Results 61 to 70 of about 140,342 (289)

Model-based optimization of tapered free-electron lasers

Physical Review Special Topics. Accelerators and Beams, 2015
The energy extraction efficiency is a figure of merit for a free-electron laser (FEL). It can be enhanced by the technique of undulator tapering, which enables the sustained growth of radiation power beyond the initial saturation point.
Alan Mak, Francesca Curbis, Sverker Werin   +2 more
doaj   +1 more source

A Workflow to Accelerate Microstructure‐Sensitive Fatigue Life Predictions

Advanced Engineering Materials, EarlyView.
This study introduces a workflow to accelerate predictions of microstructure‐sensitive fatigue life. Results from frameworks with varying levels of simplification are benchmarked against published reference results. The analysis reveals a trade‐off between accuracy and model complexity, offering researchers a practical guide for selecting the optimal ...
Luca Loiodice, Krzysztof S. Stopka, Michael D. Sangid   +2 more
wiley   +1 more source

Active FEL-Klystrons as Formers of Femto-Second Clusters of Electromagnetic Field. Description of Models on the Basis of Sections of ‘Ordinary’ FEL’: Analisys [PDF]

Журнал нано- та електронної фізики, 2011
Physical processes of ultrashort electromagnetic cluster formation in multiharmonic parametrical free electron lasers are analyzed. The conditions, which are necessary for formation of such clusters, are found out.
V.V. Kulish, A.V. Lysenko, A.Ju. Brusnik
doaj  

Atomic inner-shell radiation seeded free-electron lasers

Physical Review Accelerators and Beams, 2018
In order to effectively improve the output quality of x-ray free electron laser (XFEL), we theoretically propose an XFEL scheme seeded by atomic inner-shell laser.
Han Zhang, Kai Li, Jiawei Yan, Haixiao Deng, Baoyuan Sun   +4 more
doaj   +1 more source

Influence of Sample Preparation and Processing Procedures on the Thermal Diffusivity of MgO‐C Refractories

Advanced Engineering Materials, EarlyView.
The thermal diffusivity of MgO‐C refractories is highly sensitive to sample preparation and processing procedures. In this article, the effects of coking sequence, machining conditions, structural inhomogeneity, and graphite coating application on measurements using laser flash apparatus are systematically investigated.
Luyao Pan, Rhena Wulf, Till M. J. Stadtmüller, Christos G. Aneziris, Tobias M. Fieback   +4 more
wiley   +1 more source

Linear optics correction for linacs and free electron lasers

Physical Review Accelerators and Beams, 2018
Linear optics errors in the linac, the transport line, and the undulator section of a free electron laser (FEL) can significantly impact the FEL performance.
Tong Zhang, Xiaobiao Huang, Tim Maxwell
doaj   +1 more source

Tunable Electron Multibunch Production in Plasma Wakefield Accelerators [PDF]

, 2014
Synchronized, independently tunable and focused $\mu$J-class laser pulses are used to release multiple electron populations via photo-ionization inside an electron-beam driven plasma wave.
Andonian, G., Aniculaesei, C., Bruhwiler, D. L., Campbell, L. T., Cormier, E., Deng, A., Ersfeld, B., Hidding, B., Hogan, M. J., Islam, M. R., Jaroszynski, D., Karger, O., McNeil, B. W. J., Murokh, A., Rosenzweig, J. B., Sheng, Z. -M., Wittig, G., Xi, Y.   +17 more
core   +1 more source

Investigation of Laser Ablation and Brush Pre‐Treatments for AlCu Cold Roll Bonding in Oxygen‐Free Conditions

Advanced Engineering Materials, EarlyView.
It is shown that laser ablation pretreatment under oxygen‐free conditions enables copper–aluminium bonding at significantly lower deformation degrees and improved properties compared to mechanical brushing. Laser ablation further increases interface contact area and induces favourable residual stress states and microstructural compatibility ...
Khemais Barienti, Finn‐Lennard Janthur, Selina Raumel, Sascha Jan Zimmermann, Sarah Seffer, René Gustus, Sebastian Herbst, Marc C. Wurz, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Florian Nürnberger   +11 more
wiley   +1 more source

Quantum regime of free electron lasers starting from noise

Physical Review Special Topics. Accelerators and Beams, 2006
We investigate the quantum regime of a high-gain free-electron laser starting from noise. In the first part, we neglect the radiation propagation and we formulate a quantum linear theory of the N-particle free-electron laser Hamiltonian model, quantizing
R. Bonifacio, N. Piovella, G. R. M. Robb, A. Schiavi   +3 more
doaj   +1 more source

Minimum Spectral Bandwidth in Echo Seeded Free Electron Lasers

Frontiers in Physics, 2019
This paper examines the impact of non-linear longitudinal phase distortions on the spectral bandwidth in echo seeded free electron lasers (FELs). It extends the existing theory developed in Hemsing [1] for echo-enabled harmonic generation (EEHG) to ...
Erik Hemsing
doaj   +1 more source