Conveners
FCC-ee Energy Calibration & Polarisation
- Alain Blondel (Universite de Geneve (CH))
Guy Wilkinson
(University of Oxford (GB))
14/04/2016, 08:30
Accelerators
Oral
One of the principal accomplishments of the LEP programme was the precise measurement of the mass and width of the Z boson. This achievement required excellent understanding of the collision energy of the accelerator, which was obtained through instantaneous calibrations of the beam energy with the technique of resonant polarisation, and then the application of a model to transport these...
Eliana Gianfelice-Wendt
(Fermi National Accelerator Lab. (US))
14/04/2016, 08:50
Accelerators
Oral
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 benet the Z peak physics program.
The large time constant of self-polarization (Sokolov-Ternov eect) in such a large ring can be greatly reduced by inserting proper wigglers in...
Ivan Koop
(Budker Institute of Nuclear Physics (RU))
14/04/2016, 09:10
Accelerators
Oral
Polarized electron and positron beams are needed for precise energy calibration in storage rings of FCC-ee collider. Such beams will be produced in special low-energy damping rings using superconducting wigglers and Sokolov-Ternov self-polarization mechanism. Next step assumes acceleration of polarized bunches in sequence of synchrotrons up to 45 - 120 GeV. The solenoid type spin rotators will...
zhe duan
(institute of high energy physics, Chinese Academy of Sciences)
14/04/2016, 09:30
Accelerators
Oral
Transversely polarized e+/e- beams for precision energy calibration and
(possibly) longitudinally polarized colliding e+/e- beams are critical topics
for CEPC operation at lower energy ranges (Z pole and possibly WW threshold). A preliminary study of these aspects is presented in this paper, mostly based on extrapolation
of LEP experiences. In addition, some Monte Carlo simulation results...
