PROTOTYPING LHC ORBIT CONTROL

Orbit correction consists in varying the strengths of the corrector magnets to make the measured beam position match a predefined reference. In the two LHC rings, this involves around 1000 beam position monitors and over 500 orbit correctors in each plane. The orbit control loop of the LHC must be able to compensate orbit drifts at frequencies between 10 �2 and 1 Hz. In this paper we investigate correction schemes and control designs that could be used for the LHC.