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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Development of a Short Model of the Superconducting Separation Dipoles D2 for the High Luminosity Upgrade of LHC
P.Fabbricatore, A.Bersani, B.Caiffi, R.Cereseto and S. Farinon (INFN Genova)
A.Foussat and E.Todesco (CERN)
• The separation/recombination D2 dipoles
• Updated D2 design
• The short model development
• Next Steps
This work has been performed in the framework of an agreement CERN-INFN
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
The D2 dipoles in HL-LHC: Larger aperture and integrated B strength wrt the D2 dipoles presently in LHC
Characteristics Units ValueAperture mm 105Distance between apertures mm 188
Magnetic length m 7.78Bore field T 4.5Peak field T 5.26Current kA 2.34Temperature K 1.9Load line margin (%) 38Overall current density A/mm2 443Stored energy MJ 2.28
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Magnet lay-out
• Asymmetric coils • Double collars• Separate collar
poles
• Elliptical yoke
• Al-alloy sleeves• Longitudinal tie-
rods
Choices determined by Field Quality and Construction Feasibility/Simplicity
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Details of collared coils integrated into the Al-alloy sleeves
Why Al sleeve solution?
• Repulsive horizontal force up to 196 kN/m
• Collar dimensions and shape determined by the iron geometry magnetically optimised
FxFx
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Integrated Magnetic Field quality
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Short Model
• In 2016 the D2 design achieved a degree of maturity allowingmoving to the following step consisting in the construction ofa short model to be tested at CERN in 2018.
• Aim: checking the design choices and verifying the feasibilityof the magnetic cross talk compensation through asymmetriccoils.
• Activity performed in the framework of a collaborationbetween CERN and INFN having as objectives not only thedevelopment of a short model but also the construction of afull length prototype within the end of 2019.
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
• Outer diameter of external shell 630 mm• Magnetic length 1350 mm• The iron yoke (blue) is not covering the coil ends for limiting the peak field
in these regions. The magnetic steel is here replaced by stainless steel.
Short Model Dimensions
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Short Model: connection side
• No external shell
• Mostly same as the final magnet
• Suspending system for cryogenic test in vertical
• Electrical connection to current leads
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Short Model: opposite to connection side
• Pre-stress up to 250 kN with six tie-rods loaded through super-bolts
• Two central φ33 mm tie_rods
• Four lateral φ25 mm tie_rods
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Main Steps of the Construction Process
• Single collared coils are constructed
• The two coils are integrated into the Al-alloy sleeves with a geometrical gap 0.2mm- 0.3 mm. (During the cool-down the gap will close)
• The two collared coils coupled through the sleeves are integrated into the two halves of the iron yoke (with a geometrical gap of 1.2 mm between them) using a press (270 t/m).
All construction steps, as part of the magnet hystory, were studied trough FE mechaical analysis
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Moke-up for collared coil integration simulation (0.2 mm gap)
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
Coil Ends- End Spacers –Winding Tests
The coils of D2 magnet are asymmetric, causing some complication in the winding operation and requiring attention in the end spacer design.
Preliminary end spacers constructed with a 3D printers and used for winding tests.
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
• The development of the separation/recombinationdipoles D2 for the High Luminosity upgrade of LHC movedfrom design to model construction phase.
• The constructive design has required some designchanges and has underlined some critical operations,requiring specific studies for collared coil integration andcoil ends.
• The construction of the model is planned to be completedwithin spring 2018. It will be followed by the constructionof a full length prototype, presently under engineeringdesign phase, which is taking advantaged from thelessons learned with the short model construction
CONCLUDING REMARKS AND NEXT STEPS
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
SPARE SLIDES
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
VM STRESSES IN COLLARS AND SLEEVES BEFORE COOL-DOWN
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
VM STRESSES IN COLLARS AND SLEEVES AFTER COOL-DOWN
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MN
MX
0
.712E+08.142E+09
.214E+09.285E+09
.356E+09.427E+09
.498E+09.569E+09
.647E+09
AUG 25 2017
12:10:14
NODAL SOLUTION
STEP=19
SUB =9
TIME=19
SEQV (AVG)
DMX =.020647
SMN =1493.19
SMX =.602E+09
1
MN
MX
45280.4
.862E+07.172E+08
.258E+08.343E+08
.429E+08.515E+08
.600E+08.686E+08
.784E+08
AUG 25 2017
12:40:48
NODAL SOLUTION
STEP=19
SUB =9
TIME=19
SEQV (AVG)
DMX =.283895
SMN =45280.4
SMX =.784E+08
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Development of a Short Model of theSuperconducting Separation Dipoles D2 for theHigh Luminosity Upgrade of LHCP.Fabbricatore INFN-Genova
VM STRESSES IN COLLARS AND SLEEVES AT 1.08% NOMINAL CURRENT
1
MN
MX
0
.712E+08.142E+09
.214E+09.285E+09
.356E+09.427E+09
.498E+09.569E+09
.647E+09
AUG 25 2017
12:10:45
NODAL SOLUTION
STEP=40
SUB =4
TIME=40
SEQV (AVG)
DMX =.020496
SMN =4340.01
SMX =.540E+09
1
MN
MX
886135
.106E+08.203E+08
.300E+08.397E+08
.494E+08.590E+08
.687E+08.784E+08
.895E+08
AUG 25 2017
12:41:09
NODAL SOLUTION
STEP=40
SUB =4
TIME=40
SEQV (AVG)
DMX =.283829
SMN =886135
SMX =.895E+08