1. 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 /12/2009

2. 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 /12/2009

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

4. LHC Hardware Commissionning
Electrical Qualif. of the Magnets Superconducting Circuits
Magnets
9672 MAGNETS / CRYOSTATS / 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 /12/2009

5. (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 /12/2009

6. 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 /12/2009

7. 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 /12/2009

8. 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 /12/2009

9. 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): 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 /12/2009
T.Roulet /11/2009

10. 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 /12/2009

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

12. 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 /12/2009

13. 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 /12/2009

14. 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 /12/2009

15. 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 /12/2009

16. 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 /12/2009

17. 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 /12/2009

18. 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 /12/2009

19. 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 /12/2009

20. 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 /12/2009

21. 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 /12/2009

22. 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 /12/2009

23. 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 /12/2009

24. 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 /12/2009

25. 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 /12/2009

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

27. 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 /12/2009