A5024661450- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Laser Design and Applications
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- Laser Material Processing Techniques
- Advanced X-ray Imaging Techniques
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Particle accelerators and beam dynamics
- Pulsed Power Technology Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Laser-Ablation Synthesis of Nanoparticles
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- Diamond and Carbon-based Materials Research
- Muon and positron interactions and applications
- Particle Dynamics in Fluid Flows
Czech Technical University in Prague
2016-2025
Extreme Light Infrastructure Beamlines
2019-2025
Czech Academy of Sciences, Institute of Physics
2013-2022
Czech Academy of Sciences
2015-2021
Prokhorov General Physics Institute
2016-2020
National Institutes for Quantum Science and Technology
2020
National Taiwan University
2020
Czech Academy of Sciences, Institute of Plasma Physics
2013-2019
Xi'an Jiaotong University
2019
Kansai Photon Science Institute
2016
Acceleration of ions from ultrathin foils irradiated by intense circularly polarized laser pulses is investigated using one- and two-dimensional particle simulations. A wave heats the electrons much less efficiently than linear polarization ion acceleration process takes place on front side foil. The ballistic evolution foil becomes important after all contained in have been accelerated. In ongoing process, whole accelerated as a dense compact bunch quasineutral plasma implying that energy...
Nanostructured thin plastic foils have been used to enhance the mechanism of laser-driven proton beam acceleration. In particular, presence a monolayer polystyrene nanospheres on target front side has drastically enhanced absorption incident 100 TW laser beam, leading consequent increase in maximum energy and charge. The cutoff increased by about 60% for optimal spheres' diameter 535 nm comparison planar foil. total number protons with energies higher than 1 MeV was approximately 5 times. To...
ELI-Beamlines (ELI-BL), one of the three pillars Extreme Light Infrastructure endeavour, will be in a unique position to perform research high-energy-density-physics (HEDP), plasma physics and ultra-high intensity (UHI) (1022W/cm2) laser–plasma interaction. Recently need for HED laboratory was identified P3 (plasma platform) installation under construction ELI-BL an answer. The 10 PW laser makes possible fundamental topics from high-field new extreme states matter such as radiation-dominated...
The interaction of laser pulses with thin grating targets, having a periodic groove at the irradiated surface, is experimentally investigated. Ultrahigh contrast ($\ensuremath{\sim}{10}^{12}$) allow us to demonstrate an enhanced laser-target coupling for first time in relativistic regime ultrahigh intensity $>{10}^{19}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$. A maximum increase by factor 2.5 cutoff energy protons produced target normal sheath acceleration observed respect plane around...
The paper presents theoretical analysis and experimental results concerning the major physical issues in shock-ignition approach. These are following: generation of a high amplitude shock imploding target, laser–plasma interaction physics under conditions laser intensities needed for excitation, symmetry stability propagation, role fast electrons symmetrization pressure fuel preheat. models numerical simulations compared with specially designed experiments on plasma excitation plane...
The interaction of an ultrashort intense laser pulse with thin foil targets is accompanied by the acceleration ions from target surface. To make this ion source suitable for application, it particular importance to increase efficiency energy transformation into accelerated and maximum energy. This can be achieved using a microscopic structure on front, laser-irradiated influence surface subsequent studied here numerical simulations. shape size microstructure, density profile incidence angle...
Numerical simulations of the laser pulse interaction with an inhomogeneous, large size, high temperature plasma are presented. The intensity, 1016 W cm−2, temperature, 5 keV, and density scale length 300 µm correspond to conditions shock ignition scenario. It is demonstrated that after a short initial burst backscattering, significant part incident radiation absorbed in underdense energy transported dense by electrons energies 20–40 keV. absorption mechanism associated self-organized...
The dynamics of an electron bunch irradiated by two focused colliding super-intense laser pulses and the resulting γ e(-)e(+) production are studied. Due to attractors in a standing wave created photon emission pair production, general, more efficient with linearly polarized than circularly ones. dependence key parameters on intensity wavelength allows us identify conditions for cascade development γe(-)e(+) plasma creation.
Abstract The new generation of laser facilities is expected to deliver short (10 fs–100 fs) pulses with 10–100 PW peak power. This opens an opportunity study matter at extreme intensities in the laboratory and provides access physics. Here we propose scatter GeV-class electron beams from laser-plasma accelerators a multi-PW normal incidence. In this configuration, one can both create accelerate electron-positron pairs. particles are generated focus gain relativistic momentum direction...
Abstract The intensities of the order 10 23–24 W/cm 2 are required to efficiently generate electron-positron pairs in laser-matter interaction when multiple laser beam collision is employed. To achieve such intense fields with upcoming generation PW beams, focusing sub-micron spot size required. In this paper, possibility pair production cascade development studied for case a standing wave created by two tightly focused colliding pulses. Even though stronger ponderomotive force expels seed...
Abstract Electron–positron pair production via Breit–Wheeler process requires laser intensities approaching 10 24 W cm −2 due to the small cross-section. Here, we propose a mechanism for brilliant γ -ray emission and dense GeV pairs creation accompanied with high-harmonic generation by using plasma mirror an ultra short pulse intensity of 3 × 23 . The is reflected solid surface after propagating tens microns in near-critical density breaks into wave packets. high order harmonic field...
Improvement of energy-conversion efficiency from laser to proton beam is demonstrated by particle simulations in a laser-foil interaction. When an intense short-pulse illuminates the thin-foil target, foil electrons are accelerated around target ponderomotive force. The hot generate strong electric field, which accelerates protons, and generated. In this paper multihole proposed order increase protons. multiholes transpiercing help enhance laser-proton significantly. Particle-in-cell...
The shock ignition concept implies laser pulse intensities higher than 1015 W/cm2 (at the wavelength of 351 nm), which is commonly accepted limit where inverse bremsstruhlung absorption dominates. transition from collisional to collisionless in plasma interactions at studied present paper with help large scale one-dimensional particle-in-cell simulations. initial parameters are defined by hydrodynamic simulations corresponding recent experiments. predict that a quasi-steady regime...
Two-plasmon-decay (TPD) instability is investigated for conditions relevant the shock-ignition (SI) scheme of inertial confinement fusion. Two-dimensional particle-in-cell simulations show that in a hot, large-scale plasma, TPD develops concomitance with stimulated Raman scattering (SRS). It active only during first picosecond interaction, and then it rapidly saturated due to plasma cavitation. TPD-excited waves extend small wavelengths, above standard Landau cutoff. The hot electron...
A high-energy, high-yield proton beam with a good homogeneous profile has been generated from nanosphere target irradiated by short (30-fs), intense ($7\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$) laser pulse. maximum energy of 30 MeV observed high number $7\ifmmode\times\else\texttimes\fi{}{10}^{10}$ in the range 5--30 MeV. spatial uniformity (standard deviation an average value within 85% area) 15% is dielectric target. Particle-in-cell...
Laser–plasma interaction (LPI) at intensities $10^{15}{-}10^{16}~\text{W}\cdot \text{cm}^{-2}$ is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes high-energy nonthermal electrons. Such regime paramount importance inertial confinement fusion (ICF) in particular the shock ignition scheme. In this paper we report on an experiment carried out Prague Asterix Laser System (PALS) facility to investigate...
High-energy γ-photon generation via nonlinear Compton scattering and electron–positron pair creation the Breit–Wheeler process driven by laser–plasma interaction are modeled, a number of mechanisms proposed. Owing to small cross section, these processes require both an ultra-intense laser field relativistic electron bunch. The extreme conditions for such scenarios can be achieved through recent developments in technology. Photon emission Thomson has been observed experimentally. positron...
Abstract The ion temperature in laser-heated foam materials can be considerably higher than the electron due to internal collisions of plasma flows originating from heterogeneous microstructure. 
Recently, we have developed a novel hybrid multiscale model for laser-foam interaction that successfully reproduces experimentally measured heat front propagation subcritical foams various densities. However, when applied undercritical with average density closer critical, simulations...
We discuss the inclusion of process multiple ionization atoms in high-intensity electromagnetic fields into particle-in-cell (PIC) codes applied to simulation laser-plasma interactions. The approach is based on application Perelomov-Popov-Terent'yev formulas for rates within paradigm sequential tunnel ionization. analyze difficulties and possible inconsistencies approach, which may cause problems implementation PIC codes. To test sensitivity model variations, we perform simulations an argon...
With the advent of high repetition rate laser facilities, novel diagnostic tools compatible with these advanced specifications are required. This paper presents design an active gamma-ray spectrometer intended for experiments, particular emphasis on functionality within a PW level laser-plasma interaction chamber’s extreme conditions. The uses stacked scintillators to accommodate broad range energies, demonstrating its adaptability various experimental setups. In addition, it has been...
The paper presents an analytical model and particle-in-cell simulations of the quasi-mono-energetic ion acceleration by intense laser pulse in a multispecies target corresponding experimental observations. Homogeneous heterogeneous targets are considered, it is shown that formation energy spectrum proceeds three stages: (1) initial light sheath electric field, (2) species separation followed electrostatic shock formation, (3) interaction spatially separated bunches accompanied electron...
Bremsstrahlung emission from interactions of short ultra-intense laser pulses with solid foils is studied using particle-in-cell (PIC) simulations. A module for simulating bremsstrahlung has been implemented in the PIC loop to self-consistently account dynamics laser–plasma interaction, plasma expansion, and gamma ray photons. This made it possible study thin targets, where refluxing hot electrons plays an important role. It shown that angular distribution emitted photons exhibits a...
Comprehensive understanding and possible control of parametric instabilities in the context inertial confinement fusion (ICF) remains a challenging task. The details absorption processes detrimental effects hot electrons on implosion process require as much effort experimental side theoretical simulation side. This paper describes proposal for studies nonlinear interaction intense laser pulses with high-temperature plasma under conditions corresponding to direct-drive ICF schemes. We propose...
We study the conditions for coherent radiation of an electron bunch driven by a counterpropagating strong pulsed electromagnetic plane wave. derive spectrum and show that it is emitted backward with respect to laser propagation direction has very narrow angular spread. demonstrate solid density plasma extends frequencies up hundreds keV, thereby enhancing low-frequency part many orders magnitude. Our analytical findings are tested three-dimensional particle-in-cell simulations passing...
The shock ignition concept for inertial confinement fusion includes launching a strong with high-intensity laser spike into an imploding shell. intensity in the plasma corona is above threshold parametric instabilities, thus providing conditions non-linear effects. Here we present series of one-dimensional kinetic simulations laser–plasma interactions such regime. After transient period non-stationary scattering, interaction enters asymptotic regime where significant part incident flux...