A5054063011- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Advanced X-ray Imaging Techniques
- Laser Material Processing Techniques
- Diamond and Carbon-based Materials Research
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Surface Polishing Techniques
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Advanced Electron Microscopy Techniques and Applications
- Fullerene Chemistry and Applications
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- Astro and Planetary Science
- Carbon Nanotubes in Composites
- Radiation Therapy and Dosimetry
- Electron and X-Ray Spectroscopy Techniques
- Advanced Chemical Physics Studies
- Advancements in Photolithography Techniques
- Crystallography and Radiation Phenomena
Czech Academy of Sciences, Institute of Physics
2016-2025
University of Turku
2025
Czech Academy of Sciences
2015-2024
Colorado State University
2023
Helmholtz-Zentrum Dresden-Rossendorf
2023
Czech Academy of Sciences, Institute of Plasma Physics
2012-2022
National Research Nuclear University MEPhI
2017-2021
Czech Technical University in Prague
2007-2021
Institute of Plasma Physics and Laser Microfusion
2006-2021
Military University of Technology in Warsaw
2021
The following topics are dealt with: TTF/FLASH in the XFEL context, general layout of facility, accelerator, undulators for SAES and spontaneous emission, photon beamlines scientific instruments, infrastructure auxiliary systems, commissioning operation, project management organization, cost time schedule. (HSI)
We have used the Linac Coherent Light Source to generate solid-density aluminum plasmas at temperatures of up 180 eV. By varying photon energy x rays that both create and probe plasma, observing K-α fluorescence, we can directly measure position K edge highly charged ions within system. The results are found disagree with predictions extensively Stewart-Pyatt model, but consistent earlier model Ecker Kröll, which predicts significantly greater depression ionization potential.
The Prague Asterix Laser System (PALS) is a new international laboratory where research teams are invited to compete for the beam time. PALS Center runs an iodine photodissociation high-power laser system delivering up 1.2 kJ of energy in ∼400 ps pulses at wavelength 1.315 μm. Optional doubling and tripling frequency assured by large-diameter nonlinear crystals. ASTERIX IV [H. Baumhacker et al., Appl. Phys. B 61, 325 (1995)], transferred from Garching into hall Prague, was updated put...
Abstract The effect of a dense plasma environment on the energy levels an embedded ion is usually described in terms lowering its continuum level. For strongly coupled plasmas, phenomenon intimately related to equation state; hence, accurate treatment crucial for most astrophysical and inertial-fusion applications, where case mixtures particular interest. Here we present experiment showing that standard density-dependent analytical models are inadequate describe solid-density plasmas at...
The soft x-ray materials science instrument is the second operational beamline at linac coherent light source free electron laser. operates with a photon energy range of 480-2000 eV and features grating monochromator as well bendable refocusing mirrors. A broad experimental stations may be installed to study diverse scientific topics such as: ultrafast chemistry, surface science, highly correlated systems, matter under extreme conditions, laboratory astrophysics. Preliminary commissioning...
A linear accelerator based source of coherent radiation, FLASH (Free-electron LASer in Hamburg) provides ultra-intense femtosecond radiation pulses at wavelengths from the extreme ultraviolet (XUV; λ<100nm) to soft X-ray (SXR; λ<30nm) spectral regions.25-fs 32-nm were used determine ablation parameters PMMA -poly (methyl methacrylate).Under these irradiation conditions attenuation length and threshold found be (56.9±7.5)nm ~2 mJ•cm -2 , respectively.For a second wavelength 21.7 nm, was...
We present a new technique for the characterization of non-Gaussian laser beams which cannot be described by an analytical formula.As generalization beam spot area we apply and refine definition so called effective (A eff ) [1] in order to avoid using full-width at half maximum (FWHM) parameter is inappropriate beams.Furthermore, demonstrate practical utilization our femtosecond soft X-ray free-electron laser.The ablative imprints poly(methyl methacrylate) -PMMA amorphous carbon (a-C) are...
We present the x-ray optical design of soft materials science instrument at Linac Coherent Light Source, consisting a varied line-spaced grating monochromator and Kirkpatrick-Baez refocusing optics. Results from commissioning are shown. A resolving power 3000 was achieved, which is within factor two goal.
The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is fundamental parameter that dictates dynamics of systems intermediate high densities. While collision rates well known experimentally in few dilute systems, similar measurements for nonideal plasmas densities approaching or exceeding those solids remain elusive. Here we describe spectroscopic method to study solid-density aluminium created diagnosed using Linac Coherent light Source...
At the recently built FLASH x-ray free-electron laser, we studied reflectivity of Si/C multilayers with fluxes up to 3 x 10(14) W/cm2. Even though nanostructures were ultimately completely destroyed, found that they maintained their integrity and reflectance characteristics during 25-fs-long pulse, no evidence for any structural changes over lengths greater than A. This experiment demonstrates intense ultrafast pulses, damage does not occur giving credence concept diffraction imaging single...
We studied experimentally and theoretically the structural transition of diamond under an irradiation with intense femtosecond extreme ultraviolet laser (XUV) pulse 24--275 eV photon energy provided by free-electron lasers. Experimental results obtained show that irradiated undergoes a solid-to-solid phase to graphite, not amorphous state. Our theoretical findings suggest nature this is nonthermal, stimulated change interatomic potential triggered excitation valence electrons. Ultrashort...
The x-ray intensities made available by free electron lasers (FEL) open up new matter interaction channels not accessible with previous sources. We report here on the resonant generation of Kα emission, that is to say production copious radiation tuning FEL pulse photon energies below K edge a solid aluminum sample. sequential absorption multiple photons in same atom during 80 fs pulse, creating L-shell holes and then one resonantly exciting K-shell into these holes, opens channel for...
We investigated single shot damage of Mo/Si multilayer coatings exposed to the intense fs XUV radiation at Free-electron LASer facility in Hamburg - FLASH. The interaction process was studied situ by reflectometry, time resolved optical microscopy, and "post-mortem" interference-polarizing microscopy (with Nomarski contrast), atomic force scanning transmission electron microcopy. An ultrafast molybdenum silicide formation due enhanced diffusion melted silicon has been determined be key...
By use of high intensity XUV radiation from the FLASH free-electron laser at DESY, we have created highly excited exotic states matter in solid-density aluminum samples. The is sufficiently to excite an inner-shell electron a large fraction atoms focal region. We show that soft-x-ray emission spectroscopy measurements reveal electronic temperature and density this system immediately after excitation pulse, with detailed calculations structure, based on finite-temperature functional theory,...
This paper reports novel measurements of x-ray optical radiation on an absolute scale from the intense and ultra-short generated in soft regime a free electron laser.We give brief description detection principle for which was specifically adapted this photon energy range.We present data characterizing instrument at Linac Coherent Light Source (LCLS) with respect to radiant power output transmission by using detector temporarily placed downstream end instrument.This provides estimation...
The formamide-based synthesis of nucleic acids is considered as a nonaqueous scenario for the emergence biomolecules from inorganic matter. In current study, we scrutinized chemical composition formamide ices mixed with an FeNi meteorite material treated laser-induced dielectric breakdown plasma created in nitrogen buffer gas. These experiments aimed to capture first steps those transformations that may lead formation nucleobases during impact extraterrestrial icy body containing on early...
High-intensity x-ray pulses from an 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 use photodiode. Saturable absorption observed, with resulting differing significantly cold case, in good agreement atomic-kinetics simulations.
Samples of B4C, amorphous C, chemical-vapor-deposition-diamond Si, and SiC were exposed to single 25fs long pulses 32.5nm free-electron-laser radiation at fluences up 2.2J∕cm2. The samples chosen as candidate materials for x-ray optics. It was found that the threshold surface damage is on order fluence required thermal melting. For larger fluences, crater depths correspond temperatures critical temperature, suggesting craters are formed by two-phase vaporization.
We report the first observation of single-shot soft x-ray laser induced desorption occurring below ablation threshold in a thin layer poly (methyl methacrylate) -PMMA.Irradiated by focused beam from Free-electron LASer Hamburg (FLASH) at 21.7nm, samples have been investigated atomic-force microscope (AFM) enabling visualization mild surface modifications caused desorption.A model describing non-thermal and has developed used to analyze imprints PMMA.An intermediate regime materials removal...
X-ray Free Electron Lasers (XFELs) have the potential to contribute many fields of science and enable new avenues research, in large part due their orders magnitude higher peak brilliance than existing future synchrotrons. To best exploit this brilliance, these XFEL beams need be focused appropriate spot sizes. However, survivability optical components intense, femtosecond radiation conditions is not guaranteed. As mirror optics are routinely used at facilities, a physical understanding...
Electron-ion collisional dynamics is of fundamental importance in determining plasma transport properties, nonequilibrium evolution, and electron damage diffraction imaging applications using bright x-ray free-electron lasers (FELs). Here we describe the first experimental measurements ultrafast impact ionization resonant core-hole spectroscopy a solid-density magnesium plasma, created diagnosed with Linac Coherent Light Source FEL. By resonantly pumping 1s→2p transition highly charged ions...