A5046888071- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Crystallography and Radiation Phenomena
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Enzyme Structure and Function
- Laser-Plasma Interactions and Diagnostics
- Medical Imaging Techniques and Applications
- Adrenal and Paraganglionic Tumors
- Cardiac Imaging and Diagnostics
- Advanced X-ray and CT Imaging
- Laser-induced spectroscopy and plasma
- Advanced Data Storage Technologies
- Force Microscopy Techniques and Applications
- Atomic and Molecular Physics
- Gyrotron and Vacuum Electronics Research
- Advanced MRI Techniques and Applications
- Parallel Computing and Optimization Techniques
- Electron and X-Ray Spectroscopy Techniques
- Photonic and Optical Devices
- Scientific Computing and Data Management
European X-Ray Free-Electron Laser
2016-2025
Deutsches Elektronen-Synchrotron DESY
2012-2021
Universität Hamburg
2013
Lviv University
2012
The Linac Coherent Light Source has added a self-seeding capability to the soft x-ray range using grating monochromator system. We report demonstration of with measured resolving power 2000--5000, wavelength stability ${10}^{\ensuremath{-}4}$, and an increase in peak brightness by factor 2--5 across photon energy 500--1000 eV. By avoiding need for at experimental station, self-seeded beam can deliver as much 50-fold higher users.
Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range photon energies. Their revolutionary innovative developments have opened new fields science regarding nonlinear light-matter interaction, investigation ultrafast processes from specific observer sites, approaches to imaging matter atomic resolution. A core aspect FEL is study isolated prototypical systems...
Abstract High-resolution X-ray spectroscopy in the sub-nanosecond to femtosecond time range requires ultrashort pulses and a spectral flux considerably larger than that presently available. free-electron laser (XFEL) radiation from hard self-seeding (HXRSS) setups has been demonstrated past offers necessary peak properties. So far, these systems could not provide high repetition rates enabling average flux. We report results for cascaded HXRSS system installed at European XFEL, currently...
A hard X-ray Split-and-Delay Line (SDL) under construction for the Materials Imaging and Dynamics station at European X-Ray Free-Electron Laser (XFEL) is presented. This device aims providing pairs of pulses with a variable time delay ranging from −10 ps to 800 in photon energy range 5 10 keV correlation pump-probe experiments. custom designed mechanical motion system including active feedback control ensures that high demands stability accuracy can be met design goals achieved. Using...
X-ray pump/X-ray probe applications are made possible at Free Electron Laser (XFEL) facilities by generating two pulses with different wavelengths and controllable temporal delay. In order to enable this capability the European XFEL, an upgrade project equip soft SASE3 beamline a magnetic chicane is underway. present paper we describe status of project, its scientific focus expected performance, including start-to-end simulations photon beam transport up sample, as well recent experimental...
The successful operation of X-ray free-electron lasers (FELs), like the Linac Coherent Light Source or Free-Electron Laser in Hamburg (FLASH), makes unprecedented research on matter at atomic length and ultrafast time scales possible. However, order to take advantage these unique light sources meet strict requirements many experiments photon science, FEL pulse durations need be known tunable. This can achieved by controlling driving electron beams, high-resolution longitudinal beam...
Hard-x-ray self-seeded (HXRSS) free-electron lasers (FELs) can provide nearly fully coherent radiation pulses in the hard-x-ray domain with extremely high spectral density, which opens up new possibilities for a wide range of scientific applications such as resonant inelastic x-ray scattering, nuclear resonance and Raman spectroscopy. Spectral bandwidth signal-to-noise ratio (SNR) are two important parameters seeded FELs. Our theoretical experimental studies demonstrate that SNR HXRSS FELs...
The Single Particles, Clusters and Biomolecules & Serial Femtosecond Crystallography (SPB/SFX) instrument at the European XFEL is located behind SASE1 undulator aims to support imaging structure determination of biological specimen between about 0.1 μm 1 size. designed work photon energies from 3 keV up 16 keV. Here, we propose a cost-effective proof-of-principle experiment, aiming demonstrate actual feasibility single molecule diffraction experiment XFEL. To this end, assume...
Nonlinear x-ray spectroscopy The extension of nonlinear optics to the spectral domain is a promising direction in development spectroscopy. Although theoretical concepts were developed decades ago, scientists still struggle implement them because elusive nature effects. Eichmann et al. now present atomic momentum (AMS), which based on detection scattered atom after transfer from photons (see Perspective by Pfeifer). authors show how AMS can observe stimulated Raman scattering signals at neon...
Ultrafast X-ray spectroscopies require flexible properties together with high temporal and spectral resolution. Here, we demonstrate simultaneous sub-20 fs sub-eV resolutions for pump/probe experiments, without the need additional photon arrival-time monitors.
A hard x-ray self-seeding (HXRSS) setup will soon be available at the European X-ray Free Electron Laser (XFEL). The availability of high repetition rate pulses poses novel challenges in development, compared to choices made other facilities, mainly crystal heat-load and radiation-damage issues. However, high-repetition is expected allow for unprecedented output characteristics. two-chicane HXRSS found optimal XFEL. In this paper we discuss physical peculiar that facility simulations done,...
Inelastic X-ray scattering (IXS) is an important tool for studies of equilibrium dynamics in condensed matter. A new spectrometer recently proposed ultra-high-resolution IXS (UHRIX) has achieved 0.6 meV and 0.25 nm −1 spectral momentum-transfer resolutions, respectively. However, further improvements down to 0.1 0.02 are required close the gap energy–momentum space between high- low-frequency probes. It shown that this goal can be by optimizing optics increasing flux incident pulses. UHRIX...
Abstract High-intensity ultrashort X-ray free-electron laser (XFEL) pulses are revolutionizing the study of fundamental nonlinear x-ray matter interactions and coupled electronic nuclear dynamics. To fully exploit potential this powerful tool for advanced spectroscopies, a noninvasive spectral characterization incident stochastic XFEL with high resolution is key requirement. Here we present methodology that combines high-acceptance angle-resolved photoelectron time-of-flight spectroscopy...
Abstract We propose to develop, characterize and operate a superconducting undulator (SCU) afterburner consisting of 5 modules (1 module = 2 SCU coils m length 1 phase shifter) plus pre-series prototype at the SASE2 hard X-ray beamline European XFEL. This will produce an output in order 10 ph/pulse photon energies above 30 keV. The project is divided into production small-series modules. Central goals this R&D activity are: demonstration functionality SCUs FEL, set up needed...
Bragg diffraction from crystals is widely used to select a very narrow spectral range of x-ray pulses. The diffracted signal can be calibrate the photon energy, fact that exploited effectively at free-electron lasers (XFELs). This work describes three crystal-based methods this goal major FEL facility, European XFEL. These methods, which have wide applicability, been developed in relation hard self-seeding setup installed SASE2 undulator. They are fast and straightforward implement since...
Abstract Warm dense matter is at the boundary between a plasma and condensed phase plays role in astrophysics, planetary science inertial confinement fusion research. However, its electronic structure ionic upon irradiation with strong laser pulses remain poorly understood. Here, we use an intense ultrafast X-ray free-electron pulse to simultaneously create characterize warm copper using L -edge absorption spectroscopy over large intensity range. Below of 10 15 W cm −2 , peak below edge...
We study the dependence of peak power a 1.5 \AA{} Terawatt (TW), tapered x-ray free-electron laser (FEL) on transverse electron density distribution. Multidimensional optimization schemes for TW hard lasers are applied to cases transversely uniform and parabolic beam distributions compared Gaussian The optimizations performed 200 m undulator resonant wavelength ${\ensuremath{\lambda}}_{r}=1.5\text{ }\text{ }\AA{}$ using fully three-dimensional FEL particle code genesis. shows that flatter...
For more than a decade free-electron lasers (FELs) have been in operation, providing scientists from many disciplines with the benefits of ultrashort, nearly transversely coherent radiation pulses wavelengths down to \AA{}ngstrom range. If no further techniques are applied, FEL will only amplify stochastic distributed electron density bunch. Contemporary developments aim at producing stable and single-mode by preparing an bunch favorable longitudinal distributions using magnets conventional...
Abstract Understanding the interaction of intense, femtosecond X-ray pulses with heavy atoms is crucial for gaining insights into structure and dynamics matter. One key aspect nonlinear light–matter was, so far, not studied systematically at free-electron lasers—its dependence on photon energy. Here, we use resonant ion spectroscopy to map out transient electronic structures occurring during complex charge-up pathways xenon. Massively hollow featuring up six simultaneous core holes determine...
We report on observations of single spike spectra (3–13% events) upon employing a previously proposed method for generation via harmonic conversion. The was tested at the soft X-ray SASE3 undulator European XFEL. first part allows one to amplify bunching fundamental as well higher harmonics. downstream is tuned harmonic, fourth in our case, pulses with shorter duration. estimate generated pulse duration within such subset short level 650 as. Considering demonstrated probability events, this...
X-ray free-electron lasers (XFELs) provide extremely bright and highly spatially coherent x-ray radiation with femtosecond pulse duration. Currently, they are widely used in biology material science. Knowledge of the XFEL statistical properties during an experiment may be vitally important for accurate interpretation results. Here, first time, we demonstrate Hanbury Brown Twiss (HBT) interferometry performed diffraction mode at source. It allowed us to determine directly from Bragg peaks...
The generation of frequency-tunable, narrow-bandwidth and carrier-envelope-phase stable THz pulses with fields in the MV/cm regime that can be appropriately timed to femtosecond X-ray from free-electron-lasers is highest scientific interest. It will enable follow electronic structural dynamics stimulated by (non)linear selective excitations matter on few time Ångstrom length scales. In this article, a scheme based superradiant undulator emission generated just after XFEL proposed. concept...
Transmission measurements of the soft X-ray beamline to Small Quantum Systems (SQS) scientific instrument at SASE3 undulator European XFEL are presented. Measurements reported for a wide range photon energies (650 eV 2400 eV), using gas monitors as well bolometric radiometer. The results in good agreement with simulations beam transport and show transmission up 80% over whole energy range. contribution second- third-harmonic radiation is determined selected by performing absorber provide...
In this work, we propose to use a pinhole camera at high photon energies, specifically 200–300 keV, measure ultra-small electron beam size by means of bending magnet radiation. We show that there is sufficient flux the detector position. Our theoretical analysis includes an examination applicability van Cittert-Zernike theorem for radiation generated ultralow emittance and detailed imaging properties rectangular cameras. This led us practical, universal formulas. identify optimal aperture...