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29/09/2026, 17:00
Refreshments will be available. Poster contributions can be set up in the Fisher Room at the main workshop venue, the Denys Wilkinson Building.
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30/09/2026, 08:00
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Adrian Oeftiger (University of Oxford), Shinji Machida30/09/2026, 08:30
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Foteini Asvesta (CERN)30/09/2026, 08:45A-1. Performance Review of Space-Charge-Limited Facilities
Lead talk session A-1.
Beam performance achievements in the CERN accelerator complex in the LIU era:
The CERN injector complex underwent significant changes under the LHC Injectors Upgrade (LIU) project during Long Shutdown 2 (LS2). The primary goal of the LIU project was to prepare the complex for the High Luminosity LHC (HL-LHC) era, with a particular focus on extending the brightness...
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Pranab Saha (J-PARC/JAEA)30/09/2026, 09:05A-1. Performance Review of Space-Charge-Limited Facilities
The 3-GeV RCS (Rapid Cycling Synchrotron) of J-PARC accelerates 8.33E13 protons per pulse from 0.4 GeV to 3 GeV at a repetition rare of 25 Hz for 1 MW output beam power. We have already achieved stable operation at the designed 1 MW beam power by sufficiently minimizing the beam loss [1]. The residual beam loss is mostly caused by the unavoidable foil scattering beam loss, occurring around...
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Jiancheng Yang (Institute of Modern Physics, Chinese Academy of Sciences)30/09/2026, 09:20A-1. Performance Review of Space-Charge-Limited Facilities
The High Intensity heavy-ion Accelerator Facility (HIAF) is a next-generation accelerator complex designed to provide high-intensity heavy-ion beams for nuclear physics, atomic physics, high-energy-density matter, and related interdisciplinary research. Achieving the design beam intensity requires addressing a series of beam-dynamics and technical challenges, including high-current ion...
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Robert Ainsworth (Fermi National Accelerator Laboratory)30/09/2026, 09:35A-1. Performance Review of Space-Charge-Limited Facilities
The Fermilab Accelerator Complex currently delivers the world’s most powerful neutrino beam, powered by a 1 MW, 120 GeV proton beam from the Main Injector. The forthcoming PIP-II upgrade will increase beam delivery demands, requiring the Main Injector and Recycler to stack and accelerate roughly 50% more beam with only limited upgrades to the existing complex.
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This talk will review recent... -
Yaoshuo Yuan (IHEP/CSNS)30/09/2026, 09:50A-1. Performance Review of Space-Charge-Limited Facilities
The beam commissioning of the CSNS RCS began in 2017. Over the years, the CSNS RCS has achieved step-by-step progress, including successful beam accumulation, acceleration to 1.6 GeV, and a gradual increase of beam power from 10 kW to over 185 kW on target.
Currently, the upgrade project of the CSNS (CSNS-II) is ongoing. The primary goal of CSNS-II is to further increase beam power to 500...
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Foteini Asvesta (CERN)30/09/2026, 10:05
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Robert Williamson30/09/2026, 11:00
Lead talk session B-4.
This talk outlines the key challenges of high-intensity ring design through the lens of the design and operation of ISIS, that of high-intensity machines worldwide, and particularly the design of the MW class neutron source ISIS-II. ISIS is the high-intensity pulsed neutron and muon source at the Rutherford Appleton Laboratory in the UK. Operation centres on a rapid...
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Takaaki Yasui (KEK)30/09/2026, 11:20B-4. High-Intensity Ring Design
In designing high-intensity proton synchrotrons, discussions often focus on the magnitude of the tune shift, that is, the linear effects of space charge. This is because the strength of space charge is generally considered to be characterized by the magnitude of the tune shift. Consequently, space-charge mitigation has traditionally been almost synonymous with tune-shift mitigation. Typical...
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Austin Hoover (Oak Ridge National Laboratory)30/09/2026, 11:35B-4. High-Intensity Ring Design
This talk will describe planned experiments to validate theoretical and computational models of space charge effects in the SNS Accumulator Ring (AR). I will discuss the potential to leverage the world-leading bunch intensity (2.25e14), flexible energy range (800-1300 MeV), four-dimensional phase space painting, and longitudinal bunch compression in the AR to push the tune shift to large...
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Joshua Appleby (University of Oxford)30/09/2026, 11:50B-4. High-Intensity Ring Design
In the design of future accelerators that push the high intensity frontier, such as ISIS-II, an outstanding question remains on how the choice of bare tune affects the space charge limit. As the bare tunes reflect the transverse focusing of each plane, different accelerator types, with different focusing schemes, such as synchrotrons or fixed-field alternating gradient accelerators (FFA’s),...
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Robert Williamson30/09/2026, 12:05
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Giuliano Franchetti30/09/2026, 13:30C-1. Resonances and Space Charge
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Ingrid Mases Sole (CERN)30/09/2026, 13:50C-1. Resonances and Space Charge
Space charge effects in combination with betatron resonances limit the performance of high-brightness LHC beams in the CERN Super Proton Synchrotron (SPS). Here we report on experimental studies performed with single-bunch proton beams, monitoring transverse emittance evolution and particle losses while performing tune scans across the horizontal and vertical planes. Two significant resonances...
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Chris Warsop30/09/2026, 14:05C-1. Resonances and Space Charge
The half integer resonance is a potential cause of significant emittance growth, beam loss, and thus a possible performance limitation on high intensity hadron rings. Of key importance is the transverse redistribution of the beam with space charge, as it approaches resonance (in most cases from above). The behaviour is a combination of both coherent and incoherent effects whose relative...
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Susumu Igarashi (High Energy Accelerator Research Organization (KEK))30/09/2026, 14:20C-1. Resonances and Space Charge
Third order resonances of 3νx=64 and νx+2νy=64 have been corrected for the high intensity operation of the main ring (MR) of the Japan Proton Accelerator Research Complex (J-PARC). The cause of the third order resonances would be error magnetic fields of the sextupole components. The resonances are corrected using the trim coils of the sextupole magnets and the beam loss in the operation are...
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Sergey Seletskiy30/09/2026, 14:35C-1. Resonances and Space Charge
Electron cooling can be extended to highly relativistic energies by employing non-magnetized, RF-based electron coolers. An example of such a cooler is the Ring Electron Cooler (REC), which has been proposed to improve the average luminosity of the Electron Ion Collider at collision energy. The REC is a high-current electron storage ring operating at a relativistic gamma of 294, with beam...
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Giuliano Franchetti30/09/2026, 14:50
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Giulio Stancari (Fermilab / UChicago)30/09/2026, 15:45A-2. Space-Charge Measurement and Compensation Studies
Lead talk session A-2.
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Cristhian Gonzalez-Ortiz (Fermilab)30/09/2026, 16:05A-2. Space-Charge Measurement and Compensation Studies
The interplay between space charge and collective beam instabilities is a central challenge for high-intensity circular accelerators. Understanding how space charge influences instability thresholds and coherent motion is essential for future high-power accelerator facilities. We present new experimental studies of collective beam dynamics in the Fermilab Recycler Ring using the Waker system,...
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Dr Markus Kirk (GSI)30/09/2026, 16:20A-2. Space-Charge Measurement and Compensation Studies
A pulsed electron lens for space charge compensation is being developed at GSI to increase the achievable beam intensities in the synchrotrons SIS-18 and SIS-100 of the FAIR project where space charge constitutes a major performance constraint during the process of injection of a primary beam into the synchrotron. Studies based on numerical simulations for SIS-100 have shown that a few...
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Ms Jingtong Du (IHEP/CSNS)30/09/2026, 16:35Poster Contributions (and Flash Talks)
In high-intensity hadron accelerators, longitudinal space charge effects are non-negligible and can modify the beam spectrum, which can lead to Loss of Landau Damping(LLD). Based on the Hofmann-Pederson distribution model, we obtains the RF voltage amplitude for a matched beam in CSNS-RCS. With the above results, particle-in-cell(PIC) simulations are performed to study the influence of space...
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Alexander Liemen30/09/2026, 16:38Poster Contributions (and Flash Talks)
Space-charge effects can limit beam quality and accelerator performance in high-intensity and high-brightness machines. This contribution focuses on OPALX, the GPU-enabled successor framework to OPAL, as a scalable and performance-portable platform for modeling space-charge effects in conventional accelerators.
For beams with large energy spread, electrostatic space-charge solvers is no...
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Yun Luo (Brookhaven National Laboratory), Yun Luo (Brookhaven National Laboratory)30/09/2026, 16:41Poster Contributions (and Flash Talks)
The Electron-Ion Collider (EIC), to be built at Brookhaven National Laboratory will collide polarized high energy electron beams with polarized protons and light ions with maximum peak luminosity up to $1\times10^{34}$cm$^{-2}$s$^{-1}$ in center mass energy range of 20-140 GeV. Both strong-strong and weak-strong models are used for the beam-beam interaction simulation studies for the EIC....
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Jean-Baptiste Lagrange (Science and Technology Facilities Council)30/09/2026, 16:44Poster Contributions (and Flash Talks)
Fixed Field Alternating Gradient (FFA) accelerators show strong
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potential as high-power pulsed proton drivers, yet no high-intensity FFA
has been constructed to date. A key requirement for such machines is
operational flexibility across a wide range of machine optics, as these
must be adjusted to the beam intensity, leading to the design and
construction of a dedicated FFA prototype... -
Yinqi Ji (Institute of Modern Physics, Chinese Academy of Sciences)30/09/2026, 16:47Poster Contributions (and Flash Talks)
Dual-beam H⁺/H⁻ acceleration in a single linac boosts beam power and operational flexibility. However, downstream of the RFQ, the H⁺ and H⁻ phase space distributions cannot, in general, be simultaneously matched to the lattice. This inherent mismatch poses a severe challenge in the presence of strong space charge. We present a framework for dual-beam transport with inherent mismatch, using a...
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Shivam Kakkar (University of Tennessee, Knoxville)30/09/2026, 16:50Poster Contributions (and Flash Talks)
Intrabeam stripping (IBSt) is a critical beam-loss mechanism in high-intensity H- linacs and presents a significant limitation to increasing beam power. This work presents a computational framework to evaluate IBSt-induced beam losses along the Spallation Neutron Source (SNS) linac for arbitrary bunch distributions. The calculation is based on evaluating the IBSt loss integral using a...
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Prof. Chong Shik Park (Korea University)30/09/2026, 16:53Poster Contributions (and Flash Talks)
Accurate evaluation of space-charge effects and their parameter sensitivities is essential for the design and optimization of high-intensity accelerators. We present the construction of a differentiable self-consistent space-charge map by combining Differential Algebra (DA) with an FFT-based Poisson solver using a truncated Green’s function. In this approach, the charge density, electrostatic...
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Prof. Chong Shik Park (Korea University)30/09/2026, 16:56Poster Contributions (and Flash Talks)
We present a theoretical framework for calculating the time-dependent electromagnetic space-charge fields generated by an accelerating charged-particle bunch in a finite cylindrical radio-frequency cavity with a flat cathode and an axial aperture. The beam-induced scalar and vector potentials are formulated in the Lorenz gauge using retarded Green's functions and cylindrical eigenmode...
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Robert Simpson (University of Oxford)30/09/2026, 16:59
Indirect space charge (the electric field generated by the mirror currents induced in the conductive surroundings) can drive resonances in synchrotrons. However, modelling this effect has historically been computationally expensive.
This contribution presents 2d closed-form solutions for transverse indirect space charge from Gaussian beams in various conductive geometries.
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These formulas... -
Max Topp-Mugglestone30/09/2026, 17:02Poster Contributions (and Flash Talks)
Impedance-driven head-tail instabilities in circular colliders such as the Large Hadron Collider (LHC) are typically suppressed by the introduction of Landau damping induced with strong external nonlinearities. However, it has been shown that sufficiently strong direct space charge can also serve to mitigate these instabilities, with previous simulations [Oeftiger 2017] indicating that...
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Carl Jolly30/09/2026, 17:05Poster Contributions (and Flash Talks)
Fixed Field alternating gradient Accelerators (FFAs) are a promising technology for the proton driver of the next generation spallation neutron source, ISIS-II. The beam in an ISIS-II FFA will experience strong space-charge forces and studying their effects could be key to understanding the drivers of beam loss. The beam dynamics in an FFA are typically studied by integrating the equations of...
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Okuno Hiroki (RIKEN)01/10/2026, 08:30
Lead talk session B-1.
Designing next-generation high-intensity linacs requires a detailed understanding of collective beam physics and the technological constraints that limit reliable MW-class operation. As beam currents enter the strongly space-charge-dominated regime, emittance growth, halo formation, and beam loss become tightly coupled to injector dynamics, neutralization processes,...
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Jibong Hyun (QST)01/10/2026, 08:50B-1. High-Intensity Linacs
Longitudinal beam control using RF bunchers is widely employed in accelerators. However, the nonlinear RF fields in bunchers distort the longitudinal phase-space distribution, can lead to emittance growth. In this presentation, we report a self-linearization phenomenon observed for a 125 mA, 5 MeV deuteron beam in the Linear IFMIF Prototype Accelerator (LIPAc). In this mechanism, distortions...
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Abhishek Pathak (Fermi National Accelerator Laboratory)01/10/2026, 09:05B-1. High-Intensity Linacs
The PIP-II 800 MeV, CW-capable superconducting-RF H⁻ linac at Fermilab must deliver at least 1.2 MW to LBNF/DUNE while holding uncontrolled beam loss below the hands-on-maintenance limit of ~1 W/m, a challenge rooted in its deliberately non-equipartitioned, strongly space-charge-dynamics, where the transverse tune depression reaches η ≈ 0.65 in the HWR and SSR1 spoke sections and space charge...
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Dong-O Jeon (Institute for Basic Science)01/10/2026, 09:20B-1. High-Intensity Linacs
Parametric instabilities have been long known as a major space-charge halo mechanism and studied intensively. With realistic distributions, for the first time we confirm that high-order parametric instabilities other than the envelope instability are not manifested in actual linear accelerators. Moreover, the effect of the envelope instability is weaker for the realistic distributions than for...
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Okuno Hiroki (RIKEN)01/10/2026, 09:50
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Adrian Oeftiger (University of Oxford)01/10/2026, 10:45C-2. Instabilities and Space Charge
Lead talk of session C-1.
Space Charge: Friend or Foe of Transverse Coherent Stability?
Transverse coherent stability of bunches is a key factor in the performance of high-intensity accelerators. As the brightness frontier is pushed further, space charge plays an increasingly important -- and seemingly contradictory -- role, both modifying and driving collective instabilities as well as...
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Miltiadis Bozatzis (Goethe University Frankfurt (DE))01/10/2026, 11:05C-2. Instabilities and Space Charge
The CERN Proton Synchrotron (PS) accelerates proton and ion beams over such an energy range that the transition energy is crossed in normal operation. Recent studies, motivated by the growing demand for high‑intensity proton beams for fixed‑target experiments, have revealed potential operational limitations in this region. The observed dependence of beam losses and transverse mean‑position...
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Vadim Gubaidulin (Synchrotron SOLEIL)01/10/2026, 11:20C-2. Instabilities and Space Charge
Many synchrotron light sources are in the stage of an upgrade to new-generation accelerators. These upgrades typically aim to reduce the transverse emittances by one or two orders of magnitude. Horizontal and vertical beta-functions are also smaller to further reduce the beam size at source points. At the same time, the beam energy typically remains unchanged. In these conditions, effects...
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Vladimir Kornilov (GSI Helmholtzzentrum für Schwerionenforschung GmbH)01/10/2026, 11:35C-2. Instabilities and Space Charge
The use of octupole magnets for Landau damping of transverse instabilities in synchrotrons must be carefully balanced against requirements of the coherent and single-particle stability. The octupoles should provide sufficient damping to suppress the instabilities while fulfilling the dynamic aperture constrains. In beams with a space-charge dominated tune footprint, all these beam dynamics...
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David Posthuma de Boer01/10/2026, 11:50
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Adrian Oeftiger (University of Oxford)01/10/2026, 12:05
Discussion contributions:
- Elias Métral on "Bunched-beam transverse coherent direct space charge modes"
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Ingo Hofmann01/10/2026, 13:30
This view is, of course, inevitably a personal one, and I apologise for being incomplete, subjective, and overly focused on selected highlights in the area of linear accelerators.
In 1953, the MURA (Midwestern Universities Research Association) project was founded in the Chicago area. It is often seen as a pioneering effort in the field of synchrotrons and storage rings, including early...
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Austin Hoover, Nicholas Evans (Oak Ridge National Laboratory)01/10/2026, 14:00A-3. Injection, Painting, Beam Splitting and Equilibrium Distributions
Lead talk session A-3.
Phase space painting into non-planar modes for space charge mitigation:
Recent experiments at the Spallation Neutron Source have demonstrated a new technique referred to as 'Eigenpainting'. During charge exchange injection, phase space painting can be used to build the beam distribution in a ring by controlling the phase space coordinates throughout the injection...
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Guodong Shen (Institute of Modern Physics, Chinese Academy of Sciences)01/10/2026, 14:20A-3. Injection, Painting, Beam Splitting and Equilibrium Distributions
High Intensity Heavy-ion Accelerator Facility (HIAF) is a mega accelerator cluster under construction in China. It’s designed to provide high intensity primary and secondary heavy ion beams. To achieve the challenging intensity goal under space charge effect and dynamic vacuum effect, an injection accumulation factor of 56 and an uncontrolled beam loss must remain below 5% is demanded. A...
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Onur Gilanliogullari (Uppsala University)01/10/2026, 14:35A-3. Injection, Painting, Beam Splitting and Equilibrium Distributions
Angular-momentum-dominated beams with a circular cross-section are referred to as circular-mode beams. The strong coupling introduced by angular momentum dominance produces a large asymmetry between the eigenmode emittances, known as intrinsic flatness: the beam is round in real space yet effectively flat in eigenmode space. With proper optics design, both the angular momentum and the circular...
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Billy Kyle (ISIS, STFC, UKRI)01/10/2026, 14:50A-3. Injection, Painting, Beam Splitting and Equilibrium Distributions
The ISIS rapid-cycling synchrotron (RCS) delivers high-intensity 800 MeV proton beams to two target stations at a repetition rate of 50 Hz. This operating regime necessitates low beam losses to minimise hardware activation. Beam losses at ISIS primarily arise from three mechanisms: transverse injection losses from foil recirculation hits, trapping losses due to coasting beam injection, and...
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Massimo Giovannozzi (CERN)01/10/2026, 15:05A-3. Injection, Painting, Beam Splitting and Equilibrium Distributions
In this presentation, I will review the principles of multi-turn extraction, and I will present the key experimental evidence of space-charge effects for split beams. I will present initial attempts to interpret it, pointing out the current research in this domain also summarised in a poster at this workshop. Finally, I will review possible new applications of non-linear beam dynamics manipulations.
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Nicholas Evans (Oak Ridge National Laboratory), Shinji Machida01/10/2026, 15:20
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Yu Du (Institute of Modern Physics, Chinese academic of Sciences)01/10/2026, 16:15A-2. Space-Charge Measurement and Compensation Studies
Phase space tomography of intense beams is challenged by a self-consistency problem: space charge depends on the unknown distribution. We introduce a transport-free tomography framework that reconstructs high-dimensional phase space using single-optics, single-location measurement schemes, thereby eliminating the need to model space charge. We discuss measurement schemes that extract...
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Ippei Yamada (J-PARC Center, Japan Atomic Energy Agency)01/10/2026, 16:30A-2. Space-Charge Measurement and Compensation Studies
In low energy beam transport (LEBT), space charge neutralization/compensation (SCN) plays an important role in focusing a beam and keeping the emittance low for a high intensity hadron accelerator. At J-PARC LEBT, the gas pressure is in a range from 10$^{-1}$ to 10$^{-4}$ Pa with H$_2$ gas flowing out from the ion source, and sufficient SCN is considered to occur for a 50 mA, 50 keV, 500...
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Giulio Stancari (Fermilab / UChicago)01/10/2026, 16:45
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Francesco Orso Pancaldi (University of Bologna, INFN - Bologna)01/10/2026, 17:10Poster Contributions (and Flash Talks)
In recent years, adiabatic trapping into non-linear resonances has been used to split a charged beam into multiple beamlets for multi-turn extraction. This beam manipulation is the standard operational mode at the CERN Proton Synchrotron (PS) to deliver proton beams for the fixed-target programme at the Super Proton Synchrotron (SPS). These manipulations are sensitive to space-charge effects,...
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Kiersten Ruisard (Oak Ridge National Laboratory)02/10/2026, 08:30B-2. Benchmarking and Experiments
Lead talk session B-2.
Beam Dynamics in the SNS Linac and Beam Test Facility:
The SNS Linac is currently the highest-power superconducting linac. This talk will describe operational challenges of the SNS H- linac, with a focus on what we do and don't understand about beam dynamics. R&D projects aimed at improving our understanding will be discussed, with a focus on the Beam Test Facility...
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Dr Tony Wood (Oak Ridge National Laboratory)02/10/2026, 08:50B-2. Benchmarking and Experiments
Research at the SNS Beam Test Facility uses comprehensive phase space diagnostics to support benchmarking of our particle-in-cell linac model. The BTF transports 2.5 meV, 50 mA H- beams a distance of 13 meters, through a transport line that includes 9.5 FODO cells. This talk will report on current benchmarking results. Very good agreement for the 90% core of the matched beam is demonstrated....
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Nilanjan Banerjee (Fermi National Accelerator Laboratory)02/10/2026, 09:05B-2. Benchmarking and Experiments
We have begun 2.5 MeV proton operations at the Integrable Optics Test Accelerator (IOTA) in Fermilab to study beam dynamics with an incoherent tune shift approaching 0.5 in a zero‑wakefield environment. We present a detailed comparison of predicted dynamics in bare IOTA (dipoles and quadrupoles only) from several simulation codes, including ImpactX, Lifetrac, MAD-X, PyORBIT, and Xsuite. We...
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Haroon Rafique (STFC)02/10/2026, 09:20B-2. Benchmarking and Experiments
PyORBIT has recently been ported to Python 3 and migrated to a Meson-based build system. This creates both an opportunity and a practical challenge for compiling PyORBIT together with the PTC libraries, which enable realistic lattice tracking, including nonlinear machine effects, within multi-particle space-charge studies.
This contribution will discuss ongoing work and experience with...
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Yichao Jing (Brookhaven National Lab)02/10/2026, 09:35B-2. Benchmarking and Experiments
At the Electron Ion Collider's Hadron Injector, the Alternating Gradient Synchrotron (AGS), space charge effects at injection remain a key factor that limits the polarized proton beam quality. Minimizing the emittance growth is essential for delivering high luminosity and minimizing polarization loss during acceleration. In this paper, we present Xsuite simulations of beam dynamics during AGS...
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Kiersten Ruisard (Oak Ridge National Laboratory)02/10/2026, 09:50
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Ji Qiang02/10/2026, 10:45B-3. Space-Charge Modelling
Lead talk session B-3.
Space Charge modelling of long bunches and data-driven approaches:
In this presentation, we will discuss challenges in space-charge modeling to support the design of new space-charge limited particle accelerator facilities. We will then review recent advances in space-charge modeling, such as the use of data-driven approaches and efficient methods for long bunches....
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Andreas Adelmann (Paul Scherrer Institut)02/10/2026, 11:05B-3. Space-Charge Modelling
Predictive modelling of high-intensity hadron and lepton beams requires self-consistent, first-principles simulations that remain scalable on heterogeneous HPC systems. This contribution presents OPALX as a unified, performance-portable framework for space-charge modelling across a wide range of accelerator regimes.
OPALX combines grid-based and grid-less methods in one toolchain: PIC with...
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Helena Alamprese (Michigan State University - FRIB)02/10/2026, 11:20B-3. Space-Charge Modelling
As next-generation particle accelerators aim for unprecedented beam intensities, modeling collective effects—particularly space charge—has become a dominant challenge. In low-energy, high-intensity hadron colliders, space charge has been demonstrated to cause tune shifts, emittance growth, halo formation, and particle losses. Consequently, accurate modeling is essential for machine design and...
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Oliver Boine-Frankenheim (TU Darmstadt and GSI)02/10/2026, 11:35B-3. Space-Charge Modelling
In hadron synchrotrons coherent bunch modes and their loss of Landau damping thresholds are important to determine active feedback requirements and bunch intensity limits. At low or medium energies space charge is the dominant collective force acting on the longitudinal bunch distribution. Usually simple g-factor or impedance models are applied, assuming a transversely constant force and a...
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Chad Mitchell02/10/2026, 11:50B-3. Space-Charge Modelling
ImpactX represents the next generation of the particle-in-cell code IMPACT-Z, featuring s-based symplectic tracking with collective effects, C++ parallelism with GPU acceleration, mesh-refinement (MR), openPMD standardized data I/O and a Python interface suitable for coupling to AI/ML workflows. Space charge models include FFT-based Integrated Green Function Poisson solvers (2D, 2.5D, and 3D),...
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Ji Qiang02/10/2026, 12:05
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YOICHI SATO (KEK/J-PARC)02/10/2026, 13:30A-4. Beam Loss and Halo Dynamics
Lead talk session A-4.
High intensity beam operation of J-PARC main ring in fast extraction mode:
The J-PARC main ring in fast-extraction mode supplies a high-intensity proton beams, having world highest protons per pulse, for the T2K experimental program in the neutrino target. In JFY2025, we have provided 900-kW stable beams for user operation and demonstrated 1-MW operation...
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Mr Trent Thompson (University of Tennessee, Knoxville)02/10/2026, 13:50A-4. Beam Loss and Halo Dynamics
The goal of on-going research at the SNS Beam Test Facility is to improve modeling and understanding of halo formation in the early stages of the SNS linac. The experiment at the BTF includes two phase space measurement stations separated by 9.5 FODO cells. By controlling beam mismatch in the FODO section, we systematically explore the dependence of beam halo formation on the mismatch...
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Shouyan Xu02/10/2026, 14:05A-4. Beam Loss and Halo Dynamics
The design betatron tune of the Rapid Cycling Synchrotron (RCS) of China Spallation Neutron Source (CSNS) is (4.86, 4.80), which allows for incoherent tune shifts to avoid serious systematic betatron resonances. However, at the design tune, severe horizontal beam instability and vertical beam loss induced by half-integer resonance under space charge detuning were observed when the beam...
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ESMAEIL AHMADI (STFC)02/10/2026, 14:20A-4. Beam Loss and Halo Dynamics
Current studies at ISIS aim to improve the measurement, modelling, and control of ring beam dynamics, with the broader goal of optimising operational setup and benchmarking beam-loss predictions for ISIS and the proposed megawatt-class upgrade, ISIS-II. Beam loss in high-intensity synchrotrons can arise from the combined effects of non-linear resonances, machine non-linearities, and space...
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YOICHI SATO (KEK/J-PARC)02/10/2026, 14:35
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Elias Metral (CERN)02/10/2026, 15:30
Lead talk session C-3.
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Stephen Brooks (BNL)02/10/2026, 15:50C-3. New Concepts
A method has been developed to match large three-dimensional Coulomb crystals into existing accelerators. These crystals exist at the space charge limit and have close to zero emittance. Simulations show bunch temperatures below 0.03 Kelvin persisting for 5500 turns in the BNL Booster lattice with modified magnet settings. This optics solution exploits the 'vortex effect' first seen in...
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Erik Kvikne (University of Oslo (NO))02/10/2026, 16:05C-3. New Concepts
Space-charge effects in material-filled beam regions are relevant for ionization cooling in a future muon collider, where low-$Z$ absorbers are used to reduce the beam emittance. We extend the conventional cylindrical space-charge impedance formalism to the case of a beam region filled with a material of arbitrary electromagnetic properties and surrounded by a perfectly conducting boundary....
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Bernd Michael Stechuner (CERN)02/10/2026, 16:20C-3. New Concepts
Multi-TeV muon colliders are promising machines for precision studies of the Standard Model (SM) of particle physics and for probing potential physics beyond the SM. In the proposed muon production scheme, muons are generated from pion decays, resulting in beams with very large phase-space volumes that must be reduced through ionization cooling.
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During ionization cooling, muons reach the... -
Dr Ruihu Zhu (IMP)02/10/2026, 16:35C-3. New Concepts
Six-dimensional muon cooling is essential for reducing the beam emittance to the level required for a high-luminosity muon collider. To investigate possible collective effects in such high-brightness muon beams, a new space charge module has been implemented in G4beamline and recently improved for simulations of muon cooling channels. The module has been assessed through benchmark,...
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Elias Metral (CERN)02/10/2026, 16:50
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Shinji Machida03/10/2026, 08:40
08:40: Passport check for RAL entry. Meet in front of Oxford University Physics Department, Denys Wilkinson Building (DWB), Keble Road Oxford OX1 3RH.
09:00: Departure by coach.
09:30: Arrive at RAL, R80 CR16 and CR17 meeting room and short introduction of the tour.
10:00: Tour starts with group of 10 for each places separately.
12:30 Return to Oxford by coach.
13:30 Arrival at...
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Lucas ZAIDATPoster Contributions (and Flash Talks)
High-intensity hadron linear accelerators transporting a 1 A deuteron beam operate in regimes dominated by severe space-charge forces, where preserving beam emittance and suppressing halo formation represent critical design challenges. In fixed-geometry superconducting lattices, strong initial space-charge tune depression is accompanied by evolving phase advances along the acceleration path. A...
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Dr Jonathan Thompson (ISIS Neutron and Muon Source)Poster Contributions (and Flash Talks)
OPAL is an open-source, parallel particle accelerator simulation framework developed and maintained primarily by the Paul Scherrer Institute (PSI). It provides high-fidelity modelling of charged particle beams, including space-charge effects, beam dynamics, and interactions with accelerator components, and is widely used for the design and analysis of high-intensity accelerator systems. ...
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Shinji MachidaPoster Contributions (and Flash Talks)
Understanding and its mitigation of beam halo becomes more critical when the beam power goal increases. We study a fully coupled optics in a linear accelerator whether it has any advantage in terms of collective effects compared with a conventional decoupled optics such as FODO cell.
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Geng WANG (IMP)Poster Contributions (and Flash Talks)
The Spectrometer Ring (SRing) is an essential part of the High Intensity heavy-ion Accelerator Facility (HIAF). Multiple single-turn injections are employed to achieve higher beam intensity with the operation mode of beam stacking. The pulse beam extracted from the Booster Ring will be compressed to within 120 ns, with momentum dispersion of 5 per thousand. The rise/fall time of the power...
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David Kelliher (STFC), Haroon Rafique (STFC), Jean-Baptiste Lagrange (Science and Technology Facilities Council), Shinji Machida
Find more detailed information on the [workshop website][1]. Please bring your photo ID (passport) if you participate in the RAL tour.
Meet at the Denys Wilkinson Building entrance downstairs on the street level in Keble Road, Oxford OX1 3RH, to depart by shuttle bus at 9am:
[https://maps.app.goo.gl/Ved83VVuH72TeWaf6][2]
Return to Denys Wilkinson Building until around 14:00.
...
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David Kelliher (STFC)Poster Contributions (and Flash Talks)
As Fixed Field Accelerators (FFAs) are candidates for next-generation, high-intensity
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facilities like ISIS-II, characterizing their coherent transverse beam instabilities has become a high priority. Unlike conventional synchrotrons, where head-tail instabilities are managed by manipulating chromaticity, scaling FFAs operate under a strict zero-chromaticity design constraint. This paper... -
Oliver Betteridge (The university of Manchester)Poster Contributions (and Flash Talks)
Static linear focusing is a standard part of photoinjector emittance compensation. It can reduce slice-envelope mismatch, but it cannot in general make all slice envelopes evolve identically. We study this limitation using the envelope-slope ratio α = r′/r, where r is the slice envelope and r′ is its derivative along the beamline. We then explore the use of azimuthally modulated EM modes to...
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Sergei Sherstiuk (Technical University of Darmstadt)Poster Contributions (and Flash Talks)
Real-time characterization of the longitudinal phase-space distribution during beam transfer along the transfer channel into the SIS18 synchrotron (GSI Darmstadt, Germany) is essential for low-loss, high-intensity operation. The reconstruction problem is formulated as an optimization task: finding the phase-space distribution that best reproduces the observed beam profiles. Gradient-based...
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Chen Xiao (GSI)B-1. High-Intensity Linacs
Intense uncoupled beams are conventionally transported through periodic focusing lattices composed of linear optical elements that provide radial confinement against defocusing space-charge forces. In such systems, interplane coupling has traditionally been regarded as an undesirable perturbation. Recently, however, the concept of matched transport in periodic quadrupole focusing channels has...
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Yan ZhouPoster Contributions (and Flash Talks)
Collective beam instabilities are a key limiting factor for the intensity and quality of accelerator beams, arising from the interplay of impedance and space charge effects. We investigate the influence of bunch length and beam velocity on beam impedance in the presence of space charge effects, as well as methods for suppressing transverse single-bunch instabilities. It is found that the...
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Nikita Kuklev (Fermilab)Poster Contributions (and Flash Talks)
There is a growing interest in differentiable simulations that have fast execution time and yield additional gradient information. Most differentiable accelerator codes use a single autodiff engine or truncated power series algebra library and then add standard optics and particle tracking equations on top. While benefitting from ease of use and fast development, such approaches give up low...
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Tomonobu Itagaki (Institute of Science Tokyo)Poster Contributions (and Flash Talks)
In the low energy beam transport (LEBT) of intense ion beam linear accelerators such as LIPAc, beam behavior is significantly influenced by strong space charge forces, so that space charge compensation (SCC) effects[1] of background electron plasma trapped within the beam's potential has an important role. These background electrons are supplied through the ionization of residual gas by the...
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Li Rao (Institute of High Energy Physics, Chinese Academy of Sciences)Poster Contributions (and Flash Talks)
Coupled-bunch instabilities will occur with long-range wakefields. And it's an effective way to adjust the chromaticity to suppress transverse coupled-bunch instabilities. In this study, transverse coupled-bunch instabilities with space charge are analysed and simulated using PyHEADTAIL. Results reveal that with strong space charge, there is one mode that depends solely on the longitudinal...
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qingzhao zhang (Institude of Modern Pyhsics,Chinese Academy of Sciences)Poster Contributions (and Flash Talks)
The space charge effect is a major limitation for high-intensity beam operation, causing tune shift, tune spread, beam loss, and degradation of beam quality. Conventional mitigation methods, such as increasing injection energy or enlarging emittance, are difficult to apply to existing accelerator facilities. An electron lens provides an effective approach for space charge compensation by...
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Elias Metral (CERN)Poster Contributions (and Flash Talks)
Transverse bunched-beam coherent direct space-charge modes are usually discussed within the framework of the Air-Bag bunch in a Square potential well (ABS) model. However, a key limitation of this model is that it does not account for the radial modes that naturally arise in realistic longitudinal distribution functions. In fact, these transverse coherent direct space-charge modes were already...
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