A5041263349- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Particle accelerators and beam dynamics
- Laser Material Processing Techniques
- Laser Design and Applications
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Gamma-ray bursts and supernovae
- Cold Atom Physics and Bose-Einstein Condensates
- Pulsed Power Technology Applications
- Orbital Angular Momentum in Optics
- Advanced Optical Sensing Technologies
- Spectroscopy and Laser Applications
- Planetary Science and Exploration
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Spectroscopy Techniques in Biomedical and Chemical Research
Ludwig-Maximilians-Universität München
2011-2025
Schiller International University
2024
Helmholtz Institute Jena
2019-2024
GSI Helmholtz Centre for Heavy Ion Research
2022-2024
Friedrich Schiller University Jena
2024
Peking University
2019
Max Planck Institute of Quantum Optics
2012-2018
European X-Ray Free-Electron Laser
2018
Technical University of Munich
2011
We report experimental evidence for a Rayleigh-Taylor-like instability driven by radiation pressure of an ultraintense (${10}^{21}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$) laser pulse. The is witnessed the highly modulated profile accelerated proton beam produced when irradiates 5 nm diamondlike carbon (90% C, 10% H) target. Clear anticorrelation between bubblelike modulations and transmitted further demonstrate role in modulating foil. Measurements modulation wavelength, acceleration...
Abstract Quantum field theory predicts a nonlinear response of the vacuum to strong electromagnetic fields macroscopic extent. This fundamental tenet has remained experimentally challenging and is yet be tested in laboratory. A particularly distinct signature resulting optical activity quantum birefringence. offers an excellent opportunity for precision test electrodynamics uncharted parameter regime. Recently, operation high-intensity Relativistic Laser at X-ray Free Electron provided by...
Ion beams are relevant for radiobiological studies and tumor therapy. In contrast to conventional accelerators, laser-driven ion acceleration offers a potentially more compact cost-effective means of delivering ions radiotherapy. Here, we show that by combining advanced using nanometer thin targets beam transport, truly nanosecond quasi-monoenergetic proton bunches can be generated with table-top laser system, single shot doses up 7 Gy living cells. Although in their infancy, laser-ion...
We present experimental results on ion acceleration with circularly polarized, ultrahigh contrast laser pulses focused to peak intensities of $5\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{W}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$ onto polymer targets a few 10 nanometer thickness. observed spatially and energetically separated protons carbon ions that accumulate pronounced peaks around 2 MeV containing as much 6.5% the energy. Based particle-in-cell simulation, we...
Often, the interpretation of experiments concerning manipulation energy distribution laser-accelerated ion bunches is complicated by multitude competing dynamic processes simultaneously contributing to recorded signals. Here we demonstrate experimentally acceleration a clean proton bunch. This was achieved with microscopic and three-dimensionally confined near critical density plasma, which evolves from 1 µm diameter plastic sphere, levitated positioned micrometer precision in focus Petawatt...
We report on a target system supporting automated positioning of nano-targets with precision resolution $4~\unicode[STIX]{x03BC}\text{m}$ in three dimensions. It relies confocal distance sensor and microscope. The has been commissioned to position nanometer targets 1 Hz repetition rate. Integrating our prototype into the table-top ATLAS 300 TW-laser at Laboratory for Extreme Photonics Garching, we demonstrate operation 0.5 laser-driven proton source shot-to-shot variation maximum energy...
Spectrally-peaked proton beams of high charge (, , nC ) have been observed from the interaction an intense laser ( W cm−2) with ultrathin CH foils, as measured by spectrally-resolved full beam profiles. These are reproducibly generated for foil thicknesses 5–100 nm, and exhibit narrowing divergence decreasing target thickness down to 5 nm. Simulations demonstrate that narrow energy spread feature is a result buffered acceleration protons. The radiation pressure at front results in asymmetric...
The development from single shot basic laser plasma interaction research toward experiments in which repetition rated laser-driven ion sources can be applied requires technological improvements. For example, the case of radio-biological experiments, irradiation duration and reproducible controlled conditions are important for performing studies with a large number samples. We present advancements recent years at ATLAS 300 Garching near Munich since our last radiation biology experiment....
Laser ion acceleration experiments with increasing repetition rates have become more common in recent years. This allows for the study of stability proton beam parameters and search correlations laser, target, positioning system parameters. We conducted a trial experiment 971 shots determined key using variety optical detectors that are many experimental setups. Our findings can be helpful planning future campaigns assessing relevance certain diagnostics effort to monitor performance improve...
Abstract Radiographic imaging with x-rays and protons is an omnipresent tool in basic research applications industry, material science medical diagnostics. The information contained both modalities can often be valuable principle, but difficult to access simultaneously. Laser-driven solid-density plasma-sources deliver kinds of radiation, mostly single have been explored for applications. Their potential bi-modal radiographic has never fully realized, due problems generating appropriate...
We report on experimental studies of divergence proton beams from nanometer thick diamond-like carbon (DLC) foils irradiated by an intense laser with high contrast. Proton extremely small (half angle) 2 degree are observed in addition a remarkably well-collimated feature over the whole energy range, showing one order magnitude reduction angle comparison to results micrometer targets. demonstrate that this arises steep longitudinal electron density gradient and exponentially decaying...
Abstract The shape of a wave carries all information about the spatial and temporal structure its source, given that medium properties are known. Most modern imaging methods seek to utilize this nature waves originating from Huygens’ principle. We discuss retrieval complete kinetic energy distribution acoustic trace is recorded when short ion bunch deposits in water. This novel method, which we refer as Ion-Bunch Energy Acoustic Tracing (I-BEAT), refinement ionoacoustic approach. With...
We report on experiments irradiating isolated plastic spheres with a peak laser intensity of 2-3×10^{20}Wcm^{-2}. With focal spot size 10 μm full width half maximum (FWHM) the sphere diameter was varied between 520 nm and 19.3 μm. Maximum proton energies ∼25 MeV are achieved for targets matching in or being slightly smaller. For smaller kinetic energy distributions protons become nonmonotonic, indicating change accelerating mechanism from ambipolar expansion towards regime dominated by...
We apply Fourier-transform spectral interferometry (FTSI) to study the interaction of intense laser pulses with ultrathin targets. Ultrathin submicrometer-thick solid CH targets were shot at PHELIX facility an intensity in mid upper 10^{19} W/cm^{2} range using innovative double-pulse structure. The transmitted pulse structure was analyzed by FTSI and shows a transition from relativistic transparency-dominated regime for thinner than 500 nm hole-boring-dominated laser-plasma thicker results...
Modern chirped pulse amplification laser systems with continuously improving controllability and increasing power are about to reach intensities of up $10^{22}~\text{W}~\text{cm}^{-2}$ have proven their potential accelerate ions out plasma several tens percent the speed light. For enabling application, one important step is increase repetition rate at which ion bunches disposal. In particular, techniques used so far for thin foil target production can require days preparing reasonable...
High power short pulse lasers provide a promising route to study the strong field effects of quantum vacuum, for example by direct photon-photon scattering in all-optical regime. Theoretical predictions based on realistic laser parameters achievable today or near future predict few photons with colliding Petawatt pulses, requiring single photon sensitive detection schemes and very good spatio-temporal filtering background suppression. In this article, we present experimental investigations...
We report on a Paul-trap system with large access angles that allows positioning of fully isolated micrometer-scale particles micrometer precision as targets in high-intensity laser-plasma interactions. This paper summarizes theoretical and experimental concepts the apparatus well supporting measurements were performed for trapping process single particles.
The Technological Laboratory of LMU Munich supplies various types solid-state target for laser plasma experiments at the Centre Advanced Laser Applications in Garching. Our main focus here is on production free-standing, thin foil targets, such as diamond-like-carbon foils, carbon nanotube foams (CNFs), plastic, and gold foils. presented methods comprise cathodic arc deposition DLC chemical vapor CNFs, a droplet spin-coating process plastic production, well physical that has been optimized...
Laser-based ion acceleration is driven by electrical fields emerging when target electrons absorb laser energy and consecutively leave the material. A direct correlation between these accelerated ions thus to be expected predicted theoretical models. We report on a modified wide-angle spectrometer allowing simultaneous characterization of angularly resolved distributions both electrons. Equipped with online pixel detectors, RadEye1 investigation this gets attainable single shot basis. In...
We present a versatile and handy method allowing thickness determination of freestanding thin plastic foils by its transmission characteristics in the extreme ultraviolet (EUV) spectrum. The is based on laser induced plasma source, emitting light EUV region, compact double-mirror monochromator operating at fixed wavelength 18.9 nm, CCD camera. measurement delivers values with standard deviation ΔT = 0.005 enabling characterization nm-accuracy given foil density stoichiometric composition....
The spatial distribution of protons accelerated from submicron-thick plastic foil targets using multi-terawatt, frequency-doubled laser pulses with ultra-high temporal contrast has been investigated experimentally. A very stable, ring-like beam profile the protons, oriented around target's normal direction observed. ring's opening angle found to decrease increasing thicknesses. Two-dimensional particle-in-cell simulations reproduce our results indicating that ring is formed during expansion...
Abstract We simulated a doublet of permanent magnet quadrupoles (PMQs) to estimate the sensitivity on positioning precision and its impact spectral properties transported protons. The study guided construction testing focusing setup for laser-accelerated proton bunches with energies between 6 10 MeV. Our results shed light possible applications that may arise from broad input particle spectra.
We introduce a target concept for laser-driven ion acceleration with ultrashort, highly intense laser pulses that includes an integrated double plasma mirror contrast enhancement. It comprises three nanometer thin plastic foils, embedded in small metal structure, which ensures precise mounting. The geometry allows to apply directly front of foil within the converging beam, enabling moderate-energy (∼1 J) systems reach required fluence several hundred J/cm2 on mirrors. During experimental...