ORBIT CORRECTION SYSTEM AT THE COLLECTOR RING

The CR is a dedicated ring for cooling of hot beams coming either from the antiproton separator or Super-FRS [1]. It is anticipated that the understanding and control of the beam orbits will be important for achieving low beam losses. We describe our plans for measuring and correcting the Closed Orbit Distortion (COD) of the CR. The COD of the CR, which is distorted due to magnet misalignments, can reduce the ring acceptance by factor of 2, if a special correction system is not applied. The system, which is developed for the CR should be periodically or manually invoked to correct the global closed orbit and used to adjust the orbit position at some point using local bump. The Beam Position Monitor (BPM) and corrector magnet, which are planned to be used at the CR, are described in this paper. The numerical calculations based on the Singular Value Decomposition (SVD) algorithm have been performed in order to define possible COD without and with applying of a planned correction system. The SVD method is used to obtain the corrector strength.