A5043759645- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Laser-Matter Interactions and Applications
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- Gyrotron and Vacuum Electronics Research
- Terahertz technology and applications
- Particle accelerators and beam dynamics
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Magnetic confinement fusion research
- Photonic and Optical Devices
- Advanced Surface Polishing Techniques
- Pulsed Power Technology Applications
- Welding Techniques and Residual Stresses
- Advanced Chemical Physics Studies
- Physics of Superconductivity and Magnetism
- Advanced Electron Microscopy Techniques and Applications
- Additive Manufacturing Materials and Processes
- Magnetic properties of thin films
- Laser Material Processing Techniques
- Plasma Diagnostics and Applications
- Image Processing and 3D Reconstruction
- nanoparticles nucleation surface interactions
Deutsches Elektronen-Synchrotron DESY
2018-2025
Friedrich-Alexander-Universität Erlangen-Nürnberg
2024
Reutlingen University
2023
Center for Free-Electron Laser Science
2012-2021
Universität Hamburg
2012-2021
Babeș-Bolyai University
2020
Max Planck Institute of Quantum Optics
2011-2020
Ludwig-Maximilians-Universität München
2009-2020
German Center for Lung Research
2020
Hamburg Institut (Germany)
2015
Abstract Plasma-based accelerators use the strong electromagnetic fields that can be supported by plasmas to accelerate charged particles high energies. Accelerating field structures in plasma generated powerful laser pulses or particle beams. This research has recently transitioned from involving a few small-scale efforts development of national and international networks scientists substantial investment large-scale infrastructure. In this New Journal Physics 2020 Plasma Accelerator...
Abstract The kinetics of the reactions primary and secondary amines with benzhydrylium ions quinone methides in acetonitrile have been studied under pseudo‐first‐order conditions (high excess amines) by UV/Vis spectrophotometry. Generally, plots k obs versus amine concentration were linear, line a second‐order rate law. However, for some methides, showed an upward curvature, which indicates rate‐limiting deprotonation initially formed adduct second molecule amine. From constants 2 attack on...
Having a table-top x-ray free-electron-laser source at their disposal must be the dream of every scientist. A new design based on currently available laboratory-scale laser-plasma particle accelerators shows that this should within reach before too long.
Using quadrupole scan measurements we show laser-wakefield accelerated electrons to have a normalized transverse emittance of ${0.21}_{\ensuremath{-}0.02}^{+0.01}\ensuremath{\pi}\text{ }\mathrm{mm}\text{ }\mathrm{mrad}$ at 245 MeV. We demonstrate multishot and single-shot method, the mean values for both methods agree well. A simple model beam dynamics in plasma density downramp accelerator exit matches source size divergence inferred from measurement. In energy range 300 MeV remains constant.
Highly-efficient optical generation of narrowband terahertz radiation enables unexplored technologies and sciences from compact electron acceleration to charge manipulation in solids. State-of-the-art conversion efficiencies are currently achieved using difference-frequency driven by temporal beating chirped pulses but remain, however, far lower than desired or predicted. Here we show that high-order spectral phase fundamentally limits the efficiency chirped-pulse resolve this limitation...
Experiments trace variations in the energy of a laser-plasma electron beam to properties drive laser, establishing technique for stabilizing compact next-generation sources high-energy electrons.
Generating high-quality laser-plasma accelerated electron beams requires carefully balancing a plethora of physical effects and is therefore challenging---both conceptually in experiments. Here, we use Bayesian optimization key laser plasma parameters to flatten the longitudinal phase space an ionization-injected bunch via optimal beam loading. We first study concept with particle-in-cell simulations then demonstrate it Starting from arbitrary set point, accelerator autonomously tunes energy...
Applications of laser-plasma accelerators demand low energy spread beams and high-efficiency operation. Achieving both requires flattening the accelerating fields by controlled beam loading plasma wave. Here, we optimize generation an electron bunch via localized ionization injection, such that combination injected current profile averaged acceleration dynamics results in optimal conditions. This enables reproducible production 1.2% rms bunches with 282 MeV 44 pC at estimated energy-transfer...
We present a high-energy laser source consisting of an ultrafast thin-disk amplifier followed by nonlinear compression stage. At repetition rate 5 kHz, the drive provides pulse energy up to 200 mJ with duration below 500 fs. Nonlinear broadening is implemented inside Herriott-type multipass cell purged noble gas, allowing us operate under different seeding conditions. Firstly, 64 pulses demonstrated in argon-filled cell, showing compressibility down 32 Finally, we employ helium as medium...
Abstract Radio-frequency (RF) accelerators providing high-quality relativistic electron beams are an important resource enabling many areas of science, as well industrial and medical applications. Two decades ago, laser-plasma 1 that support orders magnitude higher electric fields than those provided by modern RF cavities produced quasi-monoenergetic for the first time 2–4 . Since then, high-brightness at gigaelectronvolt (GeV) beam energy competitive properties have been demonstrated from...
Two-color, single-shot time-of-flight electron spectroscopy of atomic neon was employed at the Linac Coherent Light Source (LCLS) to measure laser-assisted Auger decay in x-ray regime. This x-ray-optical cross-correlation technique provides a straightforward, non-invasive and on-line means determining duration femtosecond (>40 fs) pulses. In combination with theoretical model process based on soft-photon approximation, we were able obtain LCLS pulse extract mean value temporal jitter between...
Laser-plasma accelerators, providing high electric field gradients, are promising candidates to drive next-generation compact light sources and high-energy applications. However, conservation of beam emittance, a prerequisite for future applications, is very challenging, as the accelerated has be matched plasma's strong focusing forces. Here we derive with simulations ideal laser plasma density profiles match an electron in out stage, thus relaxing required beta functions injection...
We generate narrowband terahertz (THz) radiation in periodically poled lithium niobate (PPLN) crystals using two chirped-and-delayed driver pulses from a high-energy Ti:sapphire laser. The generated frequency is determined by the phase-matching condition PPLN and influences temporal delay of for efficient generation. achieve internal conversion efficiencies up to 0.13% as well record multicycle THz energy 40 μJ at 0.544 cryogenically cooled PPLN.
The Horizon 2020 Project EuPRAXIA ("European Plasma Research Accelerator with eXcellence In Applications") is preparing a conceptual design report of highly compact and cost-effective European facility multi-GeV electron beams using plasma as the acceleration medium. accelerator will be based on laser and/or beam driven approach used for photon science, high-energy physics (HEP) detector tests, other applications such X-ray sources medical imaging or material processing. started in November...
We have measured the melting temperature of nanoscale indium islands on a WSe(2) substrate using perturbed angular correlations combined with scanning tunneling microscopy. The are self-assembled nanostructures whose diameter can vary between about 5 and 100 nm, depending deposition conditions. point decreases due to surface energies as get smaller. This decrease depends faceting crystalline interactions substrate.
This Letter of Intent describes LUXE (Laser Und XFEL Experiment), an experiment that aims to use the high-quality and high-energy electron beam European a powerful laser. The scientific objective is study quantum electrodynamics processes in regime strong fields. High-energy electrons, accelerated by linear accelerator, photons, produced via Bremsstrahlung those colliding with laser shall experience electric field up three times larger than Schwinger critical (the at which vacuum itself...
Abstract Background Diagnostic classification of central vs. peripheral etiologies in acute vestibular disorders remains a challenge the emergency setting. Novel machine-learning methods may help to support diagnostic decisions. In current study, we tested performance standard and approaches consecutive patients with or disorders. Methods 40 Patients stroke (19 21 without syndrome (AVS), defined by presence spontaneous nystagmus) 68 AVS due neuritis were recruited department, context...
Two-color (x-ray+infrared) electron spectroscopy is used for investigating laser-assisted KLL Auger decay following 1s photoionization of atomic Ne with few-femtosecond x-ray pulses from the Linac Coherent Light Source. In an angle-resolved experiment, overall width laser-modified Auger-electron spectrum and its structure change significantly as a function emission angle. The spectra are characterized by strong intensity variation sidebands revealing gross structure. This caused, predicted...
High average power high-intensity laser systems can suffer from a heat-induced deformation of the final compressor gratings, which introduces wavefront aberrations and spatio-temporal couplings to pulse. Here, we use simple numerical description, that was first introduced by Li et al. (Appl. Phys. Express, 10, 102702, 2017 Optics 26, 8453, 2018), calculate resulting degradation peak intensity 3-dimensional pulse as function power, verify results using experimental data. For typical 100...
Particle in Cell (PIC) simulations are a widely used tool for the investigation of both laser- and beam-driven plasma acceleration. It is known issue that beam quality can be artificially degraded by numerical Cherenkov radiation (NCR) resulting primarily from an incorrectly modeled dispersion relation. Pseudo-spectral solvers featuring infinite order stencils strongly reduce NCR—or even suppress it—and therefore well suited to correctly model properties. For efficient parallelization PIC...
The LUX beamline is a novel type of laser-plasma accelerator. Building on the joint expertise University Hamburg and DESY was carefully designed to combine state-of-the-art in acceleration with latest advances accelerator technology beam diagnostics. introduces paradigm change moving from single-shot demonstration experiments towards available, stable controllable operation. Here, we discuss general design concepts present first critical milestones that have recently been achieved, including...