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MNO – Maintenance aNd Operation unit

MNO – Maintenance aNd Operation unit. LHC experiment magnets – ALICE – ATLAS – CMS - LHCb Maintenance and operation of common systems; follow-up of MCP – Magnet Control Project MSS – Magnet Safety System (G. Olesen)

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MNO – Maintenance aNd Operation unit

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  1. MNO – Maintenance aNdOperation unit LHC experiment magnets – ALICE – ATLAS – CMS - LHCb Maintenance and operation of common systems; follow-up of MCP – Magnet Control Project • MSS – Magnet Safety System (G. Olesen) • Verifies vital parameters of magnets (Temperatures, quenches, voltages…) and machine status signals • Controls Slow Dump – Fast Dump of magnet energies (open breakers, power supply off, fire quench heaters, DSS control signals…) • MCS – Magnet Control System (S. Ravat) • Controls magnets (power converters, main breakers, tests…) via MSS • Operation interface – Remote access • PLC based; PVSS-UNICOS • MDS – Magnet Diagnostics System (S. Ravat, A. Kehrli) • Magnet parameter read-out and storage, data treatment - First alarms, post-analysis • Vacuum Control (X. Pons, N. Bourgeois) • ATLAS – large system (8 toroids – 2 end-caps); CMS – integrated with MCS • PLC based; PVSS-UNICOS • 4 Technicians • Organises maintenance, updates, operation, contacts • 3 Engineers • Local experts, operation, contacts, new projects • FSU – Field Support Unit • 4 persons (Engineers, technicians, electricians) • + Other projects... G. Olesen - PH-DT-DI 1/4

  2. MNO – Maintenance aNdOperation unit ATLAS Magnet Safety System G. Olesen - PH-DT-DI 2/4

  3. MNO – Maintenance aNdOperation unit Maintenance - Consolidation: • Maintenance of common systems • Maintenance of batteries for MSS and ATLAS Heater Energisation Circuit • Replacement of aging components (opto-couplers, battery cells, ventilators…) • Vacuum systems maintained • New systems implemented (new sensors, interlocks…) • Often during 3 day technical stop – Time limits - Planning • MDS currently being improved • Database architecture changed, speed improved, noise immunity to be improved • MCS reprogrammed regularly for new features • Filters, interlocks, control panels • New MSS project • Current project started +10 years ago • Components no longer available, MTBF considerations • Commercial system under consideration – Proposal to follow G. Olesen - PH-DT-DI 3/4

  4. MNO – Maintenance aNdOperation unit On-call service: Systems On-call Service – SOS • Multidiscipline (electrical, electronics, cryogenics, vacuum, magnets, water, PVSS, PLC’s…) • 4 PH-DT technicians + 2 DSS (Detector Safety System) technicians from LHCb and CMS • 1 person intervention – SLIMOS 2nd person • Constructive weekly meetings • Alarms and various problems discussed • Feed-back to experiments • Operational since April 2006 • 2009: 4 Alarms per week, 60 % outside working hours (remote interventions possible) • In principle only common systems: MCS, MSS, MDS, DSS, RCS, but… • Most alarms not related to common systems • Alarms solved or SOS directs to proper service • Other on-call service ask for assistance • Turning point of the magnet running • Short of 1 person (ATLAS) – Needs to be operational quickly • 5 persons strict minimum – 8 more flexible • Additional members of service called in for complicated alarms • CERN rules apply – 12 hrs/day, 57 hrs/week, 12 weeks/year G. Olesen - PH-DT-DI 4/4

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