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Title: PEPPo: Using a Polarized Electron Beam to Produce Polarized Positrons

Polarized positron beams have been identified as either an essential or a significant ingredient for the experimental program of both the present and next generation of lepton accelerators (JLab, Super KEK B, ILC, CLIC). An experiment demonstrating a new method for producing polarized positrons has been performed at the Continuous Electron Beam Accelerator Facility at Jefferson Lab. The PEPPo (Polarized Electrons for Polarized Positrons) concept relies on the production of polarized e⁻/e⁺ pairs from the bremsstrahlung radiation of a longitudinally polarized electron beam interacting within a high-Z conversion target. PEPPo demonstrated the effective transfer of spin-polarization of an 8.2 MeV/c polarized (P~85%) electron beam to positrons produced in varying thickness tungsten production targets, and collected and measured in the range of 3.1 to 6.2 MeV/c. In comparison to other methods this technique reveals a new pathway for producing either high-energy or thermal polarized positron beams using a relatively low polarized electron beam energy (~10MeV) .This presentation will describe the PEPPo concept, the motivations of the experiment and high positron polarization achieved.
Authors:
 [1]
  1. Hampton Univ., Hampton, VA (United States); et al.
Publication Date:
OSTI Identifier:
1223465
Report Number(s):
JLAB-ACC--15-2016; DOE/OR/23177--3528
TRN: US1601436
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
PEPPo Collaboration
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; POLARIZED BEAMS; ELECTRON BEAMS; CEBAF ACCELERATOR; POSITRON BEAMS; MEV RANGE 01-10; TUNGSTEN; BREMSSTRAHLUNG; COMPARATIVE EVALUATIONS; SPIN ORIENTATION; Polarization transfer