9-14 September 2018
University of Ferrara
Europe/Rome timezone

Self-polarization in Storage Rings

12 Sep 2018, 11:30
Teatro Nuovo - Piazza Trento e Trieste, 52

Teatro Nuovo - Piazza Trento e Trieste, 52

Piazza Trento e Trieste, 52
Plenary Sessions (for INVITED PLENARY TALKS only!) Acceleration, Storage and Polarimetry of Polarized Beams Plenary


Eliana Gianfelice-Wendt (Fermilab)


The possibility of electrons becoming polarized in an uniform field was predicted in the early 60s by Loskutov, Korovina, Sokolov and Ternov (Sokolov-Ternov effect of radiative polarization). The very first observation of beam self-polarization followed in 1968 at ACO in Orsay and confirmed at Novosibirsk VEPP-2 in 1970. However in particular at high energy, e+-- polarization is not really for free and in addition experiments are mainly interested on longitudinal polarization. This is obtained through spin rotators which may lead to depolarization. The p/e+-- high energy collider HERA in Hamburg was the first, and until now the only one, designed for delivering longitudinal e+-- polarization to the experiments. In my talk I will give an overview of the theory behind radiative polarization in high energy storage rings and I will describe the tools needed for fostering high polarization in practice. Results from beam polarization observations, mainly at HERA, will be presented. This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

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