טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentLifshitz Ronen
SubjectThe ATLAS Muon Detector and its Detector Control System
DepartmentDepartment of Physics
Supervisor Professor Shlomit Tarem


Abstract

ATLAS is a general-purpose experiment designed to fully exploit the LHC discovery potential. The interaction rate at the LHC implies a data accumulation rate that cannot be stored on a permanent storage system for offline analysis. However, the production rate of the more interesting processes is much smaller. There is an obvious need for a high-performance filtering system, a trigger system, which will lower the data accumulation rate while focusing on events of interest.

Muon detection is an excellent method for identifying interesting processes. Therefore, the ATLAS muon system is a vital part of the trigger system. The muon system consists of several types of detectors, divided into barrel and endcap regions. The muon system includes a sub-group of detectors, which are optimized for speed and dedicated to the muon trigger.

ATLAS consists of various types of subdetectors, each characterized by its own features and requirements. A control system is required to configure and monitor the operating parameters of all the components of the detector. ATLAS will not be accessible during runs, thus the only interface to the front-end components will be through the detector control system. Therefore, it is required to be flexible and robust. The ATLAS control system was chosen to be distributed over local on-detector nodes interconnected by a field-bus and controlled by a master control station. The local nodes will implement automatic monitor and control features, thus reducing the load on the field-bus and the master station.

The central ATLAS detector control development group supplies standard local control nodes. The muon trigger detectors and electronics require various additional features, which are not included in the standard nodes. Therefore, additional effort was necessary for the development of a control application for the muon trigger detectors. The special features and requirements of the muon endcap trigger detectors and the implementation of their control application are emphasized in this document.

The author of this document is responsible for the development of the TGC-DCS-dedicated software for the distributed control nodes. A great effort has been made to exploit them up to their limit, by means of advanced features such as communication interfaces, procedures automation, etc. This approach had a substantial effect on hardware design for the TGC-DCS and combined the hardware and software development into an integrated project.