[PEPPo] IPAC '15 Abstract

[adeyemi at jlab.org]

Dear All,
You will find below the draft abstract for the IPAC’15.The deadline for
submission is Wednesday,December 3.
Please send me your comments and suggestions as soon as possible.
Thanks
Leke

PEPPo: Using a Polarized Electron Beam to Produce Polarized Positrons

Adeleke Adeyemi, on behalf of the PEPPo Collaboration

Polarized positron beams are identified as either an essential or
significant ingredient for the experimental program at present or next
generation lepton accelerators (JLab, Super KEK B, ILC, CLIC). A
proof-of-principle experiment demonstrating a new method to produce
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
electron/positron pairs from the bremsstrahlung radiation of a
longitudinally polarized electron beam interacting within a high Z
conversion target. The experiment was performed at the injector of the
CEBAF accelerator at Jefferson Lab and 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 high energy or
thermal polarized positron beams that can be generated using a relatively
low electron beam energy (~MeV) and also taking advantage of
state-of-the-art polarized electron sources that supply high polarization
(>80%) and high average current (milliAmpere). This presentation will
describe the PEPPo concept, the motivations of the experiment and high
positron polarization achieved.