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Daniel Matteo (RadiaBeam Technologies)Poster
Advanced particle accelerator facilities with ultrafast beams require high spatial and temporal resolution beam diagnostics to work at their full potential. Conventional non-destructive beam-position monitors (BPM) are not sufficient for ultrafast beams, as rapidly varying temporal beam characteristics (ps-scale or faster) are obscured by ns-scale detector response times.
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RadiaBeam... -
Gia Azcoitia (University of California, Los Angeles)Poster
Coherent transition radiation (CTR) provides a powerful link between the spa-
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tiotemporal structure of relativistic electron bunches and the electromagnetic
fields they emit, underpinning a wide range of beam diagnostics and radiation
sources. Despite its long standing theoretical foundation, existing frameworks
of CTR are historically restricted to simplified beam geometries. We... -
Dan Abell (IREAP, University of Maryland at College Park), Vincent Tembo (University of Maryland, College Park)Poster
Figures of Merit (FoMs) that characterize a beam’s properties. These properties—hence the FoMs—depend on the many adjustable parameters that describe a lattice, including the strengths, locations, and possible misalignments of focusing elements. Often, we require the gradient of the FoM with respect to each of the parameters. For systems that require numerical simulation, a naïve gradient...
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Omkar Ramachandran (Argonne National Laboratory)Poster
Determining the conditions under which reduced-order simulation models faithfully capture collective effects is a challenge in the beam dynamics modeling. The parameter spaces involved: beam energy, transverse and longitudinal emittance, current profiles, lattice elements and associated vacuum chamber geometry etc, often manifest themselves in highly nonlinear and unintuitive ways. While...
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Alexander Ody (Argonne National Laboratory)Poster
The Argonne Wakefield Accelerator (AWA) test facility has recently upgraded its in-house centralized control system to a modularized system using the EPICS control ecosystem, in a move to align with other large facilities and facilitate external collaboration to explore the implementation of machine learning techniques to beamline control and optimization. In particular, we aim to develop and...
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Lieselotte Obst-Huebl (Lawrence Berkeley National Laboratory)Poster
BeamNetUS is a collaborative user network of twelve beam test facilities spanning six U.S. Department of Energy national laboratories, dedicated to advancing particle accelerator research, technology development, and applications. Through an annual open call for proposals, BeamNetUS invites exploratory research aimed at seeding new collaborations and fostering innovation across the accelerator...
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YUXUAN CAO (University of Texas at Austin)Poster
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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Mr Ross Rudzinsky (The University of Texas at Austin)Poster
Radiation from undulating currents that charged-particle bunches induce when passing over a grating, known as Smith-Purcell radiation (SPR), becomes coherent for bunches shorter than the grating period. Millimeter-long bunches from radio-frequency accelerators generate coherent SPR only at mm-wave and low-THz frequencies. Here, we generate strong coherent 30-THz pulses by passing...
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Omkar Ramachandran (Argonne National Laboratory)Poster
The Linac Extension Area (LEA) at the Advanced Photon Source (APS) is a testbed, in the BeamNetUS network, capable of delivering high-brightness electron beams with sub-micrometer emittances and adjustable charge from 100 pC to 1.5 nC for advanced accelerator research and development. In this work, we present beam dynamics simulations and optimization of the photoinjected beam, including...
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Jesus Jimenez Zepeda (Particle Beam Physics Laboratory, UCLA)Poster
The MOTHRA laboratory at UCLA is developing a cryogenic C-band photoinjector for high-brightness electron beam generation and advanced cathode studies. The electron source is a novel 0.5-cell RF gun designed to operate at gradients up to 200 MV/m, where the combination of a high launch field, low intrinsic emittance cathodes, and cryogenic temperatures is expected to significantly increase the...
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Deeksha Sinha (Northern Illinois University)Poster
We present a multi-frequency kicker design based on the superposition of a fundamental frequency and its third harmonic. This multi-harmonic configuration can introduce additional flexibility in shaping the RF field profile across the central region of the bunch compared to a single-frequency kicker. As a result, it can be applied to applications that require tailored longitudinal and...
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Noa Nambu (University of California, Los Angeles)Poster
The propagation of intense, ultrashort laser pulses in gases is characterized by complex, highly nonlinear processes such as strong-field ionization and multiphoton excitation. Strong field ionization using UV (260 nm) light is of particular interest for new applications such as in-situ injection of spin-polarized electron beams in plasma-accelerators by ionization of Xe atoms. We have used...
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Claudio Emma (SLAC)Poster
Plasma-based compression of electron beams offers a compelling path forward towards attosecond duration bunches with up to mega-ampere peak currents. These beams are broadly of interest as drivers for attosecond light sources, strong field QED experiments, studies of ultrafast quantum dynamics and beyond. In this contribution we summarize recent experimental progress at FACET-II and at SPARC...
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Ou LabunPoster
Gaussian process and neural-network surrogates have improved laser-plasma accelerator (LPA) tuning, but they treat the accelerator as a black box: they can optimize beam metrics without revealing why performance drifts or which subsystem is responsible. This limits their utility for commissioning, fault prevention, and transfer across facilities. We present a fundamentally different approach:...
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Jeremy Rebenstock (University of Michigan)Poster
Measurements of energetic electron beams from 2 PW laser interactions with solid targets are presented. The experiments were conducted using the Zetawatt Equivalent Ultrashort pulsed laser System (ZEUS) at the University of Michigan with a very long focal length (f/70) focusing geometry and a peak intensity of about 10^19 W/cm^2. Very narrow divergence electron beams ( theta ~ 10 mrad) with...
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MAX VARVERAKIS (UCLA)Poster
Beam-driven plasma wakefield acceleration (PWFA) is a promising candidate for realizing a future linear collider, owing to the extremely high field gradients that are produced in plasmas. Despite recent success in high-gradient and high-efficiency electron PWFA, efficient positron PWFA remains a challenge. The warm plasma column regime offers stable, high-quality acceleration of positron beams...
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Eric Cropp (SLAC National Accelerator Laboratory)Poster
Precision control of electron beams is one of the main charges of beam physics, as producing high-brightness beams is critical to numerous accelerator deliverables including AAC applications. Critical to this effort is a set of accurate system models that can inform control policies. To be useful, these models must accurately reflect the behavior of the accelerator. In this work, a systematic,...
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Jack Phillips (University of California, Los Angeles)Poster
Transmission electron microscopy (TEM) grids have recently emerged as a powerful tool for single-shot 4D transverse emittance measurements on low-charge electron beams, with additional applications in generating microbunched beams through emittance exchange (EEX) for coherent radiation generation. However, their use has been largely confined to few-MeV beams, and the effects of bremsstrahlung...
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41. Optimizing Positron Converter and Particle Spectrometer Shielding Design Using FLUKA SimulationsIsabelle LaBelle (University of Rochester Laboratory for Laser Energetics)Poster
Recent experiments exploring positron generation using the electron beam from the OMEGA EP self-modulated laser wakefield acceleration (SMLWFA) platform struggle with insufficient positron signal relative to background using the existing particle spectrometer. To address this challenge, a new particle spectrometer is being designed with a larger aperture and specially designed magnetic optics...
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Deeksha Sinha (Northern Illinois University)Poster
Higher-order modes (HOMs), typically damped because they can induce beam instabilities in accelerators, can instead be exploited as an additional control mechanism to enhance ballistic bunch compression. In this work, we investigate the use of HOM fields to improve longitudinal phase space control in RF gun-based systems. Using particle tracking simulations, we characterize the dependence of...
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Rachel Margraf-O'Neal (Argonne National Laboratory)Poster
The Argonne Wakefield Accelerator (AWA) facility operates a high-charge (100s of nC) electron beam in a bunch train, with eight electron bunches at a 769 ps spacing matching the linac operating frequency of 1.3 GHz. AWA’s electron beam is optimized for producing large wakefields in resonant structures to study structure wakefield acceleration. This is achieved by maximizing total beam charge,...
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Andrew Long, Peter Bradshaw, Hitesh BindraPoster
Reliable operation of high-gradient superconducting RF (SRF) cavities in pulsed proton and electron linacs requires precise control of the intra-cavity electromagnetic field against three interacting perturbations: Lorentz force detuning (LFD), microphonics, and transient beam loading. Conventional Low-Level RF (LLRF) systems address these perturbations through feedforward tables and...
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HAO ZHANG (UCLA)Poster
Controlling the longitudinal phase space of high-brightness relativistic electron beams is crucial for advanced accelerator concepts. A key method for this involves manipulating the photoemission laser’s temporal distribution, though picosecond-level precision remains challenging*. In this work, we demonstrate that applying a controlled longitudinal ramp to a flattop laser distribution can...
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Pratik Manwani (University of California, Los Angeles)To be considered for Working Group talk
The MITHRA electron linear accelerator at UCLA is being developed as a platform for studying plasma wakefield acceleration (PWFA) and its relevance to near-planetary electron spectra. The facility can deliver electron beams with hundreds of picocoulombs of charge, sub-picosecond bunch lengths, low transverse emittance, and energies of 30 MeV, extendable to 80 MeV with the full linac...
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Thamine Dalichaouch (University of California Los Angeles)Poster
QPAD [1] is a unique particle-in-cell (PIC) code that combines the quasi-3D algorithm [2] and quasi-static (QS) approximation to efficiently model plasma-based accelerators (PBAs). The quasi-3D algorithm decomposes the electromagnetic fields and plasma source terms into azimuthal Fourier harmonics on a cylindrical grid, thus reducing the algorithmic complexity to that of a 2D code while still...
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Alec Tilton (Northern Illinois University)Poster
A collaboration is underway to investigate shielded CSR effects on a beam in a chicane-like compression environment. A beamline consisting of two identical doglegs with reversing quadrupoles in between—making two identical doglegs work as a c-type chicane—was installed at the Argonne Wakefield Accelerator. Individual vacuum chambers for dipole magnets are equipped with a shielding plate,...
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Erick Martinez (UT Austin)Poster
Smith-Purcell radiation (SPR) was discovered to be generated from a metallic grating when an electron beam passes close to the grating's surface. These electrons induce a charge on the surface of the grating, whose periodic motion generates a source of radiation with wavelength related to the viewing angle with respect to the grating. Furthermore, SPR becomes coherent (CSPR) along the viewing...
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Sam Quinn, ZITENG LIU (PBPL, UCLA)Poster
Advanced electron energy loss spectroscopy (EELS) requires energy precision on the meV scale to investigate low energy excitations in solid state samples. In conventional instruments, reaching this precision typically relies on passive filtering which leads to significant beam current loss. To address this, we report on the development of a compact 30 keV DC electron beamline that integrates...
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Osama Mohsen (Argonne National Laboratory)Poster
The Advanced Photon Source Upgrade (APS-U) relies on swap-out injection, which requires consistent delivery of high-charge bunches (up to 20 nC) from the injector chain, including the linac, Particle Accumulator Ring (PAR), and booster. At these charge levels, achieving sufficiently short bunch duration (<600 ps) becomes challenging, as compression with the 12th-harmonic cavity alone is not...
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Ze Ouyang (The University of Texas at Austin)Poster
Multi-spectral coherent optical transition radiation (CTR) imaging measurements have revealed the three-dimensional structure of microbunched electron beams produced by laser wakefield accelerators. However, accurate and unique reconstruction of the 3D structure requires prior knowledge of the longitudinal bunch profile, which is only accessible under certain conditions. A general approach for...
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Shiyi Wang (University of Maryland, College Park)Poster
Idealized physics models of charged-particle beam transport predict beam distribution second moments and envelopes, but not the detailed beam structure. We combine experiment and simulation to explore the interplay of space charge and angular momentum with realistic beam distributions in a low-energy transport system. Our realistic phase-space distributions derive from direct experimental...
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Daniel Franklin (Northern Illinois University)Poster
Photoemission for semiconductor photocathodes can be predicted by calculating required crystal parameters with ab initio Density Functional Theory (DFT) and using them to simulate photoexcitation, transport, and transmission of electrons into vacuum with a Monte Carlo model. This method allows detailed study of the fundamental mechanisms governing photoemission, such as stoichiometry and...
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Alex DeSimone (Northern Illinois University)Poster
A series of transverse wigglers can impart designed phase space correlations on a beam. In this scheme, individual transverse wigglers are characterized by three control parameters—phase, amplitude, and frequency—that determine its cosine modulation. Typically, 5-10 wigglers are required to shape a target correlation, and determining these parameters and tuning them during operation become...
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Monika Yadav (ODU)Poster
This work represents a preliminary step toward developing an AI-driven computational framework for accelerator science. The effort integrates accelerator physics, advanced computation, machine learning, and control to support future diagnostics, optimization, and operation. Initial activities focus on AI-enabled digital twins that combine physics-based models with machine learning, archived...
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Oksana Chubenko (Northern Illinois University)Poster
Alkali antimonide semiconductor photocathodes are widely used as electron sources for accelerator applications. The photocathode properties such as crystallinity, stoichiometry, and surface morphology fundamentally influence performance metrics like quantum efficiency (QE), thermal emittance, and response time. Recent studies demonstrate that the Pulsed Laser Deposition (PLD) technique can...
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Vincent Tembo (University of Maryland, College Park)Poster
Finding the steady-state phase-space distribution function for a large ensemble of interacting particles is challenging when studying systems with complex Hamiltonian or weakly dissipative dynamics, such as accelerator beams. These densities characterize long-term behavior of the ensemble and are critical for assessing stability, confinement, and matched beam transport. Direct methods rely on...
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Chenran Xu (Argonne National Laboratory)Poster
Precise measurement and reconstruction of the beam sigma matrix is essential for accurate transport line modeling and injection optimization at modern accelerators. We demonstrate that the differentiable simulation framework Cheetah enables end-to-end gradient-based reconstruction of the 5×5 transverse sigma matrix (excluding the time coordinate) at the Booster-to-Storage Ring (BTS) transport...
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230. Virtual shadowgrams of Thin Warm Hollow Plasma Channels for plasma-based positron acceleration.Timothy Araujo (University of Texas at Austin)Poster
Strongly nonlinear plasma wakefield accelerators (PWFAs) have achieved > 10 GeV energy gain along with important beam quality milestones for electron beams, but they defocus positron beams, resulting in comparatively low energy gain and beam quality. This asymmetry presents a long-standing challenge for plasma-based positron-electron colliders. Nonlinear PWFAs generated in cold pre-formed...
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