The detector control system for the HMPID in the ALICE experiment at LHC

The DCS (Detector Control System) of the ALICE experiment at LHC aims to integrate, configure, and monitor all the participating sub-detectors. The HMPID (High Momentum Particle Identification Detector), based on a Ring Imaging Cherenkov, is one of the ALICE sub-detectors. Its control system (CS) has to ensure the detector configuration, standalone running mode for test and maintenance, and integration in the ALICE DCS. In order to design the HMPID CS, we present in this paper an approach based on the GRAFCET Model. First results from the application of the GRAFCET to the liquid circulation apparatus, an HMPID subsystem, are reported. The impact of the solutions for the HV-LV sub-systems on the CS is also presented.