The Calibration of the PEPPo Polarimeter for Electrons and Positrons
- Hampton University, Hampton, VA (United States)
- Laboratoire de Physique Subatomique et Cosmologie, Grenoble (France)
The PEPPo (Polarized Electrons for Polarized Positrons) experiment at Jefferson Laboratory investigated the polarization transfer from longitudinally polarized electrons to longitudinally polarized positrons, with the aim of developing this technology for a low energy (~MeV) polarized positron source. Polarization of the positrons was measured by means of a Compton transmission polarimeter where incoming positrons transfer their polarization into circularly polarized photons that were subsequently analyzed by a thick polarized iron target. The measurement of the transmitted photon flux with respect to the orientation of the target polarization (+-) or the helicity (+-) of the incoming leptons provided the measurement of their polarization. Similar measurements with a known electron beam were also performed for calibration purposes. This presentation will describe the apparatus and calibrations performed at the injector at the Jefferson Laboratory to measure positron polarization in the momentum range 3.2-6.2 MeV/c, specifically to quantify the positron analyzing power from electron experimental data measured over a comparable momentum range.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1089407
- Report Number(s):
- JLAB-ACC-13-1726; DOE/OR/23177-3752; TRN: US1300311
- Resource Relation:
- Conference: IPAC 2013 (International Particle Accelerator Conference), Shanghai (China), 12-17 May 2013
- Country of Publication:
- United States
- Language:
- English
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