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LHC Seminar
Experience with the String2 Cryogenics Instrumentation and Control System
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Europe/Zurich
AT Auditorium (CERN)
AT Auditorium
CERN
Description
The String2 is a full-size prototype of a regular cell of the LHC arc. It is composed of eight cryogenic magnets and a separate cryogenic distribution line; an electrical feed box houses the superconducting leads to power the magnets. About 700 cryogenic sensors and actuators are distributed along four Profibus-DP and three Profibus-PA field buses. The process automation has been handled by two controllers, running 126 Closed Control Loops.
For the third and final run this year, a large part of the Control System has been migrated into the UNICOS framework, comprising new programming methodology, PLC and man-machine interface. Furthermore, new radiation tolerant WorldFIP field bus and signal conditioners for temperature and pressure have been introduced, together with the EtherFIP interface between WorldFIP and the PLCs. A set of intelligent valve positioners have now their electronics and pneumatic actuator separated by 1km of cable.
I will report on the experience with four years of designing, installing, commissioning and maintaining the String2 Cryogenics Instrumentation and Control System, and the lessons learned for the LHC.
For the third and final run this year, a large part of the Control System has been migrated into the UNICOS framework, comprising new programming methodology, PLC and man-machine interface. Furthermore, new radiation tolerant WorldFIP field bus and signal conditioners for temperature and pressure have been introduced, together with the EtherFIP interface between WorldFIP and the PLCs. A set of intelligent valve positioners have now their electronics and pneumatic actuator separated by 1km of cable.
I will report on the experience with four years of designing, installing, commissioning and maintaining the String2 Cryogenics Instrumentation and Control System, and the lessons learned for the LHC.