Power consumption and electric infrastructures for OPERA Power

Power consumption and electric infrastructures for OPERA ü Power consumption in OPERA ü Infrastructures: switchboards, power distribution, UPS ü Magnet power supplies ü Time schedule for tenders ü Conclusions A. Fulgenzi, F. Grianti, M. Incurvati, C. Sanelli, F. Terranova

Power consumption in OPERA We were urged by LNGS director to present a detailed list of power consumption in OPERA to evaluate the overall LNGS power dissipation Loads: Electronic detectors + BMS: mainly resistive loads. Steady power peak power. Need very reliable power distribution infrastructures. Under UPS. 100 k. W ü ü BAM: not in Hall C and mainly under UPS. 70 k. W Magnet power supply. Baseline option: switching power supplies IGBT-based. Steady power peak power and 80 -90% 50 k. W ü

Detailed power consumption Electronic detectors: Target Tracker Precision tracker RPC BMS 19 k. W x 2 SM 18 k. W x 2 SM 12 k. W x 2 SM 18 k. W } (16 k. W x 2 SM) (15 k. W x 2 SM) (10 k. W x 2 SM) (15 k. W) BAM: 70 k. W work in progress. . . Magnets: 25 k. W x 2 SM See note of J. Marteau Total during data taking (BAM off): 116 k. W + 50 k. W = 166 k. W

Infrastructures: UPS The MACRO UPS ("Piller") is available for OPERA ü 250 k. VA about 200 k. W üLocated far from Hall C dedicated switchboard in Hall C OPERA Borexino Hall C Hall B MACRO UPS

Power consumption versus time Mid 2004: infrastructures ready for RPC tests and first magnetization Max. power consumption: magnets under mains

Infrastructures: switchboards Existing: to be used for BAM UPS ("Piller") OPERA dedicated

Infrastructures: switchboards Hall C (three phases + ground) UPS Mains SM 1 SM 2 70 (eldet) 70 10 (serv) 10 15 (BMS) 15 40 (magnet) 40 SM 1 SM 2 100 (magnet) 100 30 (serv) 30 10 (serv) 10 BAM uses existing infrastructure in Hall B: foresee plugs connected both to UPS and Mains to be fixed together with Salvatore

Magnet power supplies Main features: Imax = 1700 A ; Vmax= 20 V ; controller under UPS Baseline option: switching power supply (PS) based on IGBT Pros: Good efficiency (80 -90%) No need of condenser for rephasing after transient (ramp-up and ballistic measurements) Cons: More expensive (70 k. Euro per PS ? ) Noisy at low frequencies IGBT generally employed at higher voltages Backup option: linear PS Pros: cheaper (50 k. Euro per PS) no switching frequencies to be filtered Cons: poor efficiency (50%) (40 k. W x 2 SM) need rephasing condensers after transient high peak power consumption (64 k. W x 2 SM)

Magnet power supplies: location 0. 5 m Ma. PMTs 2 m Control room TT power RPC supply racks TT TT spectrometer hubs spectrometer Cable tray Magnet power supply Water-cooled (infrastructures)

Tendering Power supply: Specs: Ready by end of May Tender: Start in September 1 st PS @ LNGS before summer 2004 Switchboard in Hall C (under the responsibility of LNGS - A. Fulgenzi): Our request are fixed since April and sent to LNGS people Hopefully ready before April 2004 Switchboard in Hall B: no need for tendering but modification needed. To be discussed with LNGS and BAM people.

Conclusions üOPERA needs dedicated infrastructures in Hall C (two switchboards located at the entrance of the hall). Specs are now fixed and sent to LNGS services. üOther infrastructures can be recycled: • UPS from MACRO • Switchboards in Hall B for BAM üPower supplies specs are fixed and tendering is going to start