Results 61 to 70 of about 18,392 (242)

Maximizing Spectral Flux from Self-Seeding Hard X-ray FELs

, 2013
Fully coherent x-rays can be generated by self-seeding x-ray free-electron lasers (XFELs). Self-seeding by a forward Bragg diffraction (FBD) monochromator has been recently proposed [1] and demonstrated [2].
Shvyd'ko, Yuri, Yang, Xi
core   +2 more sources

Polarization operator approach to electron-positron pair production in combined laser and Coulomb fields [PDF]

, 2006
The optical theorem is applied to the process of electron-positron pair creation in the superposition of a nuclear Coulomb and a strong laser field. We derive new representations for the total production rate as two-fold integrals, both for circular ...
Hatsagortsyan, K. Z., Jentschura, U. D., Keitel, C. H., Milstein, A. I., Müller, C.   +4 more
core   +3 more sources

Spectrometer for Hard X-Ray Free Electron Laser Based on Diffraction Focusing

, 2012
X-ray free electron lasers (XFELs) generate sequences of ultra-short, spatially coherent pulses of x-ray radiation. We propose the diffraction focusing spectrometer (DFS), which is able to measure the whole energy spectrum of the radiation of a single ...
Gorobtsov, O. Y., Kohn, V. G., Vartanyants, I. A.   +2 more
core   +1 more source

High-resolution electron time-of-flight spectrometers for angle-resolved measurements at the SQS Instrument at the European XFEL

Journal of Synchrotron Radiation, 2022
A set of electron time-of-flight spectrometers for high-resolution angle-resolved spectroscopy was developed for the Small Quantum Systems (SQS) instrument at the SASE3 soft X-ray branch of the European XFEL.
Alberto De Fanis, Markus Ilchen, Alexander Achner, Thomas M. Baumann, Rebecca Boll, Jens Buck, Cyril Danilevsky, Sergey Esenov, Benjamin Erk, Patrik Grychtol, Gregor Hartmann, Jia Liu, Tommaso Mazza, Jacobo Montaño, Valerija Music, Yevheniy Ovcharenko, Nils Rennhack, Daniel Rivas, Daniel Rolles, Philipp Schmidt, Hamed Sotoudi Namin, Frank Scholz, Jens Viefhaus, Peter Walter, Pawel Ziółkowski, Haiou Zhang, Michael Meyer   +26 more
doaj   +1 more source

Superradiant Undulator Radiation for Selective THz Control Experiments at XFELs

, 2019
The generation of frequency-tunable, narrow-bandwidth and carrier-envelope-phase stable THz pulses with fields in the MV/cm regime that can be appropriately timed to the femtosecond X-ray pulses from free-electron-lasers is of highest scientific interest.
Asgekar, Vivek, Casalbuoni, Sara, Geloni, Gianluca, Gensch, Michael, Karabekyan, Suren, Kovalev, Sergey, Serkez, Svitozar, Tanikawa, Takanori   +7 more
core   +1 more source

Generation of time-synchronized two-color X-ray free-electron laser pulses using phase shifters

Scientific Reports, 2023
To optimize the intensity of X-ray free-electron lasers (XFELs), phase shifters, oriented in phase with the phases of the XFEL pulse and electron beam, are typically installed at undulator lines.
Myung-Hoon Cho, Teyoun Kang, Haeryong Yang, Gyujin Kim, Seong-Hoon Kwon, Kook-Jin Moon, Inhyuk Nam, Chang-Ki Min, Hoon Heo, Changbum Kim, Heung-Sik Kang, Chi Hyun Shim   +11 more
doaj   +1 more source

Decoding THz‐Driven Dynamic Fingerprints of Ferroelectric Nanotwin Networks

Advanced Materials, EarlyView.
ABSTRACT Ultrafast polarization dynamics in ferroelectrics are of considerable interest for high‐speed tunable dielectrics and electro‐optics. Extended domain wall networks formed in ferroelectric twin nanodomains can support collective dynamics in the terahertz regime but require techniques that track polarization and strain evolution driven by ...
Xiaojiang Li, Aiden Ross, Vladimir A. Stoica, Sujit Das, Sankalpa Hazra, Huaiyu (Hugo) Wang, Hari Padma, Matthias C. Hoffmann, Patrick Kramer, Sanghoon Song, Silke Nelson, Takahiro Sato, Diling Zhu, Ramamoorthy Ramesh, Lane W. Martin, Yue Cao, John W. Freeland, Aaron M. Lindenberg, Haidan Wen, Long‐Qing Chen, Venkatraman Gopalan   +20 more
wiley   +1 more source

Pair production by Schwinger and Breit-Wheeler processes in bi-frequent fields [PDF]

, 2016
Counter-propagating and suitably polarized light (laser) beams can provide conditions for pair production. Here, we consider in more detail the following two situations: (i) In the homogeneity regions of anti-nodes of linearly polarized ultra-high ...
Blaschke, D., Kämpfer, B., Nousch, T., Otto, A., Panferov, A. D., Seipt, D., Smolyansky, S. A., Titov, A. I.   +7 more
core   +1 more source

Experimental Demonstration of Attoseconds-at-Harmonics at the SASE3 Undulator of the European XFEL

Photonics, 2023
We report on observations of single spike spectra (3–13% of events) upon employing a previously proposed method for single spike generation via harmonic conversion. The method was tested at the soft X-ray SASE3 undulator of the European XFEL.
Andrei Trebushinin, Gianluca Geloni, Svitozar Serkez, Giuseppe Mercurio, Natalia Gerasimova, Theophilos Maltezopoulos, Marc Guetg, Evgeny Schneidmiller   +7 more
doaj   +1 more source

Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet

, 2017
A nonlinear interaction between photons is observed in a process that involves charge sources. To observe this process in a vacuum, there are a growing number of theoretical and experimental studies.
Asai, S., Fan, X., Inada, T., Kamioka, S., Namba, T., Seino, Y., Yamaji, T., Yamazaki, T.   +7 more
core   +1 more source