Coordination of Hardware Commissioning Sector 78 Cryogenics Electrical Quality Assurance Warm magnet tests Last cabling campaign Final installation, repair, maintenance actions Test of software for the powering procedures Sector 81 Injection system tests RR57 – Sector 56 finished UA67 – Sector 67 Progressing as planned 24h run programmed for February 5th RR73 – Sector 67 in preparation Short Circuit Tests Point 8 Cool down of sectors 45 & 81 Powering Tests in Sector 78 Preparation

Warm magnet tests around Point 8 Injection Line & Septa RBIAH.87833 RCIBV.87904 RCIBV.88104 RCIBV.88115 RCIBV.88117 RCIBH.88004 RQID.87900 RQID.88100 RQIF.87800 RQIF.88000 MSIB8813M RBXWSH.L8 RBXWSH.R8 RBXWH.L8 Magnet Interlock Test Electrical QA PC Interlock Test PC Individual System Tests 8-h Run (includes Polarity + Thermomeasures) 24h Run LHCb compensators next week

Kicker system conditioning The automatic conditioning system required two weeks to become robust enough to operate unattended during the nights (Interlocks from magnets and from vacuum) It now operates day and nights and stops once per day. It is restarted by an operator during working hours. The conditioning started at 20kV and should reach 57kV (nominal+5,5%). Today we have reached 43kV: we are very satisfied even if the most difficult part (43->57kV) remains to be done ! Unfortunately the conditioning must be interrupted next week to allow cabling activities in the area. Courtesy L.Ducimetière

Coordination of Hardware Commissioning Experience from Sector 78 Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance « … corriger ce qui n’a pas été réalisé correctement. »

Coordination of Hardware Commissioning Experience from Sector 78 @8h30

Coordination of Hardware Commissioning

Cabling non-conformities …what slowed us down Cabling non-conformities Malfaçons Damage during installation Positioning of DC cables connections on the DFBs Preparation of the Current Leads Insulation vacuum Heating system Cameras Galvanic insulation Cryo instrumentation Control of valves In-rush current limitation to instrumentation crates Cryo controls 4 mm2 1.5 mm2 2.5 mm2 crimped Crates under the dipoles in the tunnel Burndy Harting Europrises Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

Cabling non-conformities …what slowed us down Cabling non-conformities Malfaçons Damage during installation Positioning of DC cables connections on the DFBs Preparation of the Current Leads Insulation vacuum Heating system Cameras Galvanic insulation Cryo instrumentation Control of valves In-rush current limitation to instrumentation crates Cryo controls Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

Cabling non-conformities …what slowed us down Cabling non-conformities Malfaçons Damage during installation Positioning of DC cables connections on the DFBs Preparation of the Current Leads Insulation vacuum Heating system Cameras Galvanic insulation Cryo instrumentation Control of valves In-rush current limitation to instrumentation crates Cryo controls Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

… with a little bit of help from our friends Cabling non-conformities Malfaçons Damage during installation Positioning of DC cables connections on the DFBs Preparation of the Current Leads Insulation vacuum Heating system Cameras Galvanic insulation Cryo instrumentation Control of valves In-rush current limitation to instrumentation crates Cryo controls Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

Cabling non-conformities …what kept us busy Cabling non-conformities Malfaçons (AC, DC, instrumentation) Damage during installation Positioning of DC cables connections on the DFBs Preparation of the Current Leads Insulation vacuum Heating system Cameras Galvanic insulation Cryo instrumentation Control of valves In-rush current limitation to instrumentation crates Cryo controls Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

…what could be improved Cabling non-conformities Malfaçons Damage during installation Positioning of DC cables connections on the DFBs Preparation of the Current Leads Insulation vacuum Heating system Cameras Galvanic insulation Cryo instrumentation Control of valves In-rush current limitation to instrumentation crates Cryo controls Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

LHC sector 7-8 Cool-down status end Jan’07 S. Claudet, on behalf of the LHC Cryogenics OP team and « Cryogenic Performance Panel » Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

Concerned sub-systems Upper Cold Box Warm Compressor Station Lower Magnet Cryostats, DFB, ACS Cold box Shaft Surface Cavern Tunnel LHC Sector (3.3 km) 1.8 K Refrigeration Unit New 4.5 K Refrigerator Existing Point 8 Point 1.8 Point 7 MP Storage Interconnection Box Distribution Line

Tuning - cryo commissioning Cool-down milestones Wk. 2 Wk. 3 Wk. 4 Wk. 5 Jan 2007 Flushing Tunnel equip. ELQA/control Cooldown 300 – 80 K Cooldown 300 – 80 K EL -control Cooldown 80 – 4.5 K EL -control Close to 3 weeks envisaged the 1st time (absolute mini: 10 days) 80K tests early february: ELQA, new PLC upload, test of quench line to P7 Feb 2007 Wk. 11 Wk. 7 Wk. 8 Wk. 9 Wk. 10 Tuning - cryo commissioning 4.5 – 1.9 K Preparation for Powering 1.9 K Ready For powering Wk. 6 Filling and Cooldown Mar Wk. 12 Wk. 13 Cooldown 80 – 4.5 K Mini: 2 d Mini: 1 d

QRL flushing - Dec’06 Mostly: - Kapton (Vent after P Test) - Dust

Flushing machine Wk 2 Jan’07 Before After Kapton bits Metal strips ≈ 50 h + 8 L of Water

Average capacity: (up to Jan 31st) Total: 43 % -wk-ends: 52 % - stops 67 % a) Start cooldown tunnel without magnet f) Unscheduled electrical stop & tunnel intervention cheduled electrical stop & tunnel intervention g) Reduced cooling capacity for magnet checking c) Control system stop for updates h) Reduced capacity d) Cooling adjustments in shields and magnets e) Snow on roads for liquid nitrogen trucks

Summary 1st week (wk. 3 Jan’07) Restricted access, PLC update Progressive ramp-up of cooling capacity Check of configuration Manual control of the arc Unbalanced cool-down of cells Possible cooling of DFB’s Cryoplant PLC « on hold »

Summary 2nd week (wk. 4 Jan’07) Stop to reset PLC Minimised effect of snow on roads 400 kV failure ELQA (21L8) Increased capacity Manual re-balancing of cool-down

Summary 3rd week (wk. 5 Jan’07) Cont’ increased capacity Supply temperature decreased to 80 K AUG P8 surface (Random, Cryo?) What’s next ?!?

n Snow on roads for liquid nitrogen trucks j Start cooldown tunnel without magnet o Unscheduled electrical stop & tunnel intervention k Scheduled electrical stop & tunnel intervention  Reduced cooling capacity for magnet checking Control system stop for updates  Reduced cooling along week-end with only on-call activity m Cooling adjustments in shields and magnets  Random Emergency Stop in cryogenic surface building n Snow on roads for liquid nitrogen trucks

Electrical Quality Assurance Findings During The Hardware Commissioning Phase in Sector 7-8 D. Bozzini on behalf of the ELQA team AT/MEL-EM 2 February 2007 Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

MQF.A78 circuit: A successful test 

MB.A78 circuit: Short to ground  NC 809943

MB.A78 Diagnostic: Precise location (1/10 meter) Local injection (between QQBI.20R7 and QBBI.A21R7 of a current 6 A through the I_Taps of the diodes V2 = VEE213 - Vf ≈ - 0.476 mV V3 = VEE111 - Vf ≈ 13.61 mV V1 = VEE111 - VEE213 ≈ 14.86 mV The developed length of bus-bar between the V-taps EE111 and EE213 has been computed based on specification drawings and is about 40830 mm V1 gives the voltage drop per unit of bus-bar length: 3.64.10-4 mV/mm (@ NTP) The distance of the fault Lf from v-tap EE213 is about 1300 mm (+/- 200mm)

MB.A78 Diagnostic: Confirmation by endoscopy On the left side of the interconnection QBBI.A21R7, at around 1.3 m there is a dipole magnet and the bus bar lyra. Fault localization Fault localization based on less-accurate measurements (low current, diode connections) Courtesy F. Savary AT/MCS Assembly Leak test Cool down Pressure Test Preparation for c-down Powering Electrical Quality Assurance

Overview: Online monitoring during cool down

MQD.A78: History of events

MQD local diagnostic 15.38 m (38.98-7.14) x 0.289 = 9.21 mV Accuracy: +/- 10 m

8h30 meeting … in summary Remember, it was the first one ! We had a terrific response from the teams involved in the activity to straighten things up Team building exercise Cryo Operation Electrical Quality Assurance Current Leads Magnet builders & interconnects Cabling (DC & Controls, AC) Safety systems Cooling & Ventilation Controls Interlocks Power Converters Safety inspectors Planning Coordination in the field Confidence for the difficult year ahead of us 8h30 meeting