Speaker
Description
Measurements of the Z mass and resonance width with high accuracy are some of the key physics outcomes expected from e+e- collisions at the Future Circular Collider (FCC). The precise energy calibration of the FCC beams required for such measurements can be achieved by resonant depolarization of transversely polarized beams. Due to the large bending radius of FCC, polarization build-up times for spontaneous polarization by the Sokolov-Ternov effect are extremely long, requiring asymmetric wigglers and complex injection schemes which impact the machine efficiency. Production and transmission of polarized beams through linac, transfer lines and the high energy booster (HEB) of the FCC injector chain have recently been identified as a promising alternative. An important ingredient of such a scheme is a good transmission of the polarization through the injection chain of FCC, and in particular through the HEB energy ramp that involves crossing a large number of depolarizing resonances. In this context first studies of the transmission of polarized beams through the HEB cycle will be presented.
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