Ultrafast X-ray Thomson Scattering of Shock-Compressed Matter

Kritcher, Andrea; Neumayer, P.; Castor, J.; Döppner, T.; Falcone, R. W.; Landen, O. L.; Lee, Hae Ja; Lee, Richard W.; Morse, Edward; Ng, A.; Pollaine, S. M.; Price, D.; Glenzer, S. H.

doi:10.1126/science.1161466

Cited by 181 publications

(131 citation statements)

References 22 publications

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“…Employing K-alpha probe radiation both the high temporal resolution and the satellite-free red wing in the spectrum enabled to clearly resolve the emergence of the plasmon resonance in coalescing shock experiments. 6 All these unique properties make K-alpha sources the backlighter of choice for high rho-r plasmas such as shock-compressed solid density targets or the compressed fusion fuel in inertial confinement fusion ͑ICF͒ experiments. To provide the large photon numbers required for these applications, current highenergy density producing laser facilities have been or will be upgraded to feature multikilojoule short-pulse drive lasers.…”

Section: Introductionmentioning

confidence: 99%

The role of hot electron refluxing in laser-generated K-alpha sources

Neumayer¹,

Aurand²,

Basko³

et al. 2010

Physics of Plasmas

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A study of the contribution of refluxing electrons in the production of K-alpha radiation from high-intensity laser irradiated thin targets has been performed. Thin copper foils both freestanding, and backed by a thick substrate were irradiated with laser pulses of energies around 100 J at intensities ranging from below 1017 to above 1019 W/cm2. At high laser intensities we find a strong reduction in the K-alpha yield from targets backed by the substrate. The observed yield reduction is in good agreement with a simple model using hot electron spectra from particle-in-cell simulations or directly inferred from the measured bremsstrahlung emission and can therefore be interpreted as due to the suppression of hot electron refluxing. The study shows that refluxing electrons play a dominant role in high-intensity laser driven K- alpha generation and have to be taken into account in designing targets for laser driven high-flux K-alpha sources.

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Section: Introductionmentioning

confidence: 99%

The role of hot electron refluxing in laser-generated K-alpha sources

Neumayer¹,

Aurand²,

Basko³

et al. 2010

Physics of Plasmas

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“…The availability of intense lasers makes it nowadays possible to investigate WDM in the laboratory by x-ray scattering [4][5][6][7]. The interpretation of the x-ray scattering signal and its application as diagnostics need, however, theoretical input for the structural properties of WDM.…”

Section: Introductionmentioning

confidence: 99%

Ion structure in warm dense matter: Benchmarking solutions of hypernetted-chain equations by first-principle simulations

2009

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We investigate the microscopic structure of strongly coupled ions in warm dense matter using ab initio simulations (DFT-MD) and hypernetted chain equations (HNC). We demonstrate that an approximate treatment of quantum effects by weak pseudo-potentials fails to describe the highly degenerate electrons in warm dense matter correctly. However, one component HNC calculations for the ions agree well with first principle simulations if a linearly screened Coulomb potential is used. These HNC results can be further improved by adding a short range repulsion that accounts for bound electrons. Examples are given for recently studied light elements, Lithium and Beryllium, and for Aluminum where the extra short-range repulsion is essential.

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“…Indeed, Kritcher et al [12] have assumed that, in LiH mixtures, the correlations are essentially determined by the Li ions with the hydrogen playing no significant role. As discussed in Ref.…”

mentioning

confidence: 99%

“…Picosecond and subpicosecond probes are thus required to observe snapshots in time of any significant change in the ionic correlations. Very recently, picosecond laser produced K sources in spectrally resolved experiments have been used to investigate the insulator-to-metal phase transition in LiH [12]. In this work, we have instead implemented a novel ultrafast K source for angularly resolved scattering to measure the formation of short-range order at distances of a few Bohr radii as a result of strong coupling between the ions and the electrons.…”

mentioning

confidence: 99%