Conveners
P: Flash Talks
- Adrian Oeftiger (University of Oxford)
P: Flash Talks
- Adrian Oeftiger (University of Oxford)
P: Poster Session
- Adrian Oeftiger (University of Oxford)
P: Poster Session
- Adrian Oeftiger (University of Oxford)
Description
Flash Talks and Poster Contributions
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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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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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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)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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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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