[PEPPo] Proof-of-principle ,e,+, source for future colliders

[Jay Benesch]

https://journals.aps.org/prab/abstract/10.1103/PhysRevAccelBeams.27.013401

6 GeV electron beam and thick target.  I send this only because of the 
fragment starting at the bottom of page one:

as well as a novel standing wave solution for the rf cavities that 
provides a large iris aperture

which may be of interest.

The PSI Positron Production (P 3 or P-cubed) experiment is a e þ source 
and capture system with the
potential to increase by an order of magnitude the state-of-the-art e þ 
yield normalized to the drive linac
energy, a highly desirable goal for future colliders. The experiment is 
framed in the FCC-ee injector study
and will be hosted at SwissFEL, located at the Paul Scherrer Institute 
in Switzerland. This paper presents
the P 3 project at an advanced stage, with an emphasis on a capture 
system featuring a novel e þ matching
device based on high-temperature superconducting solenoids, followed by 
two large aperture rf cavities
surrounded by normal-conducting solenoids. The diagnostics design is 
also introduced, including monitors
of charge, energy spectrum, and bunch-by-bunch longitudinal profile 
simultaneously for secondary e þ and
e − . The last chapter of the text overviews the currently ongoing 
installation at SwissFEL, including the
beam transfer line, rf network, radiation protection, and other relevant 
activities toward the operation with
e þ in the coming years.