Results 61 to 70 of about 27,457 (262)

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

A Practical Noise2Noise Denoising Pipeline for High‐Throughput Raman Spectroscopy

Advanced Engineering Materials, EarlyView.
A lightweight and reproducible denoising pipeline for high‐throughput Raman spectroscopy is introduced, based on a 1D convolutional autoencoder trained with a Noise2Noise strategy. Using only repeated short‐exposure acquisitions, the method suppresses stochastic noise without reference spectra, enabling reliable spectral reconstruction while preserving
David Martin‐Calle, Cesar Alvarez‐Llamas, Vincent Motto‐Ros, Christophe Dujardin, Jérémie Margueritat, David Rodney   +5 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

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

Influence of Scan Strategies in Electron Beam Powder Bed Fusion on Solidification, Microstructure, and High‐Temperature Compressive Properties of γ′‐Strengthened Inconel 738LC

Advanced Engineering Materials, EarlyView.
Experiments and thermophysical simulations were conducted to investigate the electron beam powder bed fusion electron beam (PBF‐EB/M) process for the γ′‐strengthened nickel‐based superalloy Inconel 738LC. The results demonstrate the impact of process‐induced microstructural variations on high‐temperature mechanical behavior, providing a basis for ...
Jan Niklas Petenati, Karthik Kumar Banku, Prasanth Bondi, Ivan Zhirnov, Yangyiwei Yang, Gordon Schmidt, Jürgen Christen, Georg Hasemann, Manja Krüger, Bai‐Xiang Xu, Bilal Gökce, Silja‐Katharina Rittinghaus   +11 more
wiley   +1 more source

External and Internal Cracking Caused by Heat Treatment in Laser Powder Bed Fusion‐Fabricated Inconel 738LC Components

Advanced Engineering Materials, EarlyView.
Manufacturing problems such as heat treatment‐induced cracking hinder the widespread application of the laser powder bed fusion (LPBF) process to superalloys. In this study, cracks in the LPBF components of Inconel 738LC superalloy are characterized after heat treatment at various temperature ranges, revealing two distinct cracking behaviors.
Kosuke Kuwabara, Masahiro Kusano, Ayako Ikeda, Toshio Osada, Makoto Watanabe   +4 more
wiley   +1 more source

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

On the Importance of Electron Beam Brightness in High Gain Free Electron Lasers

Photonics, 2015
Linear accelerators delivering high brightness electron beams are essential for driving short wavelength, high gain free-electron lasers (FELs). The FEL radiation output efficiency is often parametrized through the power gain length that relates FEL ...
Simone Di Mitri
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