Thomas Schietinger
A5045515895- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Advanced Electron Microscopy Techniques and Applications
- Atomic and Subatomic Physics Research
- Crystallography and Radiation Phenomena
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Advancements in Photolithography Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Photonic and Optical Devices
- Radiation Therapy and Dosimetry
- Neutrino Physics Research
- Big Data Technologies and Applications
- Muon and positron interactions and applications
Paul Scherrer Institute
2015-2025
University of Zurich
2006
Boston University
1997
European Organization for Nuclear Research
1996
The SwissFEL X-ray Free Electron Laser (XFEL) facility started construction at the Paul Scherrer Institute (Villigen, Switzerland) in 2013 and will be ready to accept its first users 2018 on Aramis hard branch. In following sections we summarize various aspects of project, including design soft branches accelerator, results performance simulations, details photon beamlines experimental stations, our commissioning results.
The SwissFEL soft X-ray free-electron laser (FEL) beamline Athos will be ready for user operation in 2021. Its design includes a novel layout of alternating magnetic chicanes and short undulator segments. Together with the APPLE X architecture undulators, branch can operated different modes producing FEL beams unique characteristics ranging from attosecond pulse length to high-power modes. Further space has been reserved upgrades including modulators an external seeding better timing...
X-ray free-electron lasers (FELs) are state-of-the-art scientific tools capable to study matter on the scale of atomic processes. Since initial operation FELs more than a decade ago, several facilities with upgraded performance have been put in operation. Here we present first lasing results Athos, soft FEL beamline SwissFEL at Paul Scherrer Institute Switzerland. Athos features an undulator layout based short APPLE-X modules providing full polarisation control, interleaved small magnetic...
The SwissFEL Injector Test Facility operated at the Paul Scherrer Institute between 2010 and 2014, serving as a pilot plant testbed for development realization of SwissFEL, X-ray Free-Electron Laser facility under construction same institute. test consisted laser-driven rf electron gun followed by an S-band booster linac, magnetic bunch compression chicane diagnostic section including transverse deflecting cavity. It delivered bunches up to 200 pC charge 250 MeV beam energy repetition rate...
X-ray free-electron lasers (FELs) are cutting-edge research instruments employed in multiple scientific fields capable of analyzing matter with unprecedented time and spatial resolutions. Time-resolved measurements electron photon beams essential FELs. Radiofrequency (RF) transverse deflecting structures (TDSs) a fixed streaking direction standard diagnostics to measure the temporal properties beams. If placed after undulator FEL facility, TDSs can also be reconstruct power profile pulses....
A detailed analysis of measurement methods and optimization procedures for accurate the transverse slice projected emittances an electron beam in a linear accelerator have yielded errors 5%. After full optimization, about 200 nm pC 100 10 been demonstrated at SwissFEL Injector Test Facility.
This work describes a method for the generation of one and two-color ultra-short X-ray free-electron-laser pulses, based on tailoring Coulomb interaction between electrons highly compressed beam in nonlinear regime.
Radio-frequency (rf) photoinjectors are commonly used to generate intense bright electron beams for a wide range of applications, most notably as drivers X-ray Free-Electron Lasers. The photocathode, mounted inside an rf gun and illuminated by suitable laser, thereby plays crucial role the source electrons. intrinsic emittance quantum efficiency determined properties photocathode's surface material. We present measurements performed with copper cesium telluride cathodes in same...
We demonstrate the generation of widely tunable two-color x-ray free-electron laser (FEL) pulses at SwissFEL. In a split-undulator configuration, each color is produced in different undulator section, and chicane between two sections allows for variable time separation up to 500 fs. show an unprecedented photon energy ratio colors about three (350 915 eV), with individual pulse having peak power few gigawatts duration down femtosecond level. Moreover, we reduction required length via optical...
The transverse emittance of the electron beam is a fundamental parameter in linac-based x-ray free-electron lasers (FELs). We present results measurements carried out at SwissFEL, compact FEL facility Paul Scherrer Institute Switzerland, including description novel high-resolution measurement techniques and optimization procedure. obtained slice values undulator entrance down to 200 nm for an with charge pC rms duration 30--40 fs. Furthermore, we achieved emittances as low 100 10 beams few...
The intrinsic energy spread of electron beams needs to be measured characterize and optimize high-brightness beam sources such as those driving x-ray free-electron lasers (FELs). We demonstrate the use optical klystron effect a precise high-resolution method measure spread. setup consists undulator modules magnetic chicanes placed between them. is found by measuring radiation power produced in undulators function chicanes’ strengths. High resolution simplicity are advantages this approach,...
With the improvement of acceleration techniques, intrinsic emittance cathode has a strong impact on final brightness free electron laser. The systematic studies presented in this paper demonstrate for first time radiofrequency photocathode gun reduction when tuning laser photon energies close to effective work function copper. was determined by measuring core slice as beam size at wavelengths between 260 and 275 nm. results are consistent with measured cathode. Slice values normalized...
An optimization of the undulator layout X-ray free-electron-laser (FEL) facilities based on placing small chicanes between modules is presented. The installation magnetic offers following benefits with respect to state-of-the-art FEL facilities: reduction required length achieve saturation, improvement longitudinal coherence pulses, and ability produce shorter pulses higher power levels. Numerical simulations performed for soft beamline SwissFEL facility show that optimizing advantages...
X-ray free-electron lasers (XFELs), with pulse durations of a few tens femtoseconds or shorter, are cutting-edge instruments capable observing structure and dynamics at the atomic scale. Temporal diagnostics challenging but fundamental importance for XFEL performance experiments. In this paper, we demonstrate method to characterize on single-shot basis temporal profile both electron beam radiation femtosecond resolution. The approach consists in streaking after undulator using wakefields...
We demonstrate the generation of coherent soft x-ray free-electron laser (FEL) pulses with a duration below 1 fs using nonlinear compression low-charge electron beam (10 pC). The approach is simple, and it does not require any special hardware, so can be readily implemented at FEL facility. present temporal spectral diagnostics confirming production single-spike sub-femtosecond for photon energies 642 1111 eV. Our work will important ultrafast applications requiring x-rays.
SwissFEL has a unique capability, among the normal conducting linac-based light sources, to simultaneously serve two separate undulator lines (Aramis and Athos) up machine repetition rate of 100 Hz using double bunch operation mode. It increases twice experiments throughput facility with modest additional investment. Two electron bunches spaced 28 ns apart are extracted from cathode by laser pulses individually controlled rates. The accelerated about 3 GeV in main linac same rf macropulse....
Significant problems facing all experimental and computational sciences arise from growing data size complexity. Common to these is the need perform efficient I/O on diverse computer architectures. In our scientific application, largest parallel particle simulations generate vast quantities of six-dimensional data. Such a simulation run produces for an aggregate up several TB per run. Motived by address access challenges, we have implemented H5Part, open source API that simplifies use...
Minimizing the dilution of electron beam emittance is crucial for performance accelerators, in particular free laser facilities, where length machine and efficiency lasing process depend on it. Measurements performed at SwissFEL Injector Test Facility revealed an increase slice after compressing bunch even moderate compression factors. The phenomenon was experimentally studied by characterizing dependence effect parameters relevant compression. reproduction these measurements simulation...
We present high-resolution measurements of the electron beam energy spread at SwissFEL injector as a function bunch charge, optics, and longitudinal dispersion lattice. The measured values are in general an order magnitude higher than what is predicted by standard simulation codes. dependences indicate that blowup caused primarily intrabeam scattering microbunching instabilities, effects not covered conventional modeling radio-frequency injectors. further numerical model qualitatively...
Experimental and simulation results of an electron gun test facility, based on pulsed diode acceleration followed by a two-cell rf cavity at 1.5 GHz, are presented here. The main features this diode-rf combination are: high peak gradient in the (up to $100\text{ }\text{ }\mathrm{MV}/\mathrm{m}$) obtained without breakdown conditioning, cathode shape providing electrostatic focusing, in-vacuum solenoid focus beam between cavity. Although stand was initially developed for testing field emitter...
Abstract At the Paul Scherrer Institute, two electron accelerator-based photon sources are in operation, namely a synchrotron source, swiss light source (SLS), and an X-ray free-electron laser, SwissFEL. SLS has been operational since 2001 SwissFEL 2017. In this time, unique world-leading scientific programs methods have developed from fields as diverse macromolecular biology, chemical physical sciences, imaging, electronic structure behaviour of novel complex materials. To continue success,...