High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser

Wollenweber, L.; Preston, Thomas R.; Descamps, Adrien; Cerantola, Valerio; Comley, A. J.; Eggert, J. H.; Fletcher, L. B.; Geloni, Gianluca; Gericke, Dirk O.; Glenzer, S. H.; Göde, S.; Hastings, J. B.; Humphries, Oliver; Jenei, A.; Karnbach, O.; Konôpková, Zuzana; Loetzsch, R.; Marx-Glowna, Berit; McBride, E. E.; McGonegle, David; Monaco, G.; Ofori-Okai, Benjamin K.; Palmer, C. A. J.; Plückthun, Christian; Redmer, R.; Strohm, C.; Thorpe, Ian; Tschentscher, Th.; Uschmann, I.; Wark, J. S.; White, Thomas G.; Appel, Karen; Gregori, G.; Zastrau, U.

doi:10.1063/5.0022886

Cited by 23 publications

(12 citation statements)

References 53 publications

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“…The second pair of the Si( 111)-monochromator can be replaced with a Si(533) channel-cut crystal, yielding a bandwidth of ÁE/E ' 4 Â 10 À6 at a fixed photon energy of 7494 eV. More details are given by Wollenweber et al (2021). Both configurations provide zero offset between the incident and the monochromated beam.…”

Section: Monochromatorsmentioning

confidence: 99%

“…As shown in Fig. 18, this is sufficient to resolve inelastic X-ray scattering from phonons in solids, or ion-acoustic waves in plasmas (Wollenweber et al, 2021;Descamps et al, 2020).…”

Section: Interaction Chambermentioning

confidence: 99%

“…For diamond, the peaks correspond to phonon creation and annihilation. The spectrum is reproduced from Wollenweber et al (2021).…”

Section: Figure 18mentioning

confidence: 99%

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The High Energy Density Scientific Instrument at the European XFEL

Zastrau¹,

Appel²,

Baehtz³

et al. 2021

J Synchrotron Rad

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The European XFEL delivers up to 27000 intense (>1012 photons) pulses per second, of ultrashort (≤50 fs) and transversely coherent X-ray radiation, at a maximum repetition rate of 4.5 MHz. Its unique X-ray beam parameters enable groundbreaking experiments in matter at extreme conditions at the High Energy Density (HED) scientific instrument. The performance of the HED instrument during its first two years of operation, its scientific remit, as well as ongoing installations towards full operation are presented. Scientific goals of HED include the investigation of extreme states of matter created by intense laser pulses, diamond anvil cells, or pulsed magnets, and ultrafast X-ray methods that allow their diagnosis using self-amplified spontaneous emission between 5 and 25 keV, coupled with X-ray monochromators and optional seeded beam operation. The HED instrument provides two target chambers, X-ray spectrometers for emission and scattering, X-ray detectors, and a timing tool to correct for residual timing jitter between laser and X-ray pulses.

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Section: Monochromatorsmentioning

confidence: 99%

“…As shown in Fig. 18, this is sufficient to resolve inelastic X-ray scattering from phonons in solids, or ion-acoustic waves in plasmas (Wollenweber et al, 2021;Descamps et al, 2020).…”

Section: Interaction Chambermentioning

confidence: 99%

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The High Energy Density Scientific Instrument at the European XFEL

Zastrau¹,

Appel²,

Baehtz³

et al. 2021

J Synchrotron Rad

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“…namic experiments: at the IXS commissioning experiment of the High Energy Density (HED) end-station of the EuXFEL, the instrument function was on the order of 50 meV 97 -this has been and will continue to be further improved upon in the future at both the EuXFEL and LCLS. While the influence of the instrument function on the scattering signal is in principle deconvolvable, shot noise poses a limit due to finite integration time at experiments.…”

Section: B Qes and Energy Resolutionmentioning

confidence: 99%

“…As noted above, FELs have an enormous peak spectral brightness. Indeed, recent work on both the Linac Coherent Light Source (LCLS) 95 and at the European XFEL (EuXFEL) 96,97 has demonstrated inelastic scattering from static, unshocked samples of almost perfect diamond single crystals. The temperature of samples at both ambient and elevated levels could be determined with an error of less than 8%.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of inelastic x-ray scattering from shocked copper

Karnbach

Heighway

McGonegle

et al. 2021

Journal of Applied Physics

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By taking the spatial and temporal Fourier transforms of the coordinates of the atoms in molecular dynamics simulations conducted using an embedded-atom-method potential, we calculate the inelastic scattering of x-rays from copper singlecrystals shocked along [001] to pressures of up to 70 GPa. Above the Hugoniot elastic limit (HEL), we find that the copious stacking faults generated at the shock front introduce strong quasi-elastic scattering (QES) that competes with the inelastic scattering signal, which remains discernible within the first Brillouin zone; for specific directions in reciprocal space outside the first zone, the QES dominates the inelastic signal overwhelmingly. The synthetic scattering spectra we generate from our Fourier transforms suggest that energy resolutions of order 10 meV would be required to distinguish inelastic from quasi-elastic scattering within the first Brillouin zone of shock-loaded copper. We further note that high-resolution inelastic scattering also affords the possibility of directly measuring particle velocities via the Doppler shift. These simulations are of relevance to future planned inelastic scattering experiments at x-ray Free Electron Laser (FEL) facilities.

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