Positron beam production and capture in the ILC

par Yuri Batygin (SLAC)

lundi 26 mars 2007, 16:00 → 17:30 US/Central

Salle 101 (LAL)

Operation of the future International Linear Collider (ILC) with polarized electron and positron beams will significantly improve the precise measurements in new physics. Polarized positrons will be generated by the photoproduction method. In this scheme, a high-energy primary electron beam passes through a helical undulator and produces circularly polarized photons, which then impinge on a target and produce longitudinally polarized positrons. Positrons are captured by the collection system including an Adiabatic Matching Device, pre-accelerator, long beam transport line and 5 GeV booster linac. The collection system has been optimized to insure high positron capture into the 6-dimensional acceptance of the damping ring keeping the high value of beam polarization. Special emphasis is on the Linac-to-Ring beamline which performs spin rotation and energy compression of the positron beam before injection into the damping ring. Various parameters affecting the positron capture are analyzed.