LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits CERN 06/09-10/09 Technology Department (TE) Group (MPE) : The Machine Protection & Electrical Intergrity Design, construct, operate, maintain electrical equipments of magnets superconducting circuits. T.Roulet 1 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits ELQA Team Magnets/Circuits Types of Tests Conditions/Method Results Non conformities MAGNETS TP4 DOC MIC PARAMET HVQ IRC ICC ORC QHR TFM T.Roulet 2 16/12/2009

Electrcal Quallif of Magnets Superconducting Circuits LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits ELQA : 28p CERN Staff: 4p Polish collaboration (Phy.Nucl.Inst.Krakovi): 18p Help from PH department: 2p Help from SubContrators: 4p 5 Teams of 2 / Shift 2 X 8 / 4 Months T.Roulet 3 16/12/2009 T.Roulet 15/11/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Magnets 9672 MAGNETS / 1232 CRYOSTATS / 3552 Circuits Tested by ELQA For 1 Sector Magn Circuits Power MB main dipoles MQ quadrupoles MCD decapole MCS sextupoles MCO octupoles MQT quadrupoles MQTL quadrupoles MQS quadrupoles MS sextupoles corrector MSS skew sextup. Correct. MO octupoles correctors MCBC dipoles correctors MQM Ins.Reg.Quadrup. MCOSX Multip. Correct. MCBC Orbit. Correct. 154 168 156 308 60 4 8 85 6 40 30 22 10 2 1 5 3 18 13kA 5.9kA 600A 120A MCB Dipoles Orbit Correctors 114 80 A NbTi + Cu (ø 1 mm) Supraconducting Cable 6kA Quadripôles LHC (15 mm x 1,6 mm) T.Roulet 4 16/12/2009

(Quench Protection System) Dipoles Orbital Correct. LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Type of Circuits Tested : TP4/DOC/MIC TP4 Tests : 106x8 Circuits Main Magnets Circuits (50m 3km) MIC Tests : 224x8 Local Circuits Magnets Instrum. Check (Quench Protection System) Feed Box DOC Tests : 114x8 Local Circuits Dipoles Orbital Correct. T.Roulet 5 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits TP4 Tests : Magnets Supercond. Circuits HVQ  = Magnets Circuits Insulation (High Voltage Qualification) ORC/IRC = Magnets resistance/Potentiel taps resistance (Ohmic Resistance Check/Instrumentation Resistance Check) ICC  = Potentiel Taps Order Instrumentation Continuity Check TFM  = Magnets Circuits Impedance (Transfert Function of the Magnet) TP4:HQV_IRC_ICC_ORC_TFM Feed Box Feed Box EX 1 SECTOR : 1 MAIN DIPOLES CIRCUIT =154 MAGNETS / 3Km T.Roulet 6 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits DOC Tests : Local Dipoles Orbital Correctors Circuits HVQ  = Magnets Circuits Insulation (High Voltage Qualification) ORC_IRC = Magnets resistance_Pontentiel taps resistance (Ohmic Resistance Check_Instrumentation Resistance Check) TFM  = Magnets Circuits Impedance (Transfert Function of the Magnet) DOC:HQV_ORC_IRC_TFM T.Roulet 7 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits MIC Tests (Local Magnets Instrum. Check) : Quench Heaters Circuits QH_HVQ = Quench Heaters Circuits Insulation (Quench Heaters High Voltage Qualification) QHR = Quench Heaters Resistance IRC  = Instrumentation Resistance Check (Potentiel Taps) Proxim. Equip. Potentiel Taps Quench Heaters T.Roulet 8 16/12/2009

Electrcal Quallif of Magnets Superconducting Circuits LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Conditions : Warm flushing Cool-down 80K 1.9K DOC (Dip.Orbt.Cor): 912 CIRCUITS HQV_IRC TFM HQV_IRC_TFM MIC (Magnets Instrum. Check): 1792 CIRCUITS QHVQ QHR_IRC QHVQ_QHR_IRC TP4 (Magnets Circuits) : 848 CIRCUITS IRC_ORC ICC_TFM HVQ HVQ_IRC_ORC 23880 TESTS ELQA by Shut-Down Shut-Do. Act ELQA Tests Cryo Tests ELQA Tests Power Tests T.Roulet 9 16/12/2009 T.Roulet 15/11/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Method : TP4 DOC MIC Equip. used DC Power Supply HV Power Supply Hz Gene. LabView 3 Programms ELQA Results CERN Web page ORACLE T.Roulet 10 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Method : Parameters 10 10000 TP4 Cryo Conditions 1 DOC T.Roulet 11 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits LHC monitoring Sector 6.7 Cool-Down Monitoring system during Cool-Down Leakage current 1mA current nA 5 weeks T.Roulet 12 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : TP4_HVQ Main Dipoles : 154 Magnets Applied HV : 1900V Limit Leakage current : 50µA Voltage (V) 25 min Final Leakage current 21µA current nA Insulation Pb. between. Current Lead & Converter Pb with newQPS cables 5 min T.Roulet 13 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : DOC_HVQ Orbit Corrector : 1 Magnet Applied Voltage = 600V Limit Leak. current= 1000nA current nA Final Leak. Current = 821 nA Water inside the basket Final Leakage current = 30nA current nA 1 min T.Roulet 14 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : MIC_QHR_HVQ Final Leakage current = 42nA Magnet Instrum : 1 Quench Heater Applied Voltage = 2000V Limit Leak. current= 1000nA current nA Pb. Dust on PCB Final Leakage current = 8nA current nA 1 min T.Roulet 15 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : MIC_QHR_HVQ 1 Quench heater of Q1 magnet sector 12 = weak electrical insulation: Breakdown at 1200V Discussions between the magnet manufacturer (KEK Japan), people responsible for the integration (BNL, USA) and CERN. Was the test voltage appropriate (1200 V)? Can we protect this magnet with 1 only quench heater (out of 2)? Inspection of the Harting connectors installed on top of the Feed Box. T.Roulet 16 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : TP4_ORC Main Quadrupoles Resistance: 154 Magnets Applied current = 1.5A Limit Resistance = 200µ Ω Pb. Cryo Conditions Final resistance (513 µ V)=> 335µΩ Final resistance (157µ V)=> 102µΩ T.Roulet 17 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : TP4_ORC First sector cooled down this year =>, Adjusting cryo. parameters Resistance µΩ T.Roulet 18 16/12/2009

Pb. Instrumentation Cable LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : TP4_IRC Pb. Instrumentation Cable Main Quadrupoles Potentiel Taps of Current Lead: Applied current = 1A Limit Resistance = 3Ω Resistance Ω Potentiel Taps Resistance Ω Potentiel Taps T.Roulet 19 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : DOC_IRC Dipole Orbit Correct. Potentiel Taps of Current Lead : Applied current = 1A R limit VTap_C/ VTapW = 1mΩ R limit VTap_L_W/VTap_H_W = 2mΩ Pb. Cryo Conditions T.Roulet 20 16/12/2009

Tolerance with Parameters LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : MIC_IRC Magnet Instrumentation : Potentiel Taps for Quench Heaters Applied current = 1A R limit = 4Ω Resistance Ω Potentiel Taps Tolerance with Parameters T.Roulet 21 16/12/2009

Pb. With Update Parameters LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : MIC_QHR Magnet Instrumentation : Quench Heaters Resistance: Applied current = 200mA R limit = 26Ω Resistance Ω Quench Heater Pb. With Update Parameters T.Roulet 22 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : DOC_TFM Dipople Orbit Correct : Impedance Applied voltage = 10Vrms +90° Phase deg. Modulus Ω x1/ω xω -90° Frequency(Hz) T.Roulet 23 16/12/2009

Pb. Defective Solartron LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Results : TP4_TFM Main Dipole : Impedance Applied voltage = 2.5 Vrms +90° Modulus Ω Phase deg. xω Pb. Defective Solartron Frequency(Hz) T.Roulet 24 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Non Conformities : MIC_QH_HVQ Magnet Instrumentation : MB2413,A22R1 Quench Heaters Insulation: Applied voltage = 600V Leak. Current limit = 1µA Final Leak. Current = 11.2µA current µA 1 min To high leakage current High Field quench heaters. Low Field quench heaters are healthy. LowFields used as nominal protection instead of HighFields T.Roulet 25 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits Non Conformities A26L2 V.tap EE211 found open, V.Tap Circuit shorted T.Roulet 26 16/12/2009

LHC Hardware Commissionning Electrical Qualif. of the Magnets Superconducting Circuits CONCLUSION Cryogenics conditions. Measurements accumulated on all LHC circuits => refine tolerances (process still on-going). New Qualifications of the “new.QuenchProtectionSystem”. T.Roulet 27 16/12/2009