Abstract
To high precision measurement of Υ-meson masses with KEDR detector on VEPP-4M collider the beam energy calibration is needed. The project of laser polarimeter for beam energy measurement by resonance depolarization method is discussed. The polarization measurement is based on up-down asymmetry of Compton backscatterring of circular polarized photons on vertical polarized electrons. Scattered photons are registered by two-coordinate detector based on Gas Electron Multiplier. Expected effect is about 1.6 % with 10 σ confidence level.
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