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David Dunning (Science and Technology Facilities Council)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
We present a software framework for digital shadows (one‑way data flow) and digital twins (two‑way closed‑loop synchronisation) for particle accelerators, linking physical machines with virtual counterparts to enable predictive modelling, automated control and improved facility design. The architecture comprises a coherent chain of tools that maintain a unified description of the accelerator....
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Emmanuel Aneke (Northwestern University)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
We demonstrate that a hard X-ray storage ring free-electron laser oscillator (SRFELO) with steady-state output is feasible using nominal APS-U parameters. Numerical simulations using a planar undulator yield a 5.2 keV configuration that exceeds 6% gain, even within a strict 5-meter insertion device limit. We present a comparative study between results using an Elegant and Genesis-based python...
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Michael Ehrlichman (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The accelerator modeling ecosystem at SLAC automates much of the work involved in generating the information that feeds survey & alignment teams, engineering groups, and the controls system. Starting from the same lattice files and modeling codes used to develop Twiss optics and calculate beam properties, quantities including beam stay clears and element locations are produced. These...
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Jingyi Tang (Stanford University)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Cavity-based X-ray free-electron lasers (CBXFELs) are promising sources of fully coherent, stable, high-brightness hard X-rays, but practical implementation at LCLS-II-HE must account for beam-power and beam-dump limitations. In previous work, we proposed an active Q-switched X-ray regenerative amplifier FEL, where electron-beam phase-space manipulation controls the effective cavity quality...
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Dr Henry Freund (University of Maryland, College Park)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Regenerative amplifier x-ray free-electron lasers constitute alternative configurations for fourth generation light sources which are typically operated in self-amplified spontaneous emission (SASE) mode. However, SASE exhibits relatively large fluctuations in the power and spectral properties from shot to shot, whereas XRAFELs provide a much more stable source of hard x-ray photons. Here, we...
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Matthias Scholz (Deutsches Elektronen-Synchrotron DESY)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
Modern FEL operation increasingly relies on advanced software tools, automation, and data-driven optimization methods. At the European XFEL, a strategy is being developed to improve operational efficiency, overall FEL performance, and to reduce the dependence on experts during non-standard operation modes.
Recent developments include automated scanning and tuning procedures, the use of...
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Dylan Kennedy (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
Characterizing the full 6-dimensional phase-space distribution of beams from the LCLS-II photoinjector is essential for understanding and optimizing downstream accelerator performance. Long-term monitoring of this distribution is equally important for detecting drifts in machine state and implementing timely corrective actions. Continuous phase space characterization during routine operation...
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Ming-Chang Chou (National Synchrotron Radiation Research Center)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The energy and energy spread of electron beams from the NSRRC photoinjector were studied for the generation of ultrashort bunches using velocity bunching for a superradiant THz source. A dipole-magnet-based spectrometer was employed to measure the beam energy and relative energy spread from the energy-dispersed beam profile observed on a downstream diagnostic screen. To achieve high energy...
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Qika Jia (University of Science and Technology of China)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
In the article of Rui Prazeres [Phys. Rev.Accel. Beams 19, 060703 (2016)], hereafter the article and the authors, one of the conclusions drawn by the author of the article is that there is a limit to the length of the waveguide, exceeds which a phenomenon of “mode disorder” appears in the cavity. Our analysis indicates that the phenomenon should be caused by the instability of the optical...
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Konstantin Kruchinin (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
Diagnosing the longitudinal profile of ultrashort electron bunches, now reaching femtosecond and attosecond durations in modern Free Electron Lasers and Laser Wakefield Accelerators remains a major challenge, as conventional tools, such as Transverse Deflecting Cavities, lack the required temporal resolution. Coherent radiation spectroscopy provides an attractive alternative. Radiation,...
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Makoto Asakawa (Kansai University)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
We report on the development of a sheet-beam electron source for terahertz Smith–Purcell radiation experiments. A photoemission-based electron gun driven by a femtosecond Ti:sapphire laser produces an elliptical beam of approximately 0.1 mm × 8 mm at 5 keV.
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To control beam divergence along the short axis, a focusing electrode was introduced. Beam profiles were measured using a microchannel... -
Sergei Kladov (University of Chicago)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
Microbunching damping in relativistic electron beams is strongly influenced by inverse dispersive transport terms that couple transverse phase-space coordinates to the longitudinal displacement. In this work, we investigate the use of microbunching damping as a diagnostic and optimization tool for lattice tuning in linear accelerators. In particular, residual dispersion is minimized by...
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Dr Henry Freund (University of Maryland, College Park)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Recent progress in short wavelength FELs from the EUV through x-rays has opened new avenues for industrial and research applications. Most such FELs rely on SASE in which the optical pulse grows from noise in a single pass through the undulator. However, this results in significant shot-to-shot fluctuations in the power and spectrum. Oscillators are under consideration to stabilize the noise...
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Rasmus Ischebeck (Paul Scherrer Institute)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
In addition to the standard FEL operation of SwissFEL, we are developing several advanced FEL modes, where we tailor the phase space of the electron beam before sending it into the undulator. This includes ultra-short pulse and large-bandwidth modes, echo-enabled harmonic generation, and a scheme to generate trains of attosecond FEL pulses.
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These modes require beams with a high 6d phase space... -
Sean OTool (Stanford University)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The Linac Coherent Light Source (LCLS) enables pioneering studies of ultrafast phenomena by producing X-ray pulses with attosecond durations and continuously tunable wavelengths. However, X-ray pump-probe experiments are limited by achievable time delays. While existing magnetic chicanes offer wide delay ranges, they introduce a minimum slippage of 300 as for harmonic schemes, which grows to 5...
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J. Michael Klopf (Helmholtz-Zentrum Dresden-Rossendorf)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
In an FEL oscillator, it is not uncommon to see spectral content at the 3rd and even 5th harmonic of the fundamental lasing wavelength. This arises from on-axis emission from the undulator at the fundamental and odd harmonics. Under proper conditions, FEL oscillations also at the 2nd harmonic are possible, but even harmonics are strongly suppressed due to off-axis emission from the...
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Zhen Zhang (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
High-repetition-rate free-electron laser (FEL) facilities such as LCLS-II rely on continuous-wave (cw) injectors to deliver high-quality electron beams to multiple undulator lines simultaneously. Ensuring injector reliability under nonideal conditions is critical for sustained user operations. In this work, we investigate the fault tolerance of a representative cw photoinjector by analyzing...
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Mauro Siebeneichler Leffever (University of Nevada, Las Vegas, Varian Medical Systems (United States))25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
This work investigates the feasibility of using commercial medical
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linear accelerators as electron sources for compact free electron laser
systems in the mid infrared regime. Representative beam parameters were
defined using product specifications and engineering estimates, then
compared with the infrared free electron laser at the Fritz Haber
Institute. Resonance conditions and Pierce... -
Ming-Chang Chou (National Synchrotron Radiation Research Center)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
NSRRC has been dedicated to providing the superradiant THz free electron laser (FEL) for scientific research users in recent years. Linac-based coherent superradiant THz FELs produced by the NSRRC high brightness photoinjector, which has been installed in the Accelerator Test Area (ATA), is served for users. Users in different research fields have different requirements for THz FEL...
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Mikhail Krasilnikov (Deutsches Elektronen-Synchrotron DESY)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
A new generation of normal-conducting 1½-cell L-band RF photoguns (Gun5) has been developed at DESY for long-pulse operation at the European XFEL. Compared to the previous generation (Gun4), Gun5 supports RF pulses up to 1 ms at 10 Hz while maintaining an accelerating gradient of 60 MV/m at the cathode (~70 kW average RF power in the gun cavity). Key design improvements include an elliptical...
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Frank Stephan (Deutsches Elektronen-Synchrotron DESY)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The Photo-Injector Test facility at DESY in Zeuthen (PITZ) is designed to characterize and optimize L-band photo-electron sources. As such, it has many diagnostics and tools available to measure the beam quality close to the gun. To ensure all components near the gun are properly aligned, four pairs of fiducial magnet nests were installed around the gun; approximately 50 cm from the beam axis....
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Heishun Zen (Kyoto University)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
A new 1.6-cell photocathode RF gun has been installed at the Kyoto University Free-Electron Laser (KU-FEL) facility to increase its peak power for high-harmonic generation (HHG) in gas. During the 2022 Phase I commissioning, which utilized a copper photocathode, the electron bunch charge was limited to 60 pC due to low quantum efficiency (QE). To address this, a semiconductor thin film (CsTe...
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Zhen Zhang (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
We present a robust method for generating custom-shaped, coherent hard X-ray pulses in regenerative amplifier free-electron lasers (RAFELs) using laser-induced energy modulation of the electron beam. A temporally shaped optical modulation imprints an optical-wavelength energy pattern on the beam, which interacts with the recirculated seed in the X-ray cavity to generate spectral sidebands....
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Ankur Dhar (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
One pathway to producing high brightness electron beams for future light sources is to use a radio-frequency (rf) driven high field photogun to rapidly accelerate photoemitted electrons to the relativistic regime and preserve the brightness. However, the highest attainable field is limited by rf breakdowns of materials used in a photogun. Shortening rf pulse duration feeding into a photogun...
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Heishun Zen (Kyoto University)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
The post-compression of femto-second pulsed lasers utilizing spectral broadening in solid and gas is now commonly used for obtaining few-cycle pulses. In the long-wavelength infrared (LWIR) region, solid targets such as ZnSe, and KRS-5 has been utilized*. I performed spectral broadening experiment with a 3-mm-thick KRS-5 plate at the FEL wavelength of 11 micro-m to see what would happen when...
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Mikhail Krasilnikov (Deutsches Elektronen-Synchrotron DESY)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
Beam dynamics studies have been performed to optimize the brightness of a superconducting radio-frequency (SRF) photoinjector for the CW option of the European XFEL. A superconducting L-band 1.6-cell cavity is considered as a high-brightness electron source capable of CW operation and meeting stringent beam quality requirements. Due to the limited achievable accelerating gradient in the SRF...
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Sebastian Aderhold (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The Linac Coherent Light Source superconducting linac (LCLS-SC) at SLAC National Accelerator Laboratory, built during the LCLS-II project, has been in operation since 2023, with user experimental delivery commencing in 2024. In 2026, the LCLS-II-HE project is adding 23 additional 1.3 GHz cryomodules, bringing the LCLS-SC maximum electron beam energy from 4 GeV to 8 GeV. This poster will...
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Heishun Zen (Kyoto University)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Kyoto University Free Electron Laser (KU-FEL) facility has been developed for energy-related research by the Institute of Advanced Energy, Kyoto University. There are two accelerator-driven infrared coherent light sources in the facility. One is the oscillator-type FEL whose wavelength range is 3.4 to 26 micro-m*. The other one is the THz-Coherent Undulator Radiation (THz-CUR) source whose...
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J. Michael Klopf (Helmholtz-Zentrum Dresden-Rossendorf)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
FELs have a long history of delivering intense tunable narrowband THz and IR radiation for a vast array of applications. Nearly all THz/IR FELs are oscillators that utilize an optical resonator to achieve the extremely high spectral brightness of transform-limited optical pulses. Due to the dynamics of the FEL process, FEL-oscillators must operate with an optical resonator “detuned” from...
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Tyler Kabana (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
As the SLAC high-level applications environment begins migrating towards Python-based frameworks, rigorous validation against legacy tools is critical for operational continuity. We present a comprehensive benchmarking study comparing a new Python wire scanner analysis framework (slac-tools) against legacy MATLAB software at LCLS using 379 historical datasets from routine operations since...
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Federico Vismarra (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
We propose a novel photoelectron streaking technique for free-electron laser facilities, enabling simultaneous, in situ characterization of attosecond soft X-ray pulses and the relativistic electron beam that generates them*.
Our device combines solid-state valence photoemission driven by FEL soft-X-ray pulses with co-propagating, THz-like transient electric field of the electron beam...
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Qika Jia (University of Science and Technology of China)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
The infrared free electron laser project FEL-HMF of Anhui university was launched in May 2022. The facility integrate free electron laser, strong magnetic field, and low-temperature environment for material science research and other research. The project is scheduled to commission and lasing this year. The progress and the current status (results of the commissioning) of the project are reported here.
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Sona Chandran P (Raja Ramanna Centre for Advanced Technology)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
The Infrared Free Electron Laser (IR-FEL) at the Raja Ramanna Centre for Advanced Technology (RRCAT) is the first operational FEL based user facility in India, delivering radiation in the wavelength range of 12.5-50 µm. At a repetition rate of 2 Hz, a CW average power >20 mW, micro-pulse peak power ~ 10 MW, micro-pulse energy ~100 µJ and peak spectral brightness up to...
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Timothy Suzuki (Michigan State University)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
Potassium tantalate niobate (KTN) is a paraelectric perovskite crystal with a strong quadratic electro-optic effect near its Curie temperature, making it a promising material for high-speed optical beam deflection*. Electrode design strongly influences the electric-field uniformity, drive voltage, fringe fields, and dielectric-breakdown risk in KTN deflectors. Based on electrostatic...
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Ingmar Hartl (Deutsches Elektronen-Synchrotron DESY)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
The recently installed NEPAL photocathode lasers at FLASH, PITZ and the European XFEL, deliver exceptional stability, reliability, and flexibility for XFEL operation. Their programmable spectral filter enables precise control of intensity and phase of the near-infrared seed-laser pulses which are then nonlinearly amplified and wavelength converted to UV. We developed an adaptive pulse-shaping...
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Jinguo Wang (Shanghai Advanced Research Institute)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The Shanghai High Repetition Rate XFEL and Extreme Light Facility (SHINE) requires a facility-wide synchronization system with femtosecond-level stability to support high-brightness FEL operation and ultrafast pump–probe experiments. This paper presents the design of the optical synchronization system developed for SHINE. A mode-locked optical master oscillator is employed as the central...
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Senlin Huang (Peking University)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
The construction of a platform for terahertz (THz) radiation research at Peking University has been completed recently. The platform consists of a DC-SRF-II photocathode gun, an superconducting radio-frequency (SRF) linac equipped with two 9-cell TESLA-type cavities, a magnetic chicane for electron bunch compression, and a 40-period undulator with taper control. By integrating with an...
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AKASH CHANDRA BEHERA (Fritz Haber Institute of the Max Planck Society)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
The infrared free-electron laser (IR-FEL) at the Fritz Haber Institute recently commissioned a two-color upgrade, enabling simultaneous lasing with two IR FEL oscillators with independently tunable wavelength. This is realized by employing a high-frequency kicker cavity to feeding alternating electron bunches from within the 1GHz bunch train into the two separate IR FEL oscillators. Within...
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Kevin Eckrosh (Arizona State University, Biodesign Institute)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
Recent years have seen a growing interest in developing x-ray sources that are cheaper and more compact than conventional XFELs and synchrotrons. The Compact X-ray Light Source (CXLS) at Arizona State University achieves this using Inverse Compton scattering to produce a high-brightness, short pulse duration x-ray beam. This source operates in blowout mode, meaning a high-charge, short-bunch...
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Levi Fisher (University of Hawaiʻi at Mānoa)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Cavity desynchronization is important in FEL oscillators, especially in the IR and THz regimes where optical slippage is significant and laser lethargy can reduce gain under perfect synchronism. Because fast mechanical cavity tuning is difficult, several facilities have implemented dynamic desynchronization by sweeping the electron bunch repetition rate through upstream RF phase control,...
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Dr Francesca Addesa (Paul Scherrer Institute)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
At the Paul Scherrer Institute (PSI), nanotechnology has been successfully employed to develop minimally invasive Wire Scanners with sub-micrometer spatial resolution for monitoring the transverse beam size at SwissFEL during lasing operation. The devices consist of a monolithic low-stress Si₃N₄ structure with a C-shaped silicon fork, integrating two perpendicular wires for full transverse...
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Franz-Josef Decker (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 10: Electron Diagnostics, Timing, Synchronization, and ControlsPoster Presentation
The energy of the beam is 5 to 10 times more stable than the beam powered by the LCLS Copper Linac due to the continuous wave (CW) operation of the superconducting (SC) Linac. Transversely, we have identified Injector Laser movements on the cathode of RF Gun (low frequency to a few Hz). Some 60 Hz lines from spreader kicker were seen and corrected by timing adjustments of the kicker pulse....
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Yuri Shvyd'ko (Argonne National Laboratory)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Cavity-based X-ray free-electron lasers (CBXFELs) require tunable X-ray crystal cavities to broaden their practical utility. However, the previously proposed four-crystal bow-tie design has a lateral footprint comparable to the undulator length, limiting its deployment in accelerator tunnels. Here, we introduce a compact, broadly tunable X-ray cavity comprising six Bragg-reflecting crystals...
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Madison Singleton (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 6: FEL Oscillators and Infrared FEL (IR-FEL)Poster Presentation
Cavity-based X-ray free-electron lasers (CBXFELs), including the X-ray regenerative amplifier FEL (XRAFEL) and the XFEL oscillator (XFELO), have been proposed as sources of highly coherent and stable hard X-rays. XRAFELs can generate high-peak-power X-ray pulses with bandwidths limited by Bragg-crystal filtering, whereas XFELOs provide much narrower bandwidths but at substantially lower peak...
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Theodore Vecchione (SLAC National Accelerator Laboratory)25/08/2026, 16:00Session 7: Electron SourcesPoster Presentation
Significant progress has been made in the performance of the LCLS-II photoinjector and its photocathode subsystem. Cs₂Te photocathodes are now routinely produced with uniform, high initial quantum efficiency (QE) and Coulomb-level lifetimes. However, unexpected photocathode dynamics have emerged as an operational challenge. Over longer timescales, initially uniform QE develops spatial...
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