[PEPPo] Radiation in oriented crystals: Innovative application to future positron sources

[Jay Benesch]

I've just skimmed this and it gave rise to an out-of-the-box idea: could 
this be placed in the BSY, creating the positrons there?  All energies 
to ~20 GeV would then be available.  ABC could all get positrons. 
Shielding would be a big issue and might preclude it.


https://arxiv.org/abs/2401.03886

Mattia Soldani, Fahad Alharthi, Laura Bandiera, Nicola Canale, Gianluca 
Cavoto, Iryna Chaikovska, Robert Chehab, Vincenzo Guidi, Viktar 
Haurylavets, Andrea Mazzolari, Riccardo Negrello, Gianfranco Paternò, 
Marco Romagnoni, Alexei Sytov, Victor Tikhomirov

It has been known since decades that the alignment of a beam of 
high-energy electrons with particular crystal directions involves a 
significant increase of bremsstrahlung radiation emission. This 
enhancement lies at the conceptual foundation of innovative positron 
source schemes for future lepton colliders. In particular, the so-called 
hybrid scheme makes use of a heavy-metal radiator in crystalline form, 
which is then followed by an amorphous metallic converter for positron 
generation from electrons by means of a two-step electromagnetic 
process. This work presents the most recent simulation results obtained 
on the development of a hybrid positron source for the FCC-ee from the 
standpoint of the features of both the crystalline radiator and the 
amorphous converter.

Subjects:	Accelerator Physics (physics.acc-ph); High Energy Physics - 
Experiment (hep-ex)