter states, i.e. systems at solid-like densities and temperatures of one to several hundred eV. Such extreme conditions are relevant for high-energy density studies such as, e.g., in planetary physics and inertial confinement fusion. We consider here a liquid helium jet pumped with a high-intensity optical short-pulse laser that is subsequently probed with brilliant soft x-ray radiation. The optical short-pulse laser generates a strongly inhomogeneous helium plasma which is characterized with particle-in-cell simulations. We derive the respective Thomson scattering spectrum based on the Born-Mermin approximation for the dynamic structure factor considering the full density and temperature-dependent Thomson scattering cross section throughout the target. We observe plasmon modes that are generated in the interior of the target and study their temporal evolution. Such pump-probe experiments are promising tools to measure the important plasma parameters density and temperature. The method described here can be applied to various pump-probe scenarios by combining optical lasers, soft x-rays and hard x-ray sources.

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Two-color Thomson scattering at FLASH

Cited by 13 publications

References 41 publications

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

X-ray Thomson scattering diagnostics of impact ionization in laser-driven carbon foils

Time-resolved Thomson scattering on high-intensity laser-produced hot dense helium plasmas

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