S. Hüller
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View article: Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams
Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams Open
High-energy laser beams interacting with flowing plasmas can produce a plasma response that leads to deflection of the beam, beam bending. Such beams have usually a speckle structure generated by optical smoothing techniques that reduce th…
View article: Laser-driven ion acceleration in the presence of increasing heating of relativistic electrons at steep overdense plasma interfaces
Laser-driven ion acceleration in the presence of increasing heating of relativistic electrons at steep overdense plasma interfaces Open
The role of the density gradient in the electron acceleration process by intense laser pulses for a plasma profile with a steep interface between vacuum and a strongly overdense plasma is investigated via particle-in-cell simulations with …
View article: Shock formation in flowing plasmas by temporally and spatially smoothed laser beams
Shock formation in flowing plasmas by temporally and spatially smoothed laser beams Open
The cumulative impact of multiple laser speckles on a supersonic plasma flow across optically smoothed laser beams is investigated. The bending of laser beams caused by ponderomotive laser–plasma coupling, together with flow, leads to plas…
View article: Experimental investigation of the interplay between optical and plasma smoothing induced on a laser megajoule beamline
Experimental investigation of the interplay between optical and plasma smoothing induced on a laser megajoule beamline Open
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View article: Multibeam laser–plasma interaction at the Gekko XII laser facility in conditions relevant for direct-drive inertial confinement fusion
Multibeam laser–plasma interaction at the Gekko XII laser facility in conditions relevant for direct-drive inertial confinement fusion Open
Laser–plasma interaction and hot electrons have been characterized in detail in laser irradiation conditions relevant for direct-drive inertial confinement fusion. The experiment was carried out at the Gekko XII laser facility in multibeam…
View article: Frequency chirp effects on stimulated Raman scattering in inhomogeneous plasmas
Frequency chirp effects on stimulated Raman scattering in inhomogeneous plasmas Open
Previous studies have shown that the use of laser bandwidth may mitigate the growth of stimulated Raman scattering (SRS) in laser plasma interaction experiments, in particular, when the spectrum of the driving (or pump) laser is composed o…
View article: On the role of bandwidth in pump and seed light waves for stimulated Raman scattering in inhomogeneous plasmas
On the role of bandwidth in pump and seed light waves for stimulated Raman scattering in inhomogeneous plasmas Open
The effects of incoherence on the three-wave coupling process of backward stimulated Raman scattering (SRS) in inhomogeneous plasmas are investigated theoretically and numerically via a three-wave coupling model. The impact of the plasma w…
View article: Observation and modelling of stimulated Raman scattering driven by an optically smoothed laser beam in experimental conditions relevant for shock ignition
Observation and modelling of stimulated Raman scattering driven by an optically smoothed laser beam in experimental conditions relevant for shock ignition Open
We report results and modelling of an experiment performed at the Target Area West Vulcan laser facility, aimed at investigating laser-plasma interaction in conditions that are of interest for the shock ignition scheme in inertial confinem…
View article: Crossed beam energy transfer between optically smoothed laser beams in inhomogeneous plasmas
Crossed beam energy transfer between optically smoothed laser beams in inhomogeneous plasmas Open
Crossed beam energy transfer, CBET, in high-intensity laser–plasma interaction is investigated for the case of optically smoothed laser beams. In the two approaches to laser-driven inertial confinement fusion experiments, the direct-drive …
View article: Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves
Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves Open
Crossed beam energy transfer, CBET, is investigated by taking into account the speckle structure of smoothed laser beams that overlap in a plasma with an inhomogeneous flow profile. Using the two-dimensional simulation code Harmony, it is …
View article: Modeling of laser ponderomotive self-focusing in plasma within the paraxial complex geometrical optics approach
Modeling of laser ponderomotive self-focusing in plasma within the paraxial complex geometrical optics approach Open
Laser ponderomotive self-focusing in an underdense homogeneous plasma is studied within the Paraxial Complex Geometrical Optics (PCGO) approach implemented in a hydrodynamic code in 2D planar geometry. The self-focusing of a PCGO Gaussian …
View article: On the non-thermal nature of distributions of electrons accelerated by high intensity lasers at the vacuum-plasma interface
On the non-thermal nature of distributions of electrons accelerated by high intensity lasers at the vacuum-plasma interface Open
The distribution function of electrons accelerated by intense laser pulses at steep vacuum-plasma interfaces is investigated by using the Fokker-Planck equation and methods from extreme statistics. The energy spectrum of electrons penetrat…
View article: Enhancement and control of laser wakefields via a backward Raman amplifier
Enhancement and control of laser wakefields via a backward Raman amplifier Open
The Backward Raman Amplifier (BRA) is proposed as a possible scheme for improving laser driven plasma wakefields. One- and two-dimensional particle-in-cell code simulations and a 3-Wave coupling model are presented and compared to demonstr…
View article: Polarization modification of a spatially randomized picosecond-pulse beam during its amplification by a nanosecond pump
Polarization modification of a spatially randomized picosecond-pulse beam during its amplification by a nanosecond pump Open
Modifications of the spatial distribution of polarization in the focal spot of a picosecond-pulse beam after its amplification by a nanosecond pump in a plasma have been observed experimentally. The spatially resolved measurement of beam p…
View article: Modeling of energy transfer between two crossing smoothed laser beams in a plasma with flow profile
Modeling of energy transfer between two crossing smoothed laser beams in a plasma with flow profile Open
We study the crossed beam energy transfer (CBET) between laser fields generated by optical smoothing methods. The energy transfer, as well as the angular distribution of the outgoing light fields are investigated for two incident smoothed …
View article: Simulation of laser-plasma interaction experiments with gas-filled hohlraums on the LIL facility
Simulation of laser-plasma interaction experiments with gas-filled hohlraums on the LIL facility Open
Laser-plasma interaction is a major issue for achieving ignition in inertial confinement fusion schemes, and still a major concern for the upcoming french laser mégajoule (LMJ) program. In order to mitigate the deleterious effects due to l…
View article: Crossed beam energy transfer: Assessment of the paraxial complex geometrical optics approach versus a time-dependent paraxial method to describe experimental results
Crossed beam energy transfer: Assessment of the paraxial complex geometrical optics approach versus a time-dependent paraxial method to describe experimental results Open
The Crossed Beam Energy Transfer (CBET) of two large laser beams is modeled using two approaches: (i) the time-independent Paraxial Complex Geometrical Optics (PCGO) for stochastically distributed Gaussian-shaped beamlets and (ii) the time…