Bolko Beutner
YOU?
Author Swipe
View article: Model-independent tuning for maximizing free electron laser pulse energy
Model-independent tuning for maximizing free electron laser pulse energy Open
The output power of a free electron laser (FEL) has extremely high variance even when all FEL parameter set points are held constant because of the stochastic nature of the self-amplified spontaneous emission (SASE) FEL process, drift of t…
View article: First Characterization of the Photon Beam at the European XFEL in July, 2017
First Characterization of the Photon Beam at the European XFEL in July, 2017 Open
North branch of the European XFEL, SASE1, produced first light on May 3rd, 2017, and XFEL operation has been gradually improved then. First characterization of the photon beam has been performed in July / August 2017, just before an offici…
View article: Multi-Beamline Operation at the European XFEL
Multi-Beamline Operation at the European XFEL Open
The European XFEL uses a unique beam distribution scheme to direct electron bunches to its three undulator lines. The accelerator delivers up to 600 microsecond long bunch trains, out of which parts or individual bunches can be selected fo…
View article: Numerical Studies on RF-Induced Trajectory Variations at the European XFEL
Numerical Studies on RF-Induced Trajectory Variations at the European XFEL Open
At the European X-Ray Free-Electron Laser, superconducting TESLA-type cavities are used for acceleration of the driving electron bunches. Due to the high achievable duty cycle, a long radio frequency (RF) pulse structure can be provided, w…
View article: Status of the Standard Electron Beam Diagnostics of the EU-XFEL
Status of the Standard Electron Beam Diagnostics of the EU-XFEL Open
Outline• Setup and status accelerator• Diagnostics• BPMs• Toroids• Beam Loss Monitors• Wirescanner• Dosimetry• Summary
View article: Fast Image Analysis for Beam Profile Measurement at the European XFEL
Fast Image Analysis for Beam Profile Measurement at the European XFEL Open
At the European XFEL, images of scintillator screens are processed at a rate of 10 Hz. Dedicated image analysis servers are used for transversal beam profile analysis as well as for longitudinal profile and slice emittance measurement. Thi…
View article: Online Longitudinal Bunch Profile and Slice Emittance Diagnostics at the European XFEL
Online Longitudinal Bunch Profile and Slice Emittance Diagnostics at the European XFEL Open
The longitudinal current profile and slice emittance are important bunch parameters for the operation of an X-ray free-electron laser. At the European XFEL, dedicated diagnostic sections equipped with transverse deflecting RF structures (T…
View article: Emittance Measurement and Optics Matching at the European XFEL
Emittance Measurement and Optics Matching at the European XFEL Open
Electron beam quality described by the emittance or phase space moments are important for the operation of FEL facilities like the European XFEL. For the operation these parameters need to be routinely measured. Based on such measurements …
View article: Energy Beam Position Monitor Button Array Electronics for the European XFEL
Energy Beam Position Monitor Button Array Electronics for the European XFEL Open
The European XFEL(X-Ray Free Electron Laser) at DESY(Deutsches Elektronen-Synchrotron) in Hamburg/Schenefeld started commissioning in early 2017. Before the pulsed electron beam is accelerated to its final energy of 14 GeV, the energy of t…
View article: High Level Software for the Commissioning of the European XFEL
High Level Software for the Commissioning of the European XFEL Open
The European X-Ray Free-Electron Laser (XFEL) will generate extremely short and intense X-ray flashes from the electron beam of a 2.1 km long superconducting linear accelerator. The commissioning and operation of the accelerator relies hea…
View article: Studies of the Transverse Beam Coupling in the European XFEL Injector
Studies of the Transverse Beam Coupling in the European XFEL Injector Open
Coupling between the transverse plains leads to an increase of the horizontal and vertical electron beam emittances. The coupling can be measured with dedicated multi quadrupole scans while the correlations of the beam are observed on a sc…
View article: First Experience with the Standard Diagnostics at the European XFEL Injector
First Experience with the Standard Diagnostics at the European XFEL Injector Open
The injector of the European XFEL is in operation since December 2015. It includes, beside the gun and the accelerating section, containing 1.3 and a 3.9 GHz accelerating module, a variety of standard diagnostics systems specially designed…
View article: X-Band TDS Project
X-Band TDS Project Open
Based on the success of the X-Band Transverse Deflecting Structure (TDS) diagnostic at LCLS*, a collaboration between DESY, PSI and CERN has formed with the aim of developing and building an advanced modular X-Band TDS system. The designed…
View article: Electron Beam Phase Space Tomography at the European XFEL Injector
Electron Beam Phase Space Tomography at the European XFEL Injector Open
The FEL process is determined by the 6D phase space distribution of relativistic electron bunches. Experimental reconstructions of these distributions are therefore a step foreward to understand the beam dynamics and to optimize FEL operat…
View article: First Beam Halo Measurements using Wire Scanners at the European XFEL
First Beam Halo Measurements using Wire Scanners at the European XFEL Open
Beam halo measurements and collimations are of great importance at the European XFEL, especially for the operation at high repetition rates (27000 pulses/s). First beam halo measurements have been performed during the commissioning using t…
View article: Generation of large-bandwidth x-ray free-electron-laser pulses
Generation of large-bandwidth x-ray free-electron-laser pulses Open
X-ray free-electron lasers (XFELs) are modern research tools in disciplines such as biology, material science, chemistry, and physics. Besides the standard operation that aims at minimizing the bandwidth of the produced XFEL radiation, the…
View article: Preservation of low slice emittance in bunch compressors
Preservation of low slice emittance in bunch compressors Open
Minimizing the dilution of the electron beam emittance is crucial for the performance of accelerators, in particular for free electron laser facilities, where the length of the machine and the efficiency of the lasing process depend on it.…
View article: High Level Software for the Commissioning of the European XFEL
High Level Software for the Commissioning of the European XFEL Open
The European X-Ray Free-Electron Laser (XFEL) will generate extremely short and intense X-ray flashes from the electron beam of a 2.1 km long superconducting linear accelerator. The commissioning and operation of the accelerator relies hea…
View article: Optimization of free electron laser performance by dispersion-based beam-tilt correction
Optimization of free electron laser performance by dispersion-based beam-tilt correction Open
Free electron lasers in the X-ray regime require a good slice alignment along the electron bunch to achieve their best performance. A transverse beam slice shift reduces this alignment and spoils projected emittance and optics. Coherent sy…
View article: High Level Controls for the European XFEL
High Level Controls for the European XFEL Open
The European X-Ray Free-Electron Laser (XFEL) will generate extremely short and intense X-ray flashes from the electron beam of a 2.1 km long superconducting linear accelerator. Due to the complexity of the facility and the sheer number of…
View article: Electron Beam Phase Space Tomographie at the European XFEL Injector
Electron Beam Phase Space Tomographie at the European XFEL Injector Open
Transverse emittances as well as the energy spread and the peak current of the electron bunches are important parameters for high-gain free electron lasers such as the European XFEL. Investigations of the 6D phase space characterisation wo…