[PEPPo] The P3 Experiment: A Positron Source Demonstrator for Future Lepton Colliders

[Jay Benesch]

https://arxiv.org/abs/2308.16803

The PSI Positron Production (P3 or P-cubed) experiment is a demonstrator for a e+ source and capture system with potential to improve the state-of-the-art e+ yield by an order of magnitude. The experiment is driven by the FCC-ee injector study and will be hosted in the SwissFEL facility at the Paul Scherrer Institute in Switzerland. This paper is an overview of the P3 design at an advanced stage, with a particular emphasis on a novel e+ capture system and its associated beam dynamics. Additionally, a concept for the experiment diagnostics is presented, as well as the key points of the ongoing installation works. 

The remarkable
e+ capture capabilities of P3 are enabled to great extent by the usage of high temperature superconducting
(HTS) solenoid around the target region, as well as a
novel standing wave solution for the RF cavities that
provides a large iris aperture to maximize e+ capture
(see Table II). In addition, a variety of beam diagnostics,
whose goal is to demonstrate such a e+ yield upgrade,
will detect simultaneously the captured e+e- time structure, and measure the bunch charge and energy spectrum
of e+ and e- streams separately