[PEPPo] IPAC15 abstract

[Adeleke Adeyemi]

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.