Speaker
Eliana Gianfelice
(Fermilab)
Description
The use of resonant depolarization has been suggested for precise beam
energy measurements in the FCC-ee for Z and WW physics at 90 and 160
GeV CM energy respectively. In addition longitudinal beam polarization
would benefit the Z peak physics program.
The large time constant of self-polarization (Sokolov-Ternov effect) in
such a large ring can be greatly reduced by inserting proper wigglers in
the machine lattice. The resulting large beam energy spread however may
destroy polarization in presence of unavoidable magnet misalignments. This
calls for precise machine alignment and careful orbit correction.
In this paper the possibility of self-polarization in the FCC-ee at 45 and
80 GeV beam energy in presence of wigglers is investigated. Simulations with
quadrupole misalignment and orbit correction are presented.
Primary author
Eliana Gianfelice
(Fermilab)
