International Workshop on Future Linear Colliders 2026

Session

Beam dynamics; beam delivery systems, main linacs, damping rings

10 Nov 2026, 14:00

KEK

93. Cavity BPM data adquisition system development and test with beam at ATF

Juan Carlos Fernandez Ortega (IFIC - CSIC (UV))

Beam Dynamics

Oral presentation (onsite or remote - not decided)

A readout system based on analog down-conversion electronics and a synchronized local oscillator (LO) was developed and tested with a cavity beam position monitor (cBPM) installed at the end of the Accelerator Test Facility (ATF) linac at KEK, Japan. The cBPM operates with dipole- and monopole-mode resonances at 1.725 GHz and 1.25 GHz, respectively, requiring frequency down-conversion to an...

62. Design and Performance of a Two-IP Beam Delivery System for the LCF at CERN

Conrad Caliari (CERN)

Beam Dynamics

Oral presentation (onsite)

A Linear Collider Facility (LCF) at CERN has been proposed as a Higgs, electroweak and top factory based on the superconducting RF technology developed for the ILC, covering centre-of-mass energies from 90 to 380 GeV. We present a new design of the beam delivery system providing two interaction points. A key element is a shortened, high-performance final focus based on local chromaticity...

67. Design, Optimization, and Testing of a High-Resolution Re-Entrant Cavity BPM on ATF

Laura Karina Pedraza Motavita (IFIC (Universidad de Valencia - CSIC))

Beam Dynamics

Oral presentation (onsite or remote - not decided)

A high-resolution cavity beam position monitor (cBPM) has been designed and fabricated for future linear collider applications. The design utilizes a re-entrant cavity geometry, which was optimized through radio-frequency (RF) simulations using CST Studio Suite. Parametric studies of the cavity's key dimensions were conducted to maximize the normalized shunt impedance—enhancing position...

87. Evaluation of the fringe field effects on nanobeams at the ATF2 beamline using RF-Track

Takumi Seino (The university of Tokyo)

Beam Dynamics

Oral presentation (onsite)

Stable generation of a nanobeam is a crucial challenge for the realization of the International Linear Collider, and its demonstration is currently underway at the KEK Accelerator Test Facility. Since the beam is strongly focused at the ATF2 virtual IP, the beam size at the final focusing magnet become large, and it is expected to be significantly affected by nonlinear fields of the magnet....

123. Final Focus Systems for the Linear Collider Facility at CERN

Lewis Kennedy (University of Oxford (GB))

Beam Dynamics

Oral presentation (onsite)

The Linear Collider Facility (LCF) has been identified as a promising candidate for a future linear e+e− collider at CERN. The LCF would operate primarily at a centre-of-mass energy of 380 GeV using superconducting RF technology based on the International Linear Collider (ILC), providing access to both Higgs and top-quark physics, with intermediate stages at 90 and 250 GeV enabling precision...

109. Flight Simulator: A Platform for the Development and Deployment of Automated Advanced Beam Tuning and Model Reconstruction Procedures

Wiktoria Malek (CERN)

Beam Dynamics

Oral presentation

Next-generation electron–positron colliders, including FCC-ee, CLIC, and ILC, require exceptional beam stability and extremely small beam sizes to achieve their target luminosities. Meeting these requirements demands advanced beam-based alignment (BBA) techniques, supported by accurate simulations and experimental validation.

This work presents combined simulation and measurement studies...

98. HALHF Final-Focus Comparison: Local and Traditional Schemes

Vera Cilento (Université Paris-Saclay (FR))

Beam Dynamics

Oral presentation (remote)

We present a comparison of Local and Traditional Final-Focus System (FFS) schemes for the Hybrid Asymmetric Linear Higgs Factory (HALHF), considering Beam Delivery System (BDS) length, optical performance, chromatic correction and sensitivity to the incoming beam emittances. The Local scheme offers a more compact BDS. The Traditional scheme may, however, provide a more robust solution due to...

101. Improvement of the Positioning Precision of the Magnet Mover System at the ATF Final Focus Beamline

Toshihiro Okada (High Energy Acceleration Research organization(KEK))

Beam Dynamics

Oral presentation (onsite)

At the KEK ATF, beam diagnostics and control technologies are being developed to achieve a 37 nm vertical beam size and to demonstrate the final-focus scheme for the ILC. Precise positioning of sextupole magnets is essential for correcting beam optics in the Final Focus (FF) beamline and achieving the target beam size. Particle-tracking simulations have shown that the sextupole magnet movers...

80. KEK ATF/ATF2 STATUS AND RECENT INSTRUMENTATION UPGRADES

Alexander Aryshev (KEK)

Beam Dynamics

Oral presentation (onsite)

The Accelerator Test Facility (ATF) at KEK provides a unique environment for studying nanometer-scale beam generation, measurement, and stabilization technologies for future linear colliders such as the ILC. Its 1.28 GeV ATF2 beamline was constructed to reproduce the challenging final-focus conditions expected at a linear collider interaction point. The design goal is a vertical beam size of...

84. Machine-Learning-Based Estimation of Phase-Space Beam Parameters from Beam Monitor Profiles at the J-PARC LINAC

Kohta Hiratani (Sci. UTokyo)

Beam Dynamics

Poster (onsite only)

High-quality beam diagnostics and control are essential for achieving stable accelerator operation and high performance. In future electron–positron colliders, precise monitoring and optimization of beam parameters will be particularly important for achieving high luminosity. Machine learning offers a promising approach to fast beam diagnostics by extracting beam parameters directly from...

54. RF-Track: A Flexible Simulation Tool for Beam Dynamics in Future Linear Colliders

Andrea Latina (CERN)

Beam Dynamics

Oral presentation

RF-Track is a particle-tracking code developed at CERN for the simulation, design, and optimisation of particle accelerators. The code incorporates spin tracking and a broad range of single-particle and collective effects relevant to future linear colliders and their injector complexes. These include space-charge forces, short- and long-range wakefields, beam loading in standing- and...

55. Simulation Studies of Beam Orbit Correction at the KEK ATF toward Machine-Learning-Based Tuning

Haato Sasaki (University of Tokyo (JP))

Beam Dynamics

Oral presentation (onsite)

In this presentation, we report on beam orbit correction at the KEK Accelerator
Test Facility (ATF).
Using the particle tracking code RF-Track, we construct a simulation environment
for the ATF, obtain the response matrices
for the steering magnets and the magnet movers, and perform orbit correction.
We evaluate the correction performance under introduced magnet position errors
and...

97. STATUS FOR DEVELOPMENT OF THE NANOMETER BEAM TECHNOLOGY AT THE ACCELERATOR TEST FACILITY

Toshiyuki Okugi (KEK)

Beam Dynamics

Oral presentation (onsite)

The Accelerator Test Facility (ATF) at the High Energy Accelerator Research Organization (KEK) is developing the nanobeam technology necessary for International Linear Collider (ILC) based on the ATF International Collaboration. The ATF has a damping ring capable of generating low-emittance beams necessary for the ILC and the ATF2 beamline capable of focusing the low-emittance beams into the...

110. Wakefield studies on nanometer-scale beams at the KEK-ATF

Yuki Abe (SOKENDAI(KEK))

Beam Dynamics

Oral presentation (onsite)

Future electron–positron linear colliders require nanometer-scale beams at the interaction point. At such small beam sizes, even weak transverse wakefields generated by accelerator components can affect the beam orbit and beam size and therefore cannot be neglected. The KEK Accelerator Test Facility (ATF), which is dedicated to developing nanometer-beam technologies, provides a unique...