UPGRADED CONTROL SYSTEM FOR LHC BEAM-BASED COLLIMATOR ALIGNMENT

In the Large Hadron Collider (LHC), over 100 movable collimators are connected to a three-tier control system which moves them to the required settings throughout the operational cycle from injection to collision energy. A dedicated control system was developed to align the collimators to the beam during machine commissioning periods and hence determine operational settings for the active run. During LongShutdown1, the controlsystem was upgraded to allow beam-based alignmentsto be performedusing embedded beam position monitors in 18 newly installed collimators as well as beam loss monitors. This paper presents the new collimation controls architecture for LHC Run II along with several modifications in the Java-based application layer.