Status report about the ILC undulator-based positron source is given including ongoing R&D issues (target, wheel, OMD, polarization issues). Options for an undulator-based positron source for CLIC and HALHF will also be discussed.
This work examines a helical undulator, which serves as a source of polarized positrons. The fundamentals of undulator radiation and the influence of the associated parameters are discussed. It analyzes how the polarization transfer from the photons of the undulator radiation to the resulting positrons occurs and how the degree of polarization can be influenced.
Furthermore, the simulation...
To meet the strict luminosity requirements of the baseline design of the International Linear Collider (ILC), its positron source must provide a sufficiently intense positron beam. In a first step, positrons are produced inside a conversion target, either by an electron beam in the electron-driven scheme or by synchrotron radiation in the undulator-driven scheme. The resulting positron beam...
A prototype pulsed solenoid has been developed, and the key concepts that distinguish our approach from conventional designs are presented. An alternative method for constraining the windings against longitudinal displacement is proposed. To enhance positron yield, the solenoid is designed to be positioned in close proximity to the target; accordingly, the first turn is oriented parallel to...
The development of cutting-edge technologies has spurred the exploration of a pulsed solenoid as an effective optical matching
device for future positron sources. A prototype has been manufactured,
and the magnetic field distribution will soon be characterized through dedicated measurements. On the base of this design,
a specialized simulation code enabling Bayesian optimization of a...
We propose a novel method for generating highly spin-polarized positron beams through nonlinear Breit-Wheeler processes during the interaction of an ultraintense laser pulse with an electron beam.
Status and progress of e-driven positron source for ILC in KEK will be reported.
Since the ILC cannot reuse beams, it is necessary to generate a large number of particles, 31 mC/sec. 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 RF, and then collected...
The CLIC injector complex as been revised significantly in the past year. New more optimised accelerating structures have been designed and integrated into the complex. The energy of the electron drive beam for positron production has been reduced to 2.86 GeV and sequence of the different linacs and damping rings has been rearranged for cost optimisation. The overall results is a lower power...
The high-luminosity circular collider FCC-ee will need a low-emittance positron beam with high enough intensity to shorten the injection time. In particular, operation at the Z-pole demands a positron bunch intensity of 2.14e10 particles at injection into the collider rings. The baseline design for positron production relies on a conventional source, where a 2.86 GeV electron beam impinges on...
A high-yield positron source is essential for FCC-ee, which requires low-emittance beams with sufficient intensity for rapid injection. At the Z-pole, positron bunches of 2.14×10¹⁰ particles (5 nC) are needed, with a safety margin corresponding to 12.8 nC at the damping ring (DR). The positron source employs 2.86 GeV electrons striking a 15 mm tungsten target, with capture provided by a...
The Super Tau-Charm Facility (STCF) is a next-generation electron-positron collider currently under development in China. To meet its high-luminosity requirement, a high-current positron source is essential. In order to enhance the positron yield, we have optimized the magnetic field configuration of the flux concentrator, redesigned the geometry of the target cone, and modified the short...
This contribution presents the system design and commissioning of the first Adiabatic Matching Device (AMD) magnet built and tested in-house at Paul Scherrer Institute (PSI) using Non-Insulated (NI) High Temperature Superconducting (HTS) technology for the PSI Positron Production (P3) Experiment.
The P3 project is the proposed proof of principle experiment for the FCC-ee planned to start in...
A baseline concept for a continuous wave (CW) polarized positron injector was developed for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab. This concept is based on the generation of CW longitudinally polarized positrons by a high-current, polarized electron beam (1 mA, 130-370 MeV, and 90% longitudinal polarization) that passes through a rotating, water-cooled,...
We provide updates on the Compact Positron Source Project at SLAC. The project aims to deliver low-emittance, slow positron beams that can be re-accelerated and compressed in time. Applications include Ultrafast Positron Diffraction and plasma wakefield acceleration of positron beams. We will describe our design efforts to reach record-level slow positron beam intensities with a RF capture and...
