Cryogenic Control System for the g-2 Muon Ring
The g-2 Muon storage ring consists of three superconducting solenoids 15 meters in diameter, and a beam Inflector solenoid 1.7 meters in length. All superconducting solenoids are indirectly cooled by forced two-phase helium. Cryogenic cooling is accomplished via a J-T circuit and a LHe control dewar. The control System for this cryogenic system is built around commercially available Programmable Logic Controllers (PLC’s) and cryogenic hardware for monitoring temperature, pressure and flow control. The complexity of this system necessitated the use of a graphical user interface (GUI) which permitted operators to perform monitoring and control functions from a central control room. The graphical interface allowed for rapid operator training and, with the cooling circuit schematic shown graphically they can respond to critical situations promptly. Critical data points on the experiment are logged in the software and historical trends are provided for. Using a software based system allowed for rapid system revisions as they were required. Flow control can be performed manually by the operator or automatically by the software based on linear control algorithms. The system has been in use for two years with successful results.
KeywordsCryogenic System Cryogenic Process Silicon Sensor Logic Software Resistance Temperature Sensor
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