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Activities on the triplets at CERN
• Reception and Acceptance• Triplet String Assembly in Building 181• Handling and Transport• Preparation for Installation• Tests carried out in the tunnel• Repairs• Present Status
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Reception and Acceptance
• Acceptance tests to be performed following shipment: Q1: Acceptance Plan for LQXA LHC-LQX-TP-0002
Q2: Acceptance Plan for LQXB LHC-LQX-TP-0001
Q3: Acceptance Plan for LQXC LHC-LQX-TP-0003
DFBX: Acceptance Plan for Inner Triplet Distribution Feedboxes LHC-DFBX-ES-0001
D1: Acceptance Plan for Beam Separation Dipoles LBX LHC-MBX-ES-0003
• Tests to be perform at CERN according to these documents Physical inspection Mechanical measurements Electrical measurements
• Coil resistance
• Quench protection heater resistance
• Coil inductance
• Insulation resistance
• Leakage current measurements
• Thermometer resistance
• Warm-up heater resistance
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LReception and Acceptance
Physical inspection in Building 181 Visual inspection of containers and shockwatches fasten on it
Removal of the container and inspection of the transport restraints
Transport data recorder return to sender for analysis
Removal of transport restraints and “spider” inspection
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Electrical measurements in Building 181
Electrical checks and measurements• Coil resistance• Quench protection heater resistance• Coil inductance• Insulation resistance• Leakage current measurements• Thermometer resistance• Warm-up heater resistance• Continuity of leads, busses and instrumentation for the DFBX
Polarity checks using a rotating mole
Leak checks on the internal pipes of the DFBX
8 K A
8 K A
E
E
H 1+
V1+
C /SS/C
Q1C orrec tion
Co il
S
S
S
C
C
S
H 1-
V1-
IHi
I Lo
VHi
VLo
4 Wire Measuring Device
1.234
Fermi ‘Break Out’ Box
J4
'13 F’Q1-Q2Connector
‘B’
‘A’
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Geometrical measurements in Building 181
Alignment stability• Cold mass length• Cryostat length• Cartography of the tubes at the cold mass ends• Cold mass horizontal and vertical shapes• Position of the cold mass within the cryostat• Comparison with FNAL data
OR
Fiducialisation• Same as above with different measurement methods• Geo Mole + AC Mole measurements to increase the accuracy on the magnetic
axis determination
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Triplet String in Building 181
String assembled in April 2005 with the collaboration of FNAL, AT/CRI, AT/MEL, AT/VAC, TS/IC, TS/SU
Check availability of components and tooling
Assemble interconnects, check tooling and procedures
Perform instrumentation and continuity checks for the string from DFBX
Mount and check alignment equipment
Check string behaviour under insulation vacuum
Check handling equipment
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Triplet String in Building 181
What was learned:
Validation of most components and tooling for the interconnections Demonstration of interconnect procedures in conditions close to the ones in the tunnel Polarity of magnets confirmed in the string Instrumentation and continuity from DFBX confirmed Alignment of magnets under vacuum confirmed Limited rigidity of the jacks and their supports
Actions: Some tools and components had to be improved Procedures were refined BPMS signal cables redesign due to interference with Q2 thermal shield Thermal shield of DFBX/D1 interconnection had to be modified A software bug corrected in survey applications
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Handling and Transport
Mean(s) Container Restraints Data Recorder
US to CERN Truck / Boat / (Plane)
Q1/Q3 Fixation on transport Frame inside a metallic container 1 per side
ShockwatchAcceleration Recorders
Q2 Fixation on transport Frame inside a wooden box 1 per side
D1 Fixation on transport Frame inside a metallic container 1 per side
DFBX Fixation on transport Frame inside a wooden box Springs
181 ↔ storage
↔ Smi2Truck
Q1/Q3
1 per side
SchocklogsQ2 1 per side
D1 1 per side
DFBX covered truck
Smi2 ↔ 181 ↔ storage
Truck
Q1/Q3
1 per side
SchocklogsQ2 1 per side
D1 1 per side
DFBX covered truck
Installation Truck
Q1/Q3
1 on the non IP side
SchocklogsQ2
1 on the non IP side
D11 on the non IP side
DFBX covered truck
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Handling and Transport
radial direction (R)
longitudinal direction
(S)
vertical direction (T)
HCLQXA_001-FL000001 0.16 -0.87 0.48
HCLQXA_001-FL000002 -0.30 -4.17 1.20
HCLQXA_001-FL000004 0.03 0.79 0.95
HCLQXA_001-FL000005 0.02 0.45 1.09
HCLQXA_001-FL000006 0.21 0.40 -0.27
HCLQXA_001-FL000007 -0.23 -0.25 0.95
HCLQXA_001-FL000008 -0.06 1.04 0.81
HCLQXA_001-FL000009 -0.08 2.45 0.53
HCLQXB_001-FL000001 0.03 0.63
HCLQXB_001-FL000002 -1.03 -0.78 0.72
HCLQXB_001-FL000003 -1.03 0.72
HCLQXB_001-FL000004 -0.11 0.15 -0.37
HCLQXB_001-FL000005 0.08 3.72 0.55
HCLQXB_001-FL000006 0.36 -1.10 0.52
HCLQXB_001-FL000008 -0.05 -0.85 0.54
HCLQXB_001-FL000009 -0.27 -0.20 0.60
HCLQXB_001-FL000010 -0.31 0.69 0.58
HCLQXB_001-FL000011 -0.03 -0.66 0.26
HCLQXC_001-FL000003 0.11 -0.99 0.60
HCLQXC_001-FL000004 -0.12 1.34 0.60
HCLQXC_001-FL000005 -0.04 0.47 0.65
HCLQXC_001-FL000006 -0.02 -2.99 0.88
HCLQXC_001-FL000007 0.16 -4.20 0.58
HCLQXC_001-FL000008 -0.30 1.26 0.18
HCLQXC_001-FL000009 0.14 -2.57 0.59
RMS 0.32 1.90 0.35
HCLQXA_001-FL000003 -0.46 -26.79 -2.01
HCLQXC_001-FL000001 0.08 -9.14 0.05
HCLQXC_001-FL000002
Cold mass displacements within the cryostat during transport from the US To CERN
3 assemblies were broken during transport probably due shocks between wagons as they were shipped by train :
Q3R8 cold mass has moved by ~3mm during transport to the tunnel without any shocklog alarm
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Preparation for Installation
• Mechanical preparation to put the different interfaces in conformity Thermal shield modification of the D1 Flange replacement to remove NCs (D1 and DFBX)
• Preparation in Smi2 Cold bore cleaning Beam screen insertion Pick up connection Cold warm transition assembly Thermal shield closing MLI insulation O-Ring seals installation Vacuum vessel closing Bearing pieces fixation
• Preparation of the DFBX in 181 Electrical instrumentation preparation Frames assembly and instrumentation box Warm gas recovery line assembly and vacuum test Control valves installation on each line Differential pressure valves installation
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Tests carried out in the tunnel
• Vacuum tests in L8 (22 Sept. 06) and R8 (17 Nov. 06) Monitoring the various displacement of the assemblies and supporting
system under insulation vacuum
Result: OK
Go ahead with the pressure test
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Tests carried out in the tunnel
• Pressure test in L8
Guarantee the inner triplet piping mechanical stability under He pressure at warm
Result: Test interrupted at 12 bars by X line bucklingCause of rupture : brazed joints anneals the extremities of the tubes
All the exchanger tubes in Q1, Q2, Q3 have to be replacedPressure test L5 after repair to qualify X line replacement and the complete design
Design Pressure
Test Pressure
LD1/LD2 21 bars 26bars
CY/XB 5bars 6bars
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Tests carried out in the tunnel
• Pressure test in L5 (27 march 2007) Guarantee the inner triplet piping mechanical stability under pressureValidate the new X line along the triplet (copper corrugated tube + interconnections)Monitor the H pieces displacement under pressure
Result: Test interrupted at 20 bars when the support system broke and M1 bellows rupturedCause of rupture: axial movement of Q1 cold mass towards the IP
The heat exchanger circuit remained leak tight even after the cold masses displacementX line replacement on the other triplets continue as planedThe cold mass support system of all Q1 and Q3 has to be reinforced
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Repairs
“Spiders” replacement on the 3 assemblies that were broken during shipment to CERN
• Removal from the vacuum vessel• MLI and thermal shield removal• “Spider” exchange (3/4) or repair (1/4)• Cold mass recryostating• Leak test of pipes that were cut to remove the spiders
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RepairsX tube removal and installation of new tubes
• Removal of the heat exchanger tube Removing the vacuum vessel dome in front of Q1 Cutting fix point between L and X lines on Q1 and Q3 L line extremities cutting Extracting the copper corrugated tube
• Installation of the new heat exchanger tube Replacement of L line flanges and M4 line bellow Insertion of the new copper corrugated tube Welding fix points at the extremities
• Interconnection of the X, L and M4 circuits (see C. Garion’s presentation) Installation of the “H” pieces Welding X line Leak test of the exchanger circuit from the Q1 to Q3 Welding M4 and L lines Leak test on the cold mass circuit
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Present Status
R1 L2 R2 L5 R5 L8 R8
6(/8) triplets were installed in the tunnel
21(/28) cryomagnets and 6 (/8) DFBX were installed
5(/8) triplets were interconnected (at least the bus bars connections)
2(/8)triplets were pressure tested in the tunnel
15(/24) new exchanger tubes were produced
10(/24) exchanger tubes were exchanged
3 cryomagnets and one DFBX have to come out of the tunnel
1 cryomagnet have to be replaced by its spare and has to be de-cryostated to exchange the supports
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Standard actions summary and information