RST Digital Algorithm for Controlling the LHC Magnet Current

The LHC will require a very high precision (a few ppm) in the control of the current (13 kA) in the main superconducting magnets. To achieve this challenging performance, several developments are made at CERN in the domain of DC current transducers, analogue to digital conversion and digital control loops. This paper will focus on the presentation of a robust digital algorithm. Simulation and prototype (2.4 kA) results will be presented.