B. Barbrel
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View article: Electron-Ion Temperature Relaxation in Warm Dense Hydrogen Observed With Picosecond Resolved X-Ray Scattering
Electron-Ion Temperature Relaxation in Warm Dense Hydrogen Observed With Picosecond Resolved X-Ray Scattering Open
Angularly resolved X-ray scattering measurements from fs-laser heated hydrogen have been used to determine the equilibration of electron and ion temperatures in the warm dense matter regime. The relaxation of rapidly heated cryogenic hydro…
View article: Injection of a relativistic electron beam into a high intensity optical lattice
Injection of a relativistic electron beam into a high intensity optical lattice Open
We present a numerical study of the injection and trapping process of a bunch of relativistic free electrons into a transverse high intensity optical lattice. We unravel different injection regimes depending on the characteristic length sc…
View article: Reduction of electron-phonon coupling in warm dense iron
Reduction of electron-phonon coupling in warm dense iron Open
The electron-ion relaxation dynamics in warm dense iron were investigated by time-resolved x-ray absorption near-edge spectroscopy (XANES). A novel analysis, combining ab initio density functional theory (DFT) and two temperature model (TT…
View article: Characterizing the ionization potential depression in dense carbon plasmas with high-precision spectrally resolved x-ray scattering
Characterizing the ionization potential depression in dense carbon plasmas with high-precision spectrally resolved x-ray scattering Open
We discuss here the possibility of obtaining highly precise measurements of the ionization potential depression in dense plasmas with spectrally resolved x-ray scattering, while simultaneously determining the electron temperature and the f…
View article: Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics
Tracking the ultrafast XUV optical properties of x-ray free-electron-laser heated matter with high-order harmonics Open
We present measurements of photon absorption by free electrons as a solid is transformed to plasma. A femtosecond x-ray free-electron laser is used to heat a solid, which separates the electron and ion heating time scales. The changes in a…
View article: Observation of Reverse Saturable Absorption of an X-ray Laser
Observation of Reverse Saturable Absorption of an X-ray Laser Open
A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption. It is a well-known phenomenon in laser physics in the optical regime, but is more difficu…
View article: High resolution x-ray Thomson scattering measurements from cryogenic hydrogen jets using the linac coherent light source
High resolution x-ray Thomson scattering measurements from cryogenic hydrogen jets using the linac coherent light source Open
We present the first spectrally resolved measurements of x-rays scattered from cryogenic hydrogen jets in the single photon counting limit. The 120 Hz capabilities of the LCLS, together with a novel hydrogen jet design [J. B. Kim et al., R…
View article: Kinetic Boltzmann approach adapted for modeling highly ionized matter created by x-ray irradiation of a solid
Kinetic Boltzmann approach adapted for modeling highly ionized matter created by x-ray irradiation of a solid Open
We report on the kinetic Boltzmann approach adapted for simulations of highly ionized matter created from a solid by its x-ray irradiation. X rays can excite inner-shell electrons, which leads to the creation of deeply lying core holes. Th…
View article: Matter under extreme conditions experiments at the Linac Coherent Light Source
Matter under extreme conditions experiments at the Linac Coherent Light Source Open
The Matter in Extreme Conditions end station at the Linac Coherent Light Source (LCLS) is a new tool enabling accurate pump-probe measurements for studying the physical properties of matter in the high-energy density physics regime. This i…
View article: Electronic structure of warm dense silicon dioxide
Electronic structure of warm dense silicon dioxide Open
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View article: The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa)
The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa) Open
We present measurements of the complex ion structure of warm dense carbon close to the melting line at pressures around 100 GPa. High-pressure samples were created by laser-driven shock compression of graphite and probed by intense laser-g…
View article: X-rays only when you want them: optimized pump–probe experiments using pseudo-single-bunch operation
X-rays only when you want them: optimized pump–probe experiments using pseudo-single-bunch operation Open
Laser pump–X-ray probe experiments require control over the X-ray pulse pattern and timing. Here, the first use of pseudo-single-bunch mode at the Advanced Light Source in picosecond time-resolved X-ray absorption experiments on solutions …
View article: Saturable Absorption of an X-Ray Free-Electron-Laser Heated Solid-Density Aluminum Plasma
Saturable Absorption of an X-Ray Free-Electron-Laser Heated Solid-Density Aluminum Plasma Open
High-intensity x-ray pulses from an x-ray free-electron laser are used to heat and probe a solid-density aluminum sample. The photon-energy-dependent transmission of the heating beam is studied through the use of a photodiode. Saturable ab…