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TY - UNPB AU - Blondel, A.P. ED - Zhao, Ning ED - Poole, John ED - Schaa, Volker RW TI - Introduction – Beam Energy Calibration and Polarization J2 - Proc. of eeFACT2016, Daresbury, UK, October 24-27, 2016 C1 - Daresbury, UK T2 - ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e^+e^- Colliders T3 - 58 LA - english AB - Introduction to the session on beam polarization and energy calibration – physics goals: precision measurements of Z (100 keV) and W masses (300 keV) – expected challenges – baseline method uses resonant depolarization for the Z and W masses – physics processes such as e⁺e⁻ –> Z gamma fo the higher energy are adequate for the Higgs and top qoark masses – this requires 1) transverse polarization up to and including the W pair threshold. 2) regular depolarization using spectator bunches. 3) extrapolation from beam energy to center-of-mass energy – if the ring is too small, beam polarization may not be available at the W pair threshold and another method has to be investigated to provide adequate precision. PB - JACoW CP - Geneva, Switzerland ER -