Beam Dynamics in a Spectrometer for the Polarized Positron Production Experiment

Batygin, Yuri K.

Stanford Linear Accelerator Center

关键词: Production;    Spectrometers;    Accelerators,Accphy;    Photons;    Polarization;   

DOI  :  10.2172/881535
RP-ID  :  SLAC-PUB-11827
RP-ID  :  AC02-76SF00515
RP-ID  :  881535

美国|英语

来源: UNT Digital Library

【 摘 要 】

The proposed experiment E-166 at SLAC is designed to demonstrate the possibility of producing longitudinally polarized positrons from circularly polarized photons to be used in future Linear Collider. The experimental set-up utilizes a low emittance 50 GeV electron beam passing through a helical undulator in the Final Focus Test Beam line of the SLAC accelerator. Circularly polarized photons generated by the electron beam in the undulator hit a target and produce electron-positron pairs. The purpose of the post-target spectrometer is to select the positron beam and to deliver it to a polarimeter whilst keeping the positron beam polarization as high as possible. This paper analyzes positron transmission and polarization in the E-166 spectrometer experiment. The positron transmission has a maximum value of 7% for a positron beam energy of 5.5 MeV, while positron polarization is approximately 60%.