Spin rotation and energy compression in the ILC Linac-to-Ring positron beamline

The Linac-to-Ring (LTR) beamline for positron beam injection into the damping ring at an energy of 5 GeV is considered. The beamline performs spin rotation and energy compression of the positron beam extracted from the booster linac. The lattice includes four 90-deg phase-advance FODO cells with bending magnets placed between them, a solenoid and RF structure. Basic parameters and optimal configuration details are discussed. An analytical treatment of the beamline is performed.