Results 61 to 70 of about 27,391 (261)

Method for polarization shaping at free-electron lasers

Physical Review Accelerators and Beams, 2019
X-ray free electron lasers provide short, polarized, high-power pulses of x-ray radiation, where polarization properties are determined by the undulator magnetic field.
Svitozar Serkez, Andrei Trebushinin, Mykola Veremchuk, Gianluca Geloni   +3 more
doaj   +1 more source

Delay-detune scan for longitudinal electron beam characterization at free-electron lasers

Physical Review Accelerators and Beams, 2020
We present first experimental results of a novel method to study the energy chirp of the electron beam lasing window at a free-electron laser operating in self-amplified spontaneous emission mode.
Svitozar Serkez, Gianluca Geloni, Marc Guetg, Vitali Kocharyan, Shan Liu, Evgeni Saldin   +5 more
doaj   +1 more source

Pump-Probe Time-Resolved Serial Femtosecond Crystallography at X-Ray Free Electron Lasers

Crystals, 2020
With time-resolved crystallography (TRX), it is possible to follow the reaction dynamics in biological macromolecules by investigating the structure of transient states along the reaction coordinate.
Suraj Pandey, Ishwor Poudyal, Tek Narsingh Malla   +2 more
doaj   +1 more source

Additive Manufacturing of Continuous Fibre Reinforced Composites: Process, Characterisation, Modelling, and Sustainability

Advanced Engineering Materials, EarlyView.
Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley   +1 more source

Novel Photocathode Lasers for the Hard- and Soft-X-ray Free Electron Lasers EuXFEL and FLASH [PDF]

EPJ Web of Conferences
We developed, constructed and commissioned novel photocathode lasers for the X-ray FELs European XFEL and FLASH which allow emittance optimization via beam shaping. Both facilities operate continuously with those lasers since Jan.
Mahnke Christoph, Li Chen, Ahmed Areeb, Akcaalan Oender, Brinker Frank, Chen Ye, Good James, Grosse-Wortmann Uwe, Guetg Marc, Ilia Denis, Kschuev Nick, Mohr Christian, Panuganti Harsha, Pressacco Federico, Schaper Lucas, Schulz Sebastian, Schreiber Siegfried, Tavakol Hamed, Tünnermann Henrik, Vidoli Caterina, Vogt Matthias, Winkelmann Lutz, Hartl Ingmar   +22 more
doaj   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

Fatigue Crack Initiation and Growth in Nanocrystalline Ni at Multiple Length‐Scales

Advanced Engineering Materials, EarlyView.
Overview of miniaturized in situ SEM fatigue setup and resultant fatigue crack growth data for nanocrystalline Ni. The presented study focuses on the analysis of fatigue crack growth rate (FCGR) in focused ion beam‐notched microcantilevers prepared from nanocrystalline (NC) Ni as a model material.
Igor Moravcik, Alexander Jelinek, Markus Alfreider, Jutta Luksch, Anton Hohenwarter, Florian Schaefer, Christian Motz, Daniel Kiener   +7 more
wiley   +1 more source

Powerful terahertz free electron lasers with hybrid Bragg reflectors

Physical Review Special Topics. Accelerators and Beams, 2011
For the electron devices with oversized interaction space, the Bragg structures of different types are effective instruments for controlling and redistribution of the electromagnetic energy fluxes to provide a spatial coherence of radiation.
N. S. Ginzburg, A. M. Malkin, N. Yu. Peskov, A. S. Sergeev, V. Yu. Zaslavsky, I. V. Zotova   +5 more
doaj   +1 more source

Analysis of ultra-short bunches in free-electron lasers

New Journal of Physics, 2020
Free-electron lasers (FELs) operate at wavelengths from millimeter waves through hard x-rays. At x-ray wavelengths, FELs typically rely on self-amplified spontaneous emission (SASE).
L T Campbell, H P Freund, J R Henderson, B W J McNeil, P Traczykowski, P J M van der Slot   +5 more
doaj   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source