A polarized positron source for CEBAF

TL;DR

This paper proposes a compact polarized positron source for CEBAF using a high-polarization electron beam and simulations to achieve ~60% positron polarization, outlining an experimental validation plan.

Contribution

It introduces a novel scheme for generating polarized positrons with high polarization and current, tailored for CEBAF, supported by detailed GEANT4 simulations.

Findings

Positron polarization ~60% achieved in simulations

Source suitable for CEBAF-like injector with nano-Ampere intensity

Experimental testing plan outlined

Abstract

A compact polarized positron source for Jefferson Lab is discussed. This scheme relies upon a high polarization (85%), high current (1 mA), low-energy (<100 MeV) electron beam to generate polarized positrons in a conversion target via polarized bremsstrahlung and pair creation. GEANT4 is used to simulate source distributions suitable for a CEBAF-like injector with positron polarization ~60% and nano-Ampere intensity. An experiment to test this scheme is outlined.