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Yu NAKATA (The University of Tokyo, RIKEN SPring-8 Center)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Recent advances in X-ray free-electron lasers (XFEL) have opened new opportunities for X-ray nonlinear optics and transient dynamics in condensed matter*. Tight focusing of XFEL pulses is essential for generating the high intensities required for nonlinear X-ray processes and for achieving high-spatial-resolution imaging of ultrafast dynamics. However, 100-nm focusing of soft X-rays remains...
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Nicholas Matlis (Arizona State University)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
The Compact X-ray Light Source (CXLS) at Arizona State University is a compact inverse-Compton-scattering (ICS) facility designed to provide femtosecond hard X-rays in a university laboratory environment. CXLS has entered commissioning and early-science operation, demonstrating stable operation of a 9.3 GHz X-band accelerator, synchronized picosecond laser systems, and femtosecond hard X-ray...
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Maofei Qian (Argonne National Laboratory)26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
A 13.5-nm SASE FEL based on a force-neutral, phase-adjustable undulator (FNAPU) with integrated FODO focusing has been simulated. For an undulator period of 28 mm and K = 2.32, simulations assuming a 1-GeV electron beam with 0.5-mm·mrad normalized emittance and 3-kA peak current show that the integrated focusing maintains an rms beam size of approximately 20 μm, enabling saturation in about 6...
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Adil Ansari (Arizona State University)26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
X-ray free-electron lasers (XFELs) provide exceptional brightness and ultrafast capabilities but face high demand for beamtime. Compact X-ray light sources (CXLS) aim to reduce facility size and cost, enabling broader access to a subset of XFEL experiments and complementing large-scale facilities.
We present the development of a digital twin for key CXLS components, designed for system...
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Liubov Samoylova (European X-Ray Free-Electron Laser)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
We present results of modeling of the FEL radiation used in pump probe experiment at BL3 at SACLA free electron laser. 160 pC, 8 GeV electron bunch produces two photon pulses with different photon energies (color1: 8 keV and color 2: 9 keV) when consecutively passing two undulator sections. First color is filtered by Si111 monochromator to the bandwidth of 0.02% (pulse energy is 0.1 uJ)....
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John Walters (Stanford University)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
We use attosecond interferometry to diagnose the temporal profile of attosecond pulse trains generated with a seeded free electron laser. A harmonic train is generated using the FERMI free electron laser with a seeding field of 266 nm. This harmonic pulse train is overlapped with a second 266 nm pulse at the Low Density Matter beamline. Two color photoemission in helium was analyzed using a...
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Dr Ekaterina Jung (WAIV FTIR GmbH)26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
Spectral diagnostics of infrared and THz free electron lasers typically rely on either laser-based techniques or large benchtop FTIR systems, making alignment and beamline integration time-consuming. We present AURA, the most compact broadband FTIR spectrometer developed by WAIV FTIR GmbH, covering a continuous spectral range from 3 to 600 µm (100 THz to 0.5 THz). The instrument fits in a 130...
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Fumio Shishikura (Nihon University)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Free-electron lasers (FELs) are valuable light sources for examining the biological effects of mid-infrared radiation on living organisms. We investigated the compound eyes of two arthropod species, crayfish (Procambarus clarkii, Crustacea) and crickets (Gryllus bimaculatus, Insecta), using LEBRA-FEL (3–6 μm) and KU-FEL (3.4–26 μm) as radiation sources. In both cases, the...
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Zoltán Tibai (University of Pecs)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Efficient acceleration has been demonstrated using dielectric waveguides driven by multi-cycle THz pulses. Further improvements were achieved by employing sequential THz sources and waveguide structures, enabling cascaded acceleration* . The cascaded THz-driven dielectric electron accelerator proposed here provides enhanced acceleration efficiency while enabling electron bunch compression. A...
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Xiujie Deng (Tsinghua University)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
In this paper, we will report the property of SSMB radiaiton, like the power, bandwidth, and spectral brightness.
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Mario Balcazar (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
We present results from the commissioning of the X-ray optics motion and photon diagnostics systems for the cavity-based X-ray free-electron laser (CBXFEL) project, a partnership among Argonne National Laboratory (ANL), SLAC National Accelerator Laboratory, and RIKEN SPring-8. The project aims to demonstrate CBXFEL technology using X-rays produced in the first seven hard X-ray undulators of...
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Ji Qiang (Lawrence Berkeley National Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
High-brightness X-ray Free Electron Lasers (FELs) are transformative tools for scientific discovery. However, most existing FELs are kilometer-scale facilities with high construction costs and low repetition rates, limiting their accessibility and throughput. This paper proposes a compact, high-repetition-rate (MHz) EUV to 1 nm soft X-ray FEL with a footprint of less than 100 meters. The...
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Philippe Piot (Argonne National Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Increasing the number of X-ray free electron laser (XFEL) facilities and capabilities across the United States is critical to keep pace with the growing demand from the user community. We are exploring a novel concept based on two-beam acceleration technology, with a focus on delivering coherent X-ray pulses with agile and customizable properties. The Coherent Agile Pulse at Argonne X-ray...
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Federico Vismarra (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Soft-X-ray attosecond spectroscopy at FELs provides direct access to ultrafast electronic dynamics in matter with simultaneous sub-femtosecond resolution and atomic-site specificity*. By exploiting core-level transitions, these approaches offer a localized and phase-sensitive probe of electronic coherence, extending attosecond science beyond valence dynamics into the regime of strongly...
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Dr Henry Freund (University of Maryland, College Park)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
The application to FELs has become a research interest after improvements in laser-plasma-accelerator (LPA) beam quality and reliability, [1,2]. The goal is for more compact light sources due to the high gradients in the LPA. However, the FEL output from ultra-short LPA electron bunches (at the 20-fs level) is dominated by the rapid slippage of the beam behind the optical pulse in two LPA-FEL...
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Johann Eduardo Baader (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
A magnetic measurement test stand has been developed to reduce the workload and time required for the final tuning of the LCLS-II-HE soft X-ray undulators. The test stand includes a touch probe for mechanical measurements, a Hall probe for local field measurements, and a stretched wire system for field integral measurements. The test stand enables early magnetic alignment and magnetic field...
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Rafi Hessami (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
The ongoing Plasma-driven Attosecond X-ray source experiment (PAX) at FACET-II aims to produce coherent soft X-ray pulses of attosecond duration using a plasma wakefield accelerator [1]. These X-ray pulses can be used to study chemical processes where attosecond-scale electron motion is important. For this first stage of the experiment[KS1.1], PAX plans to demonstrate that <100 nm bunch length...
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Zhaoheng Guo (École Polytechnique Fédérale de Lausanne, Paul Scherrer Institute)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
We demonstrate the generation of both soft and hard X-ray attosecond pulses at SwissFEL, based on the temporal shaping of the photocathode laser pulses. Through flexible bunch compression schemes, the electron beam current profile evolves from a double-Gaussian shape with 10 ps duration into a femtosecond-scale isolated high-current spike in the core of a tens-of-femtosecond-long electron...
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Claudio Emma (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
FACET-II is a National User Facility at SLAC focusing on research in the areas of advanced acceleration and coherent radiation techniques with high-energy electron beams [1]. This contribution summarizes recent experimental results relevant for FEL and high brightness beam applications including the generation of extremely high current beams through laser-electron phase space manipulation [2],...
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Nathan Burger (RadiaBeam Technologies (United States))26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
Conventional variable gap undulators rely on mechanically complex, force intensive support systems that limit tuning speed, alignment stability, and operational reliability—challenges that are increasingly critical for next generation free electron lasers (FELs). In collaboration with Argonne National Laboratory (ANL), RadiaBeam Technologies is advancing ANL’s Force Neutral Adjustable Phase...
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Paris Franz (xLight)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
Harmonic lasing is an advanced FEL concept to produce short wavelengths with a low-energy electron beam by developing lasing at an odd harmonic of the FEL fundamental wavelength. Harmonic lasing self-seeded (HLSS) FEL uses a two-stage high-gain FEL with the first stage being a harmonic lasing FEL to produce the coherent seed for the second stage which serves as a high-gain FEL amplifier. HLSS...
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Chance Ornelas-Skarin (Stanford University)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
The microscopic structure and dynamics of valence electrons determine many of a material's properties, including its optical ones. Conventional x-ray scattering can resolve the angstrom-scale electronic structure, but it is difficult to separate the valence electrons from the more localized core electrons. Here we report nonlinear x-ray scattering measurements from optically-driven valence...
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Csaba Nemeth (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 11: Undulators and Photon Beamline InstrumentationPoster Presentation
Polarization control of high-intensity coherent X-ray light is essential for many experiments, including magnetic spectroscopy and studies of chiral molecular structure. However, most free-electron laser facilities rely on planar undulators for light generation, which are generally unable to provide polarization tunability. Counterintuitively, analytical solutions of Maxwell's equations...
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Pardis Niknejadi (Deutsches Elektronen-Synchrotron DESY)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
A theoretical framework for understanding and controlling mode selection in echo-enabled harmonic generation (EEHG) free-electron lasers (FELs) at high harmonic numbers is presented. In EEHG, adjacent harmonics naturally exhibit comparable microbunching amplitudes, creating a unique opportunity to work with different spectral components. To capture this process, we benchmark orthogonal...
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Samuel Barber (Lawrence Berkeley National Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Several demonstration experiments of laser plasma accelerator (LPA) driven free electron lasers (FEL) have emerged in the past 5 years [1,2] and are paving the path towards compact light sources. The electron beams generated in plasma accelerators differ significantly from those produced in RF-based photoinjectors and linear accelerators, which drive all existing XFELs. LPAs exhibit larger...
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Haoyuan Li (Linac Coherent Light Source)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Ultrafast optical laser-based techniques have enabled the probing of atomistic processes at their intrinsic temporal scales with femto- and attosecond resolution.
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However, the long wavelengths of optical lasers have prevented their interrogation and manipulation with nanoscale spatial specificity.
Advances in hard X-ray free-electron lasers have enabled progress in developing X-ray... -
Simone Di Mitri (Elettra-Sincrotrone Trieste S.C.p.A.)26/08/2026, 17:00Session 8: Electron Beam DynamicsPoster Presentation
The systematic comparison of two semi-analytical models of microbunching instability affecting electron beams in single pass or recirculating linear accelerators is reported. The comparison is comprehensive of numerous features of the instability, and enriched by three different expressions to calculate intrabeam scattering. The inclusion of this effect allows the recovery of agreement with...
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Suren Karabekyan (European X-Ray Free-Electron Laser)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
The variable polarization afterburner at the European XFEL was successfully commissioned in early 2024. It consists of four APPLE-X undulators installed behind the SASE3 planar undulator system, generating the free-electron laser pulses for the soft X-ray beam lines. The afterburner has now become an integral part of the European XFEL and is used for various experiments. These include...
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Cagri Erciyes (Max Planck Institute for Nuclear Physics)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Free-electron lasers (FELs) deliver the brightest coherent X-ray pulses for atomic-resolution ultrafast science, yet scaling to extreme peak powers and attosecond durations faces a fundamental barrier: in the ultrahigh-current regime, longitudinal space-charge fields impose slice-dependent energy detuning that suppresses gain and confines efficient lasing to a small bunch fraction. We...
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Kelly Swanson (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Electron bunches with attosecond-scale bunch durations and high peak currents would enable new opportunities for next-generation light sources. However, to generate such short bunches requires novel compression techniques. Here we consider plasma-based compression, a method which exploits the inherently large accelerating fields in a plasma wakefield accelerator, to add an energy-time...
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Lingen Huang (Helmholtz-Zentrum Dresden-Rossendorf)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Heating and ionization are among the most fundamental processes in relativistic laser--solid interactions; however, their spatiotemporal evolution remains challenging to capture experimentally. Here we present detailed diagnosis of high-intensity laser interactions with wire targets, leveraging the extreme spectral brightness of an X-ray free-electron laser in sub-picosecond time-resolved...
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Melanie Murillo (Stanford University)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
We present a Dielectric Laser Accelerator concept for achieving tunable interactions with electron beams using silicon photonic integrated circuits to program laser phase fronts. Our photonic circuit is an 8x8 binary tree mesh of Mach-Zehnder Interferometers (MZIs), enabling routing, splitting, and recombination of light via adjustable thermal phase shifters. We couple 2.2 um, 330 fs FWHM...
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Jack Hirschman (Stanford University, SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
Next-generation x-ray free-electron lasers operating at MHz repetition rates require fast, flexible source-level actuators for adaptive and autonomous operation.* The photoinjector drive laser, mapping directly onto the electron beam's initial longitudinal phase space, represents a powerful and largely unexplored upstream handle. Here we present the first demonstration of programmable...
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Simone Di Mitri (Elettra-Sincrotrone Trieste S.C.p.A.)26/08/2026, 17:00Session 3: FEL theory and Machine LearningPoster Presentation
An update version of the brilliance plot in units of 0.01% relative bandwidth is proposed, including most recent planned and running 4th generation multi-bend storage ring light sources. It is then shown that, in order to match experimental and simulated data, the calculation has to take into consideration a non-uniform electron current profile in self-amplified spontaneous emission, and the...
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Federico Vismarra (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
Attosecond pump-probe experiments are a long-sought tool to observe electronic processes on their natural timescales; however, slippage during FEL amplification complicates the ability to set short delays. At LCLS, we have recently demonstrated pump-probe measurements with sub-fs delays by using harmonic pulse pairs (w/2w). A soft x-ray delay line will enable general two-color operation, but...
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Jenny Morgan (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
We present simulations demonstrating single-cycle waveform control of undulator radiation using an ultrashort electron beam produced by a plasma wakefield accelerator. By operating in a regime where the resonant radiation wavelength exceeds the effective bunch length of the compressed current spike, the emitted electric field closely follows the structure of the undulator magnetic field. This...
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Yuri Shvyd'ko (Argonne National Laboratory)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Momentum-resolved inelastic x-ray scattering (IXS) probes the dynamical structure factor S(Q,ω) in solids, liquids, biological systems, and quantum materials, providing access to phonons, magnons, and charge, orbital, and valence excitations on meV energy scales and nm$^{−1}$ momentum scales. Although IXS is a well-established technique at storage-ring sources, its broader impact is limited by...
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Tehya Andersen (Lawrence Berkeley National Laboratory, University of California, Berkeley)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Free-electron lasers (FELs) driven by electron beams generated by laser-plasma-accelerators (LPAs) offer an attractive avenue towards compact, high brightness and short wavelength coherent light sources. The BELLA Center LPA FEL facility at the Lawrence Berkeley National Laboratory delivers few fs-duration, 40-80 pC electron bunches of 100 MeV energy, 4% FWHM energy spread, at a 1Hz repetition...
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Jenny Morgan (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 12: Advanced FEL ModesPoster Presentation
There has been significant interest in generating orbital angular momentum (OAM) pulse pairs at free-electron lasers, either through direct OAM seeding schemes or via harmonic emission in helical undulators. In such schemes the pulses are temporally separated; while coherent superpositions of OAM modes can be identified from their transverse interference patterns, this approach fails when the...
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Aliaksei Halavanau (SLAC National Accelerator Laboratory), Dr Claudio Pellegrini (SLAC National Accelerator Laboratory)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
We report on the progress of the design and development of an X-ray Laser Oscillator (XLO) based on population inversion, to be driven by the LCLS-II-HE free-electron laser currently under construction at SLAC National Accelerator Laboratory. The XLO concept exploits the brightness, high repetition rate (up to 1 MHz), and tunability of LCLS-II-HE photon beam to generate population inversion in...
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Xiujie Deng (Tsinghua University)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
In this paper, we propose to combine two promising research topics in accelerator physics, i.e., optical stochastic cooling (OSC) and steady-state microbunching (SSMB). Our study shows that such an OSC-SSMB storage ring with a circumference of 50 m and beam energy of several hundred MeVs using present technology can deliver kilowatt radiation at 100 nm wavelength. A more ambitious application...
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Nicholas Matlis (Arizona State University)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
We investigate generation of structured X-rays at ~9 keV energies via inverse Compton scattering (ICS) of 1030 nm structured light from ~20 MeV electrons. Structured light at X-ray photon energies enables entirely new ways of probing and controlling matter at the atomic and nanoscale, including accessing chiral, magnetic, and orbital-selective interactions that are invisible to conventional...
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XINGYU SU (The University of Tokyo)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Nonlinear spectroscopy in the XUV and soft-X-ray regions offers a unique route to combine the symmetry sensitivity of optical nonlinear processes with the element and orbital selectivity of core-level resonances. We present an experimental platform for time-resolved XUV-to-soft-X-ray nonlinear spectroscopy at FEL sources, using second-harmonic generation as a representative nonlinear probe....
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Hankai Zhang (École Polytechnique Fédérale de Lausanne, Paul Scherrer Institute)26/08/2026, 17:00Session 13: Science ApplicationsPoster Presentation
Ultrafast imaging enables the investigation of nanoscale dynamics in single particles using individual X-ray pulses. Accurate interpretation of such images requires understanding the strong interaction between the X-ray pulse and the sample, particularly when the electronic structure effects is of interest.
We investigate ultrafast X-ray--induced dynamics in sodium iodide (NaI)...
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Dr Wei-Yuan Chiang (National Synchrotron Radiation Research Center)26/08/2026, 17:00Session 9: Novel Accelerator and FEL ConceptsPoster Presentation
Laser wakefield accelerators (LWFAs) have emerged as promising compact drivers for free-electron lasers (FELs), owing to their ability to produce femtosecond electron beams with high peak current over centimeter-scale acceleration distances. However, their relatively large energy spread remains a key challenge for achieving high-gain FEL operation. While magnetic compression can effectively...
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