Speaker
Eliana Gianfelice-Wendt
(Fermilab)
Description
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.
Primary author
Eliana Gianfelice-Wendt
(Fermilab)
