Article
Multidisciplinary Sciences
A. Hanuka, C. Emma, T. Maxwell, A. S. Fisher, B. Jacobson, M. J. Hogan, Z. Huang
Summary: In this study, a machine learning-based Virtual Diagnostic tool is introduced to accurately predict the longitudinal phase space of an electron beam using spectral information, offering improvements in experimental setups and reducing data storage and processing burden.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Evgeny Schneidmiller, Ivette J. Bermudez Macias, Martin Beye, Markus Braune, Marie Kristin Czwalinna, Stefan Duesterer, Bart Faatz, Rosen Ivanov, Ulf Fini Jastrow, Marion Kuhlmann, Juliane Roensch-Schulenburg, Siegfried Schreiber, Andrey Sorokin, Kai Tiedtke, Mikhail Yurkov, Johann Zemella
Summary: FLASH is the first soft X-ray FEL user facility, providing photon beams since 2005. The gap-tunable FLASH2 undulator branch allows for testing advanced lasing concepts. A two-color operation mode based on alternatingly tuned undulator segments has advantages over generating two colors in consecutive sections. This study developed methods for simultaneous intensity measurements and demonstrated measurement capabilities of spectral and temporal properties of two pulses.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Adeline Kabacinski, Eduardo Oliva, Fabien Tissandier, Julien Gautier, Michaela Kozlova, Jean-Philippe Goddet, Igor A. Andriyash, Cedric Thaury, Philippe Zeitoun, Stephane Sebban
Summary: Controlling the group velocity of an ultrashort laser pulse using spatio-temporal couplings improves the performance of a seeded soft X-ray laser (SXRL). The energy extraction increases threefold when the pump group velocity varies. By compensating the natural group velocity mismatch, the SXRL pulse duration can be kept constant, resulting in energetic pulses as short as 350 fs. This achievement demonstrates the 'flying focus effect' in controlling the group velocity of a high-intensity laser pulse in a plasma.
Article
Astronomy & Astrophysics
Sheridan J. Lloyd, Paula M. Chadwick, Anthony M. Brown, Huai-Ke Guo, Kuver Sinha
Summary: The study focuses on the emission of axion-like particles (ALPs) from the core of a magnetar, converting to photons in its magnetosphere. The resulting photon flux is influenced by the product of ALP-nucleon and ALP-photon couplings, with limits set using observational data, and a detailed analysis of the dependence on core temperature. Projections for future observations with Fermi-GBM are also provided.
Article
Multidisciplinary Sciences
C. G. L. Bottcher, S. P. Harvey, S. Fallahi, G. C. Gardner, M. J. Manfra, U. Vool, S. D. Bartlett, A. Yacoby
Summary: This study demonstrates a controllable spin-photon coupling based on a longitudinal interaction, enabling remote entangling operations in a quantum computer. By driving a singlet-triplet qubit near the resonator frequency, a longitudinal coupling with a high-impedance superconducting resonator is achieved. The energy splitting of the qubit is measured as a function of the drive amplitude and frequency, showing pronounced effects near the resonator frequency due to longitudinal coupling.
NATURE COMMUNICATIONS
(2022)
Article
Biophysics
Shu Gong, Lim Wei Yap, Yuxin Zhang, Jinyuan He, Jialiang Yin, Faezeh Marzbanrad, David M. Kaye, Wenlong Cheng
Summary: This study reports a lightweight and user-friendly non-invasive wearable cardiac sensing system based on deformation-insensitive conductive gold nanowire foam and pressure-sensitive resistive gold nanowire electronic skin. The system enables real-time recording of electrocardiogram and artery pulses under dynamic real-world settings, and can also estimate blood pressure using machine learning algorithms.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Physics, Applied
Masato Ota, Koichi Kan, Soichiro Komada, Yasunobu Arikawa, Tomoki Shimizu, Valynn Katrine Mag-usara, Youichi Sakawa, Tatsunosuke Matsui, Makoto Nakajima
Summary: In this study, electro-optic (EO) sampling was used to measure the electric field profiles generated by a relativistic electron bunch in both longitudinal and transverse directions. By adjusting the time delay and shifting the electron bunch path, the longitudinal and transverse profiles were successfully obtained, showing good agreement with particle-in-cell calculations. This promising method allows for the simultaneous measurement of longitudinal and transverse beam sizes using the detected spatio-temporal electric field distribution.
APPLIED PHYSICS EXPRESS
(2021)
Article
Nanoscience & Nanotechnology
Lei Zheng, Urs Zywietz, Tobias Birr, Martin Duderstadt, Ludger Overmeyer, Bernhard Roth, Carsten Reinhardt
Summary: The study demonstrates a simple and low-cost method for rapid generation of high-resolution and accurate optical micro- and nanostructures using UV-LED projection photolithography. The developed system allows for the preparation of photonic devices with various geometrical complexities and dimensions from nanometers to centimeters.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Physical
Julian Holland, Rudolf Weber, Marc Sailer, Thomas Graf
Summary: This study investigates and simulates soft X-ray emissions during the processing of industrial materials with ultrafast lasers. Experimental data verifies a model that extends an existing analytical model to consider the influence of laser pulse duration on the fraction of hot electrons in the generated plasma.
Article
Optics
Yan Song, Bodong Peng, Qing Xu, Guzhou Song, Zhiqin Yue, Baojun Duan, Changcai Han, Weipeng Yan, Zhiming Yao, Jiming Ma, Liang Sheng, Binkang Li
Summary: A method for analyzing the spatio-temporal intensity distribution of pulse beams using an all-optical image sensor has been developed. The study successfully simulated the interaction between an electron beam and the image sensor, demonstrating its capability for analyzing the spatio-temporal distribution of fast pulse laser beams.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Physics, Multidisciplinary
Archana Sampath, Xavier Davoine, Sebastien Corde, Laurent Gremillet, Max Gilljohann, Maitreyi Sangal, Christoph H. Keitel, Robert Ariniello, John Cary, Henrik Ekerfelt, Claudio Emma, Frederico Fiuza, Hiroki Fujii, Mark Hogan, Chan Joshi, Alexander Knetsch, Olena Kononenko, Valentina Lee, Mike Litos, Kenneth Marsh, Zan Nie, Brendan O'Shea, J. Ryan Peterson, Pablo San Miguel Claveria, Doug Storey, Yipeng Wu, Xinlu Xu, Chaojie Zhang, Matteo Tamburini
Summary: Researchers have demonstrated a new high-energy photon source by using a high-current ultrarelativistic electron beam interacting with multiple submicrometer-thick conducting foils, which can achieve strong self-focusing and efficient emission of gamma-ray synchrotron photons. This approach can obtain femtosecond collimated electron and photon beams with simplicity, unique properties, and high efficiency.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
N. G. Burdet, V Esposito, M. H. Seaberg, C. H. Yoon, J. J. Turner
Summary: X-ray photon fluctuation spectroscopy using a two-pulse mode at the Linac Coherent Light Source shows potential for studying quantum fluctuations in materials but faces challenges in data analysis complexity. Modifying numerical modeling tools can optimize parameters for extracting speckle contrast, allowing for measurement of correlation time for spontaneous fluctuations.
SCIENTIFIC REPORTS
(2021)
Article
Automation & Control Systems
Javier Leon, Juan Jose Escobar, Marina Bravo, Bruno Zamorano, Alberto Guillen
Summary: This paper addresses the importance of machine learning in solving classification problems in the field of Particle Physics and proposes several dataset representations and nine supervised learning algorithms for evaluation. Random Forest and XGBoost achieve the best results with roughly 88% test-set accuracy, demonstrating the potential of machine learning in solving significant research questions in Particle Physics.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Physics, Fluids & Plasmas
Nikolai Yampolsky, Kip Bishofberger
Summary: A universal framework has been developed to quickly solve a wide range of problems related to longitudinal space charge effects in beams and plasmas in cylindrical geometry. By introducing the longitudinal dielectric permittivity, the collective space charge response of the charged particle beam is described, resulting in an effective plasma frequency that depends on the transverse geometry of the system. This approach allows for the study of stability criteria for collective beam-beam and beam-plasma instabilities for arbitrary transverse distributions in particle densities, with the possibility of including multiple particle species as additive terms.
PHYSICS OF PLASMAS
(2021)
Article
Multidisciplinary Sciences
Kyo-Tae Kim, Yona Choi, Gyu-Seok Cho, Won-Il Jang, Kwang-Mo Yang, Soon-Sung Lee, Jungbae Bahng
Summary: This study verified some confusing points about electron film dosimetry using white polystyrene suggested by international protocols. The results showed that white polystyrene has similar water-equivalent characteristics as presented in the international protocols.
Article
Physics, Multidisciplinary
D. Ratner, R. Abela, J. Amann, C. Behrens, D. Bohler, G. Bouchard, C. Bostedt, M. Boyes, K. Chow, D. Cocco, F. J. Decker, Y. Ding, C. Eckman, P. Emma, D. Fairley, Y. Feng, C. Field, U. Flechsig, G. Gassner, J. Hastings, P. Heimann, Z. Huang, N. Kelez, J. Krzywinski, H. Loos, A. Lutman, A. Marinelli, G. Marcus, T. Maxwell, P. Montanez, S. Moeller, D. Morton, H. D. Nuhn, N. Rodes, W. Schlotter, S. Serkez, T. Stevens, J. Turner, D. Walz, J. Welch, J. Wu
PHYSICAL REVIEW LETTERS
(2015)
Article
Physics, Nuclear
Svitozar Serkez, Jacek Krzywinski, Yuantao Ding, Zhirong Huang
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
(2015)
Article
Chemistry, Physical
Kartik Ayyer, Gianluca Geloni, Vitali Kocharyan, Evgeni Saldin, Svitozar Serkez, Oleksandr Yefanov, Igor Zagorodnov
STRUCTURAL DYNAMICS-US
(2015)
Article
Instruments & Instrumentation
Oleg Chubar, Gianluca Geloni, Vitali Kocharyan, Anders Madsen, Evgeni Saldin, Svitozar Serkez, Yuri Shvyd'ko, John Sutter
JOURNAL OF SYNCHROTRON RADIATION
(2016)
Article
Instruments & Instrumentation
W. Lu, B. Friedrich, T. Noll, K. Zhou, J. Hallmann, G. Ansaldi, T. Roth, S. Serkez, G. Geloni, A. Madsen, S. Eisebitt
REVIEW OF SCIENTIFIC INSTRUMENTS
(2018)
Review
Optics
S. Serkez, G. Geloni, S. Tomin, G. Feng, E. V. Gryzlova, A. N. Grum-Grzhimailo, M. Meyer
Article
Physics, Nuclear
C. Emma, J. Wu, K. Fang, S. Chen, S. Serkez, C. Pellegrini
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
(2014)
Article
Physics, Nuclear
Svitozar Serkez, Andrei Trebushinin, Mykola Veremchuk, Gianluca Geloni
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2019)
Article
Chemistry, Multidisciplinary
Svitozar Serkez, Winfried Decking, Lars Froehlich, Natalia Gerasimova, Jan Gruenert, Marc Guetg, Marko Huttula, Suren Karabekyan, Andreas Koch, Vitali Kocharyan, Yauhen Kot, Edwin Kukk, Joakim Laksman, Pavel Lytaev, Theophilos Maltezopoulos, Tommaso Mazza, Michael Meyer, Evgeni Saldin, Evgeny Schneidmiller, Matthias Scholz, Sergey Tomin, Maurizio Vannoni, Torsten Wohlenberg, Mikhail Yurkov, Igor Zagorodnov, Gianluca Geloni
APPLIED SCIENCES-BASEL
(2020)
Article
Instruments & Instrumentation
Svitozar Serkez, Oleg Gorobtsov, Daniel E. Rivas, Michael Meyer, Bohdana Sobko, Natalia Gerasimova, Naresh Kujala, Gianluca Geloni
Summary: This paper proposes a simple and cost-effective method to extract information on the longitudinal Wigner distribution function of emitted FEL pulses, which is rather effective for fast feedback on the spectral and temporal properties of the radiation beam.
JOURNAL OF SYNCHROTRON RADIATION
(2021)
Article
Physics, Nuclear
Svitozar Serkez, Gianluca Geloni, Marc Guetg, Vitali Kocharyan, Shan Liu, Evgeni Saldin
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2020)
Article
Instruments & Instrumentation
Andrei Trebushinin, Svitozar Serkez, Mykola Veremchuk, Yakov Rakshun, Gianluca Geloni
Summary: A scheme utilizing a step-wise tapered undulator with a segmented structure is proposed to generate wide-bandwidth radiation, suitable for superconducting devices. The resulting radiation from a segmented undulator offers a broadband spectrum and flat-top shape, which can be utilized at a multipurpose beamline.
JOURNAL OF SYNCHROTRON RADIATION
(2021)
Article
Chemistry, Multidisciplinary
Gianluca Geloni, Frank Brinker, Winfried Decking, Jan Gruenert, Marc Guetg, Theophilos Maltezopoulos, Dirk Noelle, Svitozar Serkez, Sergey Tomin, Mikhail Yurkov, Evgeny Schneidmiller
Summary: This study demonstrates the generation of X-ray Free-Electron Laser (XFEL) pulses in frequency mixing mode at the SASE3 line of the European XFEL. By leveraging on nonlinearities generated through longitudinal dispersion in the system, electron bunching is achieved at a frequency difference omega(FM)=omega(2)-omega(1), leading to FEL amplification in the last radiator segments. The method allows for the generation of low photon energies in the mJ level when the target photon energy cannot be reached in the main undulator, with the addition of a short, custom-made afterburner.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Nuclear
Gianluca Geloni, Marc Guetg, Svitozar Serkez, Evgeny Schneidmiller
Summary: This paper reviews the theory of optical klystrons and examines its applications in self-amplified spontaneous emission free electron lasers. It highlights the importance of previously ignored terms in the power gain factor and showcases the differences between known analytical expressions, new findings, and numerical calculations. Additionally, it discusses the potential use of optical klystrons for diagnostics related to electron energy spread and radiation coherence time.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2021)
Article
Physics, Multidisciplinary
Kai Li, Joakim Laksman, Tommaso Mazza, Gilles Doumy, Dimitris Koulentianos, Alessandra Picchiotti, Svitozar Serkez, Nina Rohringer, Markus Ilchen, Michael Meyer, Linda Young
Summary: The study presents a methodology that combines high-resolution photoelectron spectroscopy with a ghost-imaging algorithm to improve the quality of spectral characterization of X-ray free-electron laser pulses. This noninvasive diagnostic method is of great significance for ultrafast X-ray spectroscopy.
COMMUNICATIONS PHYSICS
(2022)