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Positron transmission and polarization in E-166 spectrometer
Author(s) -
Yuri Batygin
Publication year - 2004
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/826865
Subject(s) - undulator , positron , physics , thermal emittance , spectrometer , polarization (electrochemistry) , photon , electron , cathode ray , optics , electron spectrometer , solenoid , nuclear physics , atomic physics , circular polarization , beam (structure) , chemistry , quantum mechanics , microstrip
The proposed experiment E-166 is designed to demonstrate the possibility of producing longitudinally polarized positrons from circularly polarized photons. It utilizes a low emittance 50 GeV electron beam passing through a helical undulator in the FFTB. Circularly polarized photons generated by the electron beam in undulator hit a target and produce electron-positron pairs. Spectrometer after positron production target includes a solenoid and bending magnets to deliver polarized positrons to a reconversion target. The results of the simulation indicate that positron transmission efficiency of 1-3% with beam polarization of 60-80% can be obtained in spectrometer.

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