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Chengkun Huang (Los Alamos National Lab)27/07/2026, 13:30To be considered for Working Group talk
Beam brightness can be enhanced with high gradient operation in photocathode guns. Such high gradient guns, such as the L-band gun at the Argonne Wakefield Accelerator (AWA) facility and the C-band high gradient gun being commissioned in the CARIE project at Los Alamos National Laboratory, are also typically equipped with semiconductor photocathodes due to their high quantum efficiency. To...
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Yiheng Ye (SLAC/Stanford)27/07/2026, 13:50To be considered for Working Group talk
Generation and control of two electron bunches to achieve desired drive and witness quality is crucial for plasma-wakefield acceleration (PWFA) experiments. One scheme to generate two electron beams with desired spacing is to apply two laser pulses with ps delay on the photocathode and co-accelerated two electron beams in the same RF bucket. Such a method is used in e.g. two-color FEL[1,2,3]...
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Oksana Chubenko (Northern Illinois University)27/07/2026, 14:10To be considered for Working Group talk
Most advanced electron beam applications, including particle colliders, X-ray free-electron lasers, and ultrafast electron diffraction and microscopy experiments, require beams with exceptionally high brightness. Electron sources must also exhibit long operational lifetime and robustness under the high electric fields and laser fluences characteristic of photoinjector environments. In the...
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Nicholas Sudar (SLAC)27/07/2026, 14:30To be considered for Working Group talk
The photon energy range of the LCLS-HE upgrade relies heavily on the achievable longitudinal beam brightness. The final peak current and correlated energy spread are both limited by the longitudinal phase space at the exit of the injector, non-linear compression, and collective effects. The initial charge distribution off the cathode effects all of these factors. However, determining an ideal...
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Edgar Anton Hartmann (Heinrich Heine University Düsseldorf)27/07/2026, 14:50To be considered for Working Group talk
The E31x program at SLAC FACET-II encompasses five distinct but complementary experiments: E-311 (Plasma Torch Injection), E-313 (Multibunch Dechirper), E-315 (Plasma Afterglow Attosecond Metrology), and E-316 (Icarus).These experiments represent a synergistic set of plasma wakefield acceleration (PWFA) experiments utilizing the unique combination of multi-kA electron bunches at 10 GeV and...
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Maximilian Lenz (University of California, Los Angeles)27/07/2026, 16:00To be considered for Working Group talk
We present recent progress on a terahertz streaking diagnostic for ultrashort relativistic electron bunches at the UCLA Pegasus Laboratory. Single-cycle (~30 µJ) THz pulses centered at 0.5 THz are coupled into metallic structures, where field strengths are enhanced to several hundred MV/m and boundary conditions are tailored to produce a strong longitudinal streaking gradient. An initially...
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Mr Peng Lv (Tsinghua University)27/07/2026, 16:20To be considered for Working Group talk
Terahertz (THz) streaking is a powerful technique for ultrafast longitudinal diagnosis of relativistic electron beams, as THz pulses generated via optical rectification are intrinsically synchronized to the driving laser and exhibit wavelengths well matched to the characteristic phase-space dimensions of relativistic electron bunches. However, the temporal resolution of THz streaking is often...
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Nicholas Matlis (Arizona State University)27/07/2026, 16:40To be considered for Working Group talk
Laser-plasma accelerators (LPAs) are highly promising drivers for compact X-ray free-electron lasers (XFELs). However, fully exploiting their ultrashort, high-current bunches requires mitigation of the percent-level energy chirp commonly present in LPA beams as well as diagnostics capable of resolving femtosecond temporal structure. Recent demonstrations using conventional radiofrequency (RF)...
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Gerard Lawler (Paul Scherrer Institute)27/07/2026, 17:00To be considered for Working Group talk
We present a combined experimental and simulation study of terahertz (THz) streaking as a compact and flexible tool for longitudinal diagnostics in electron accelerator environments. By using image-domain comparison metrics and other optimal transport techniques applied to streaked and un-streaked beam profiles, we improve the robustness of longitudinal bunch measurements in realistic...
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Elena Ros (University of Colorado at Boulder)27/07/2026, 17:20To be considered for Working Group talk
Non-destructive diagnostics able to resolve transverse offsets and longitudinal separation of ultra-relativistic, two-bunch electron beams are necessary for a variety of applications including the ion channel laser (ICL), a variety of plasma wakefield (PWFA) experiments, as well as other accelerator applications. We present an electro-optic sampling beam positioning monitor (EOS-BPM) design...
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Spencer Kelham (Northern Illinois University)27/07/2026, 17:40To be considered for Working Group talk
Tailoring the longitudinal current profile for relativistic electron beams is essential for improving the efficiency of beam-driven wakefield acceleration. While various methods exist, applications involving ultra-high-energy or extreme current require non-invasive diagnostics. Electro-Optic Sampling (EOS) has the potential to provide non-invasive, single-shot access to the current profile...
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Atharva Kulkarni (UCLA Particle Beam Physics Lab)28/07/2026, 13:30To be considered for Working Group talk
Non-destructive bunch characterization is essential across a wide range of accelerator applications. Precise measurement of bunch charge is critical for correlating sample response with delivered dose, while femtosecond-level time-of-arrival (TOA) precision is paramount for resolving transient structural dynamics in pump-probe experiments. Cavity-based beam monitors, which exploit wake field...
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Mr Ross Rudzinsky (The University of Texas at Austin)28/07/2026, 13:50To be considered for Working Group talk
Laser Wakefield Acceleration (LWFA) is a highly promising, compact acceleration scheme capable of generating energetic, ultra-short, femtosecond-scale electron bunches (e-bunches). However, the extreme spatial and temporal scales inherent to LWFA e-bunches make their non-destructive, single-shot characterization exceptionally challenging. This presentation provides a comprehensive overview of...
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Ze Ouyang (The University of Texas at Austin)28/07/2026, 14:10To be considered for Working Group talk
Electrons microbunch in laser wakefield accelerators [1,2], in downstream light sources [3], and in laser modulators [4]. Precisely measuring the 3D microbunched density of the electron bunches is vital for understanding wakefield dynamics and optimizing electron-driven radiation processes. Multi-spectral coherent transition radiation (CTR) imaging measurements [5] have decoded such 3D...
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Maxwell LaBerge28/07/2026, 14:30To be considered for Working Group talk
Plasma accelerators have delivered beams of sufficient quality to drive free electron lasers (FELs). However, greater resolution and, ultimately, control of the electron beam's six-dimensional phase space is needed to drive FELs consistently with sufficient gain at sub-micrometer wavelengths, as well as to address future challenges for laser wakefield accelerators (LWFAs), such as staging. In...
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Travis Nichols (UCLA)28/07/2026, 14:501To be considered for Working Group talk
Minimally-invasive single-shot beam diagnostics are essential for the next generation of high-brightness electron accelerators. We report on the ongoing development of an ionization-based beam profile monitor utilizing a supersonic nitrogen gas sheet target. Recent progress has focused extensively on characterizing the precise density profile of the gas target, which is critical for accurate...
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Sean OTool (Stanford)28/07/2026, 15:10To be considered for Working Group talk
Accurate characterization of 3D space-charge fields in ultrashort electron beams is crucial for next-generation accelerators. The complex, transient 3D space-charge and CSR fields that ultimately shape and limit high-brightness beams have yet to be directly measured, leaving critical dynamics unobserved. A compact diagnostic for the direct measurement of the field itself thus remains a key...
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Jack Phillips (University of California, Los Angeles)28/07/2026, 16:00To be considered for Working Group talk
A very broadband, beta spectrometer, capable of measuring electron energy ranging from 1MeV to 100MeV has been developed and installed for UCLA’s MITHRA facility for plasma wakefield experiments. This spectrometer employs sextupole-like fields to strongly bend electrons into a scintillating screen. Due to the large and complex geometry of the magnet, the magnetic fields are difficult to...
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Rafal Zgadzaj (University of Texas at Austin)28/07/2026, 16:20To be considered for Working Group talk
Laser-plasma accelerators (LPAs) of cm length, driven by petawatt lasers, now produce quasi-monoenergetic electron bunches of ~ 10 GeV in energy [1, 2]. New generations of experiments in emerging multi-PW facilities are expected to reach far greater energies, e.g., simulations show ~100GeV energy gain using 500J laser pulses in a single sub-meter stage[3, 4]. A new suite of diagnostics that...
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José Franco Altamirano (The University of Texas at Austin)28/07/2026, 16:40To be considered for Working Group talk
For the next generation of high-power lasers, like ZEUS and MTW-OPAL, electron energies from 10 GeV to 100 GeV are expected. Conventional magnet spectrometers will have a huge footprint in the laboratory at these energies to maintain resolution, compromising the compactness of by plasma-based accelerators. Because of this, new ways to measure multi-GeV electron spectra will need to be...
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David Garcia (UCLA)28/07/2026, 17:00To be considered for Working Group talk
The development of high brightness RF photoinjectors for advanced accelerator applications necessitates a precise understanding of the initial beam distribution and physical parameters of the electron source. Traditional analysis of the solenoid scan technique fits the measured transverse spot sizes of the electron beam with a simplified analytic model to characterize the phase space at the...
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Brian Naranjo (UCLA Dept. of Physics and Astronomy)28/07/2026, 17:20To be considered for Working Group talk
Higher-order magnets offer both advantages and challenges when applied to magnetic spectrometer design. We present an update for the CPT Compton spectrometer delivered to FACET-II and also initial results for the BPT 1-100 MeV single-shot electron spectrometer installed at UCLA's MITHRA lab. Both devices are based on a sextupole design which offers a broad energy range and horizontal focusing.
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Chris Armstrong (Central Laser Facility)28/07/2026, 17:40To be considered for Working Group talk
High-intensity laser–plasma interactions generate bright, energetic x-ray radiation via numerous mechanisms during the ultra-short lifetime of the interaction. X-ray radiation from these sources is both informative of the underlying processes and valued for secondary applications. Yet, absolute characterisation of this radiation remains a significant challenge owing to its variable brightness,...
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Alex DeSimone (Northern Illinois University)30/07/2026, 13:30To be considered for Working Group talk
We present a linear chirp control approach consisting of transverse deflecting cavities and negative-identity drift sections. While the beamline supports both positive and negative chirp manipulation, we focus on operation that drives the beam toward a large positive chirp for applications such as broadband radiation generation and Balakin-Novokhastky-Smirnov damping for structure wakefield...
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Prof. James Rosenzweig (UCLA Dept. of Physics and Astronomy)30/07/2026, 13:50To be considered for Working Group talk
In the past year, a UCLA-NIU-ANL-LANL-SLAC collaboration has begun a dedicated experimental program investigating a technique to produce microbunching and associated coherent radiation by manipulating electron beams using the emittance exchange (EEX) beamline at the Argonne Wakefield Accelerator (AWA). This type of scheme, while awaiting first tests of its efficacy, underpins the ambitious...
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Apurva Gaikwad (Stony Brook University)30/07/2026, 14:10To be considered for Working Group talk
Future linear collider concepts often use "flat beams" with high emittance asymmetry to reduce bremsstrahlung, together with extreme beam focusing to achieve high luminosities. Although plasma lenses provide superior focusing gradients, existing designs are limited by the current-carrying capacity of active capillary-based lenses or the cylindrical symmetry of underdense lenses. This symmetry...
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Haoran Xu (Los Alamos National Laboratory)30/07/2026, 14:30To be considered for Working Group talk
A radio-frequency quadrupole (RFQ) was designed at 201.25 MHz for accelerating a proton (H+) beam and negative hydrogen ion (H–) beams from 65 keV to 2.1 MeV, for the LANSCE Accelerator Modernization Project (LAMP). The RFQ operates with a wide range of beam currents, from sub-mA currents for beamline tuning to 55 mA when producing high-charge bunches. To support a variety of experimental...
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YUXUAN CAO (University of Texas at Austin)30/07/2026, 14:50To be considered for Working Group talk
Plasma-accelerated electrons often develop percent-level time-correlated energy spread (''chirp") because the longitudinal accelerating-field changes across the bunch. Existing approaches to dechirping typically require precise tailoring of the density profile of the plasma or the injected bunch, or the insertion of chirp-control devices downstream of the wake. Here, using particle-in-cell...
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Anna Kinderman30/07/2026, 15:10To be considered for Working Group talk
At FACET-II, laser heater (LH) optimization, encompassing power, alignment, and timing, is employed to suppress microbunching instabilities and customize longitudinal current profiles. Analogous techniques at LCLS have demonstrated that temporally shaped LH pulses can imprint programmable slice energy spreads that, after bunch compression, convert into controlled current modulations, enabling...
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Buse Naz Temizel Ozdemir (Northern Illinois University)30/07/2026, 16:00To be considered for Working Group talk
We present simulation results on the generation of sub-micron longitudinal beam modulations using an emittance exchange (EEX) beamline. An initial transverse modulation is produced with a transmission electron microscope (TEM) grid and mapped into the longitudinal plane through an asymmetric EEX configuration, where different dogleg bending angles are employed to reduce CSR-induced...
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Omkar Ramachandran (Argonne National Laboratory)30/07/2026, 16:20To be considered for Working Group talk
The accurate modeling and mitigation of coherent synchrotron radiation (CSR) represents an important challenge in the design of high-brightness beam transport systems. Widely used beam-dynamics codes typically employ a 1D line-charge approximation, reducing CSR to a longitudinal wake that is uniform across the bunch. While computationally efficient, this approach neglects transverse beam...
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Christopher Pierce (xLight Inc)30/07/2026, 16:40To be considered for Working Group talk
In many advanced accelerator applications, average power is limited by beam loss. The rate and location of losses due to Touschek scattering and residual gas scattering can be accurately computed with knowledge of the lattice. However, these calculations are expensive: involving Monte-Carlo methods where each of the millions of samples is tracked through the machine to the location of its...
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101. Status and Development of tailored phase space correlation generation using transverse wigglersGwanghui Ha30/07/2026, 17:00To be considered for Working Group talk
There is an ongoing project to develop a framework for recently proposed arbitrary correlation generation and to theoretically and experimentally explore its applications. Currently, a transverse wiggler-based approach is considered to be the main method for realizing tailored correlations. Current developments focus on the following items: limiting factors of the transverse wiggler, a method...
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Jinseo Park (SLAC National Accelerator Laboratory)30/07/2026, 17:20To be considered for Working Group talk
Accurate characterization of Longitudinal Phase Space (LPS) is critical for the optimization and operation of high-brightness electron beams at SLAC’s FACET-II facility. However, direct measurement of LPS typically relies on invasive diagnostics, such as the X-band Transverse Deflection Cavity (XTCAV), which cannot operate simultaneously with user experiments. To bridge this gap, we present a...
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Yingjie Dai (Tsinghua University)To be considered for Working Group talk
Storage ring-based steady-state microbunching (SSMB) is a promising approach for generating high-average-power coherent radiation, while the instabilities driven by coherent undulator radiation in the laser modulator (LM) is important for the ring performance. In this paper we investigate the longitudinal LM instability using cavity mode decomposition techniques to properly capture the...
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