International Workshop on Future Linear Colliders 2026

Session

Electron/Positron Sources

11 Nov 2026, 16:30

KEK

94. Prototype Development of Key Components for a High-Intensity Positron Source

Mr Yu Morikawa (KEK)

11/11/2026, 16:30

1

Electron/Positron Sources

Oral presentation (onsite)

Development of a high-intensity positron source requires reliable components capable of operating under severe beam-loading, thermal, mechanical, and electromagnetic conditions. We are developing prototypes of three key components: a rotating positron production target, an accelerator structure for capturing and accelerating positrons, and a flux concentrator for providing a strong pulsed...

96. A seamless Blackbox optimization of ILC E-Driven Positron source

Yodai Sasaki

11/11/2026, 17:00

Electron/Positron Sources

Oral presentation (onsite)

Since the ILC (International Linear Collider) cannot reuse beams, it is necessary to generate a large number of particles. In Electron-driven positron sources, it is important to find efficient generation conditions because the target load becomes large. We simulated the process in which an electron beam is injected into a W-Re target, the generated positrons are captured and accelerated by...

89. Beam Simulation and Parameter Study of the Capture Linac for the ILC E-Driven Positron Source

Masafumi Fukuda (KEK: High energy accelerator research organization)

11/11/2026, 17:30

Oral presentation (onsite)

To achieve high luminosity in the International Linear Collider (ILC), we need a high-current multi-bunch beam. Maximizing the positron capture efficiency (yield) is a key challenge. Positrons go through capture and booster linacs before entering the damping ring. For good transport efficiency later, it is important not only to get many positrons, but also to make the bunch short during the...

79. Generation of Polarized Positron Beams for Ce+BAF

Andriy Ushakov (Jefferson Lab)

12/11/2026, 11:00

Electron/Positron Sources

Oral presentation (remote)

The generation of polarized positron beams for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is based on bremsstrahlung radiation and electron-positron pair production by a 90% longitudinally polarized electron beam in a rotating tungsten target. The required electron beam energy and target thickness for generating a 100 nA positron beam with 60% polarization and a...

125. Photocathodes, Polarization, and Beyond: Advances in Electron Source Development

Jyoti Biswas (Brookhaven National Laboratory)

12/11/2026, 11:30

Electron/Positron Sources

Oral presentation (remote)

GaAs based photocathodes play a crucial role as the primary source of polarized electron beams in various accelerator facilities, including CEBAF at Jefferson National Laboratory and the Electron Ion Collider (EIC) at Brookhaven National Laboratory in the USA. The electron pre-injector at the EIC requires a 1-2 nC bunch with at least 85% spin polarization from a superlattice GaAs photocathode,...

124. Recent advances in long-lifetime photoelectron sources at Jefferson Lab

Max Bruker (Jefferson Lab)

12/11/2026, 12:00

Electron/Positron Sources

Oral presentation (remote)

Highly spin-polarized electron beams for accelerators are almost universally generated by laser-driven, DC-biased photoelectron sources containing GaAs-based photocathodes. These sources are subject to damage mechanisms causing the gradual destruction of the photocathode surface at a rate at least proportional to the beam current, effectively limiting the achievable average current for a given...

49. FCC-ee positron source design at 3 GHz

Yuting WANG (IJCLab - IN2P3/CNRS)

12/11/2026, 14:00

Electron/Positron Sources

Oral presentation (onsite)

A high-performance positron source is essential for FCC-ee to provide the high-intensity, low-emittance beams required for rapid injection, especially in the Z-pole operation mode. In the FCC-ee Feasibility Study, the reference positron source is based on a 2.86 GeV electron drive beam impinging on a 15 mm tungsten target, followed by an HTS matching device and a 2 GHz travelling-wave RF...

13. Status of P3 Experiment

Simone Giroldi (PSI and EPFL)

12/11/2026, 14:30

Electron/Positron Sources

Oral presentation

The PSI Positron Production (P3, or P-cubed) experiment is a demonstrator of a positron source and capture system developed within the FCC-ee injector study. Installed at the SwissFEL facility of the Paul Scherrer Institute, the experiment aims to significantly increase the positron yield compared with the current state-of-the-art. The facility combines a conventional pair-production target...

126. Positron Source for HALHF and Future Collider Designs

Gudrid Moortgat-Pick

12/11/2026, 15:00

Electron/Positron Sources

Oral presentation (onsite)

The current polarized source for the HALHF design has been studied and synergies with positron sources for ILC, LC and CLIC will be discussed.

113. Results of Active Plasma Lens and Pulsed Solenoid Studies as Optical Matching Devices at the ILC Polarized Positron Source

Niclas Hamann (Uni Hamburg/DESY Hamburg)

12/11/2026, 16:00

Electron/Positron Sources

Oral presentation (onsite)

The polarized positron source of the International Linear Collider requires efficient optical matching of the highly divergent positron beam produced at the target.
The long ILC bunch train also places strong requirements on the stability and operation of the matching device.
This contribution will summarize studies of two alternative concepts: a pulsed solenoid and an active plasma...