Supervision de l'écriture de données de l'expérience LHCb

Located on the French-Swiss border near Geneva, CERN is one of the world's biggest scientific laboratories in particles physics, home for both theoretical and experimental research. At CERN the world's most powerful particle collider was build and is now being commissioned, the Large Hadron Collider (LHC). The LHC, designed as a ring collider, is hosting several big physics experiments,including the Large Hadron Collider beauty experiment (LHCb). The LHC, together with the LHCb experiment are expected to go officially into operation in the middle of September 2008. It is precisely in this commissioning phase of the LHCb detector that my internship between April and September 2008 takes place. The aim of my project is to implement a monitoring system for the event data writing of physics data coming from the LHCb DAQ System. Event data writing is the last stage of the LHCb DAQ System and is a crucial part for the success of the experiment. It is a fully redundant distributed system composed of various tasks and services gathered around a dedicated database. Their purpose is to handle all actions involved with the file creation, writing, management and transport to the offline reprocessing system. From a technical point of view, the project relies upon the Python language, the DIM client-server inter process communication protocol (exposed as a the PyDIM library in the Python language) and the PVSS SCADA framework. The monitoring software I have built fulfils the project requirements and is now being integrated with the Experiment Control System (ECS) of the experiment, a SCADA system used to monitor and control the whole LHCb detector.