Article
Multidisciplinary Sciences
Z. T. Zhao, Z. Wang, C. Feng, S. Chen, L. Cao
Summary: The paper explores the combination of ERL with angular-dispersion induced microbunching technique to generate fully coherent radiation pulses with high average brightness and tunable pulse length. Start-to-end simulations based on a low energy ERL show promising results in generating coherent EUV radiation pulses with high brightness and power using the proposed technique. Further discussions are made on extending the proposed scheme to shorter wavelength based on an ERL complex.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Peter Walter, Micheal Holmes, Razib Obaid, Lope Amores, Xianchao Cheng, James P. Cryan, James M. Glownia, Xiang Li, Ming-Fu Lin, May Ling Ng, Joseph Robinson, Niranjan Shivaram, Jing Yin, David Fritz, Justin James, Jean-Charles Castagna, Timur Osipov
Summary: Free-electron lasers (FEL) have provided new approaches to Atomic and Molecular Optical Science, one of which is observing ion dynamics by tracking photo electrons. The designed Dynamic Reaction Microscope (DREAM) endstation can detect the photon-matter interactions by detecting ions and electrons in coincidence, offering scientific opportunities in a wide range of domains.
APPLIED SCIENCES-BASEL
(2022)
Article
Instruments & Instrumentation
Lu Cao, Junhao Liu, Zhen Wang, Dazhang Huang, Chao Feng, Zhentang Zhao
Summary: This paper presents the design of a multiplexed emitting system that can maintain microbunching and beam quality, producing ultrashort, fully coherent high-repetition-rate EUV and X-ray radiation. The proposed method holds potential in the multi-beamline operation of ERL- or storage-ring-based coherent light sources.
JOURNAL OF SYNCHROTRON RADIATION
(2023)
Article
Instruments & Instrumentation
Peter Walter, Timur Osipov, Ming Fu Lin, James Cryan, Taran Driver, Andrei Kamalov, Agostino Marinelli, Joe Robinson, Matthew H. Seaberg, Thomas J. A. Wolf, Jeff Aldrich, Nolan Brown, Elio G. Champenois, Xinxin Cheng, Daniele Cocco, Alan Conder, Ivan Curiel, Adam Egger, James M. Glownia, Philip Heimann, Michael Holmes, Tyler Johnson, Lance Lee, Xiang Li, Stefan Moeller, Daniel S. Morton, May Ling Ng, Kayla Ninh, Jordan T. O'Neal, Razib Obaid, Allen Pai, William Schlotter, Jackson Shepard, Niranjan Shivaram, Peter Stefan, Xiong Van, Anna Li Wang, Hengzi Wang, Jing Yin, Sameen Yunus, David Fritz, Justin James, Jean Charles Castagna
Summary: The newly constructed TMO instrument at SLAC National Accelerator Laboratory utilizes two linear accelerators to support various experimental techniques, enabling research in atomic, molecular and optical, strong-field and nonlinear science. It also has high focusing capability.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Instruments & Instrumentation
T. A. Assefa, M. H. Seaberg, A. H. Reid, L. Shen, V Esposito, G. L. Dakovski, W. Schlotter, B. Holladay, R. Streubel, S. A. Montoya, P. Hart, K. Nakahara, S. Moeller, S. D. Kevan, P. Fischer, E. E. Fullerton, W. Colocho, A. Lutman, F-J Decker, S. K. Sinha, S. Roy, E. Blackburn, J. J. Turner
Summary: The development of new modes at x-ray free electron lasers has led to innovative methods for studying fluctuations at different energies and timescales. A pair of advanced instruments were used to conduct experiments on quantum materials, including testing the proof-of-principle of resonant magnetic scattering using ultrafast pulses and studying fluctuations using a fast area detector. Various diagnostics for single-shot contrast measurements were also employed to normalize data and calibrate pulse amplitude ratios, which are crucial for the study of material fluctuations. The results obtained with the instrument demonstrate higher momentum resolution.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Optics
Li Jin
Summary: This study demonstrates performance manipulation of squeezed coherent light source based on four-wave mixing in alkaline-earth atoms, with controllable spectral purity and stability. The analysis of the Langevin noise fluctuations reveals that the relative-intensity noise spectrum of the wave-mixing lasing is well below the standard quantum limit, opening new possibilities for laser stabilization and precision metrology.
Article
Nanoscience & Nanotechnology
Sara Mikaelsson, Jan Vogelsang, Chen Guo, Ivan Sytcevich, Anne-Lise Viotti, Fabian Langer, Yu-Chen Cheng, Saikat Nandi, Wenjie Jin, Anna Olofsson, Robin Weissenbilder, Johan Mauritsson, Anne L'Huillier, Mathieu Gisselbrecht, Cord L. Arnold
Summary: Attosecond pulses, produced through high-order harmonic generation in gases, have been used to observe ultrafast electron dynamics, overcoming limitations of low repetition rates. By using short pulse trains, experiments have been conducted on single-photon double ionization of helium with full angular resolution.
Article
Chemistry, Multidisciplinary
Dominik Hoeing, Robert Salzwedel, Lena Worbs, Yulong Zhuang, Amit K. K. Samanta, Jannik Lubke, Armando D. D. Estillore, Karol Dlugolecki, Christopher Passow, Benjamin Erk, Nagitha Ekanayake, Daniel Ramm, Jonathan Correa, Christina C. Papadopoulou, Atia Tul Noor, Florian Schulz, Malte Selig, Andreas Knorr, Kartik Ayyer, Jochen Kupper, Holger Lange
Summary: Currently, the dynamics of optically excited plasmonic nanoparticles are explained as a series of scattering events caused by nanoparticle breathing oscillations initiated by statistical heat transfer from thermalized electrons to the lattice. However, a phase mismatch between theory and experiments suggests an additional excitation mechanism. Through optical transient absorption spectroscopy and time-resolved single-particle X-ray diffractive imaging, we found that optically induced electron density gradients are the initial driving source for breathing oscillation and confirmed the need for an additional excitation mechanism for thermal expansion. Our new model reproduces all experimental observations.
Article
Physics, Nuclear
F. Zhou, C. Adolphsen, A. Benwell, G. Brown, M. Dunning, S. Gilevich, K. Grouev, G. Huang, B. Jacobson, X. H. Liu, A. Miahnahri, F. Sannibale, J. Schmerge, T. Vecchione
Summary: The LCLS-II project at SLAC is constructing a 1.3 GHz superconducting rf (SRF) linac to generate 4 GeV electron bunches at a high repetition rate for x-ray free electron lasers. The electron source includes the first three meters of the electron injector, comprising two normal-conducting, continuous-wave rf cavities designed and built by Lawrence Berkeley National Laboratory based on their advanced photoinjector experiment program. Installation of the source was completed in mid-2018, ahead of the SRF linac, and commissioning over a two-year period has resulted in characterization of electron beam and dark current.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2021)
Article
Instruments & Instrumentation
Weihang Liu, Chao Feng, Yi Jiao, Sheng Wang
Summary: To improve the coherence of electron beams generated in laser plasma accelerators (LPAs), researchers have proposed various methods for generating strong microbunching, one of which involves using a seed laser to induce energy modulation and transverse-longitudinal coupling beamlines to convert it into strong density modulation. Compared with traditional angular modulation methods, this approach can achieve similar radiation performance with lower power.
JOURNAL OF SYNCHROTRON RADIATION
(2021)
Article
Nanoscience & Nanotechnology
Yingying Zhang, Xin Xue, Mingxi Fang, Gaoju Pang, Yujuan Xing, Xinyu Zhang, Lianyue Li, Qu Chen, Yuxin Wang, Jin Chang, Peiqi Zhao, Hanjie Wang
Summary: In this paper, a light control engineered bacteria system based on UCNP-mediated TRI was constructed for colorectal cancer theranostic and therapy, which could achieve accurate tumor diagnosis and light-controlled cancer therapy.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Heonoh Kim, Osung Kwon, Han Seb Moon
Summary: The study experimentally demonstrates the two-photon interference of two phase-randomized weak coherent pulses using time-resolved coincidence detection technique. The mutual coherence time between the two weak coherent lights is determined by applying frequency noise to one of the interfering lights, and the HOM-type TPI fringe visibility is analyzed based on the ratio of coherence time to pulse duration.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Nuclear
Eduard Prat, Paolo Craievich, Philipp Dijkstal, Simone Di Mitri, Eugenio Ferrari, Thomas G. Lucas, Alexander Malyzhenkov, Giovanni Perosa, Sven Reiche, Thomas Schietinger
Summary: This study presents high-resolution measurements of the electron beam energy spread at the SwissFEL injector. The measured values are generally an order of magnitude higher than predicted by simulation codes, indicating that the energy spread blowup is primarily caused by intrabeam scattering and microbunching instabilities. The study also proposes a numerical model to reproduce the experimental data and an approach to mitigate the energy spread deterioration.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2022)
Article
Physics, Applied
Dekel Raanan, Man Suk Song, William A. Tisdale, Dan Oron
Summary: This study extends image scanning microscopy to second harmonic generation (SHG) by extracting the complex field amplitude of the second-harmonic beam, allowing for super-resolved phase-sensitive SHG microscopy.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Nuclear
Ryan Humble, Finn H. O'Shea, William Colocho, Matt Gibbs, Helen Chaffee, Eric Darve, Daniel Ratner
Summary: Accelerators produce a large number of signals that require experts to interpret. The current diagnostic methods for rf stations are limited, resulting in manual anomaly detection. This study proposes a beam-based method that can automate the identification of changes in accelerator status, with fewer false positives compared to traditional rf station diagnostics.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2022)