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22/11/2026, 09:30
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22/11/2026, 10:00
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22/11/2026, 11:00
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22/11/2026, 13:30
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22/11/2026, 15:30
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22/11/2026, 16:30
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Slawomir Alex Bogacz23/11/2026, 09:00
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23/11/2026, 10:30
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23/11/2026, 11:30
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Andreas Adelmann (Paul Scherrer Institut), Carl Jolly23/11/2026, 14:00
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24/11/2026, 09:00
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Lucas Brouwer (Lawrence Berkeley National Laboratory)24/11/2026, 11:30
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24/11/2026, 14:30
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24/11/2026, 17:30
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27/11/2026, 15:00
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Carl JollyContributed Talk
Fixed Field alternating gradient Accelerators (FFAs) are an attractive option for delivering high intensity hardon beams at future spallation neutron sources. Designing a high-intensity facility requires careful modelling of space-charge driven beam loss; not only at injection but later in the acceleration cycle if techniques such as beam stacking are employed.
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The beam dynamics in an FFA... -
Dr Adam Steinberg (The University of Melbourne)Invited Talk
The energy layer switching time is a limiting factor for all hadron therapy facilities, precluding fast beam delivery and reducing treatment efficacy. This bottleneck arises from the narrow momentum acceptance (around ±1%) of existing beamlines, requiring slow magnet ramping to adjust the beam energy. A delivery system with significantly larger momentum acceptance could remove this constraint,...
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Mamori Tanaka (Kyushu University)Contributed Talk
This study investigates the validity of the optics design methodology for a Vertical Fixed-Field Alternating gradient (VFFA) accelerator through beam transport experiments using a proof-of-principle electron ring. Beam transport characteristics were evaluated by comparing experimental results with particle-tracking simulations using three-dimensional magnetic field calculation data. The...
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Simon Barg (University of Melbourne)Invited Talk
From emittance-reduction in synchrotrons to beam delivery systems for particle therapy: a wide range of accelerator applications require achromatic beamlines, even though further constraints differ greatly between the use cases. We present a computational methodology based on multi-bend achromat and fixed field accelerator principles for the design and optimization of compact achromatic...
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Jian Wu (Institute of High Energy Physics, Chinese Academy of Sciences)Contributed Talk
The CSNS FFA project requires an RF system operating in the 2.598–3.163 MHz frequency range, providing an accelerating voltage of 300 kV/turn to accelerate the beam from 300 MeV to 600 MeV, with the bunch length compressed to approximately 5 ns. To meet the wideband and high-gradient requirements, a magnetic alloy (MA)-loaded cavity has been adopted. This contribution reports recent progress...
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Yan Cui (Institute of High Energy Physics)Contributed Talk
As a key facility for the China Spallation Neutron Source (CSNS) Phase-II upgrade, the newly proposed Fixed-Field Alternating Gradient (FFA) accelerator faces severe nonlinear beam dynamics challenges due to its large-aperture magnets. Simulation tests based on Opera-3D magnetic field maps indicate that the dynamic aperture (DA) of the initial field map is approximately 550...
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Jianliang Chen (IHEP, Chinese Academy of Sciences)Contributed Talk
The Fixed-Field Alternating-Gradient (FFA) accelerator achieves strong-focusing acceleration over a wide energy range with fixed magnetic fields. However, magnet field errors and alignment deviations persist over the full momentum range, causing cumulative beam quality degradation through energy-dependent closed orbits. This study focuses on the spiral-type FFA accelerator at the China...
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Taichi Kanda (Kyushu University)Contributed Talk
To realize high-yield production of astatine-211 (At-211) for targeted alpha therapy, an existing simulation code for the Energy Recovery Internal Target (ERIT) scheme employing a Fixed-Field Alternating Gradient (FFA) accelerator and an internal target was extended to evaluate At-211 production yields. The validity of the extended code was verified by comparing the emittance growth induced by...
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Carl JollyContributed Talk
The Fixed Field Alternating Gradient (FFA) accelerator is a natural candidate for a high-power pulsed proton driver, although no high-power FFA has yet been constructed. As a critical component of the accelerator, the main magnets are the subject of particular study. Operational flexibility, in terms of machine optics, over a large range is an essential feature of such a machine. In order to...
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Carl JollyContributed Talk
In recent times OPAL has been used to simulate FFAs with great success. Since 2025 the OPAL team has been preparing OPALX, a GPU-capable upgrade to OPAL with provision for 2.5D and 3D space charge solvers. As part of this effort, we have re-implemented the FFA magnet modelling capability to be capable of simulation on GPU. In this presentation I will describe the design of OPALX and show first...
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Liangsheng HUANG (Institute of High Energy Physics, Chinese Academy of Sciences)Contributed Talk
In high-intensity proton accelerators, beam impedance and the resulting instabilities constitute major limitations on achievable beam quality. This paper presents a review of beam impedance and of the characteristic instability phenomena in such machines.
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Mingyang Huang (Institute of High Energy Physics, Chinese Academy of Sciences)Invited Talk
The China Spallation Neutron Source (CSNS) is a high-power proton accelerator facility dedicated to neutron scattering research. In the second phase, CSNS-II, the injection energy will be raised from 80 MeV to 300 MeV, and the Linac repetition rate will double from 25 Hz to 50 Hz—with 25 Hz allocated to the RCS and the remaining 25 Hz reserved for other applications. Based on the CSNS-II...
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Jacinta YapInvited Talk
Clinical perspectives on emerging trends, requirements, advantages & challenges of FFA technologies for particle therapy
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Bangle Zhu (IHEP)Contributed Talk
The Fixed-Field Alternating Gradient (FFA) accelerator ring of the China Spallation Neutron Source (CSNS) requires a high-reliability vacuum system to ensure efficient beam transmission and long-term operational stability. This paper presents the preliminary design of the CSNS-FFA vacuum system, which is characterized by its large scale, with an average radius of 12 meters, making it the...
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Dr Adam Steinberg (The University of Melbourne)Contributed Talk
Plasma wakefield acceleration offers high field gradients, typically on the order of 10 to 100x larger than conventional RF cavities. Currently available proton beams have sufficient energy to maintain these wakefields over significant distances, allowing a witness bunch of leptons to be accelerated to the energy frontier, with the plasma acting to mediate energy transfer from the proton...
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Kai Zhou (Institute of High Energy Physics (IHEP), Chinese Academy of Sciences (CAS))Contributed Talk
PyFFA is a Python-based simulation code for beam-dynamics studies in scaling fixed-field alternating-gradient accelerators (FFAs). This work presents its space-charge simulation capability for high-intensity beams. To accommodate long, curved bunches and closed orbits that vary with beam energy, PyFFA dynamically reconstructs the reference coordinate system as the bunch evolves. This enables...
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Bin Wu (Institute of High Energy Physics, Chinese Academy of Sciences)Contributed Talk
A 300–600 MeV scaling fixed-field alternating gradient (FFA) ring is proposed as a multipurpose proton driver for the China Spallation Neutron Source (CSNS) Phase-II upgrade under strict engineering constraints ($R_0 = 12\text{ m}$, radial beam excursion $\Delta r \le 0.8\text{ m}$, and peak field $B \le 1.66\text{ T}$). To overcome these tight boundaries, a global statistical design framework...
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Yujiro Yonemura (Kyushu University)Invited Talk
At the Center for Accelerator and Beam Applied Science of Kyushu University, infrastructure for beam utilization of the FFA is being developed. The current status and recent progress of the FFA at Kyushu University are presented
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Lucas Brouwer (Lawrence Berkeley National Laboratory)Contributed Talk
We present the test of a superconducting accelerator magnet producing combined dipole and quadrupole fields in a 90 mm x 40 mm elliptic aperture. The 0.6 m long magnet consists of two Nb-Ti canted-cosine-theta (CCT) winding layers impregnated with paraffin wax and assembled into an iron yoke and aluminum shell-based structure. We share the quench training and field performance at 4.2 K,...
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Joel Bellesini (University of Melbourne)Contributed Talk
In charged particle therapy, high energy layer switching times prolong beam delivery time, limiting treatment efficiency. The TURBO (Technology for Ultra-Rapid Beam Operation) project aims to build a low-energy (0.5-3 MeV) demonstrator beamline for proton therapy with a large momentum acceptance (±42%), enabling rapid delivery over the full clinical energy range, alleviating this bottleneck....
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