26 Apr 2004RSWG G.Guaglio 2/4 LHC main systems Magnet protection Loss Duration <10ms >10s middle False dump generator Resistive magnets Lifetime RF BPM Access Timing Experiments Collimation Vacuum DCCT LBDS BEM BIS Cryogenics QPS BLMS 4-5 first line systems: average < 1E-7/h/4 = 2E-8/h ~20 beam permit systems: average < 1E-6/h/20 = 5E-8/h Power converters ? ?
26 Apr 2004RSWG G.Guaglio 3/4 Annual False Dumps SystemFalse Dumps/yMain causeFalse Dumps/y after actions BLMS?Power supplies~4 BIS LBDS … Work proposal
26 Apr 2004RSWG G.Guaglio 4/4 BLMS UPS situation 68 in the straight sections: MTBF 1E5? (3) 1080 in the arc: MTBF 1E9 (0.004) 24 in surface VME : MTBF 60,000 (2) Possibility to use non LHC standard VME rack configuration to improve the reliability: disable/check fans interlock, parallel configuration,…