muon2011
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HCC : Helical Solenoid Development HTS Coil Progress J. Tompkins Fermilab – TD/MSD. Muon2011. The ongoing design, fabrication, and test effort for Muon Collider magnets has a large list of contributors – acknowledgements for this presentation include: Fermilab: - PowerPoint PPT PresentationTRANSCRIPT
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HCC - Helical Solenoid DevelopmentMuon2011
Muon2011 - March 3, 2011
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HCC: Helical Solenoid Development
HTS Coil Progress
J. TompkinsFermilab – TD/MSD
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HCC - Helical Solenoid DevelopmentAcknowledgements
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The ongoing design, fabrication, and test effort for Muon Collider magnets has a large list of contributors – acknowledgements for this presentation include:
Fermilab:– Emanuela Barzi Vadim Kashikhin Vladimir Kashikhin– Mike Lamm Vito Lombardo Mauricio Lopes– Sasha Makarov Mike Tartaglia Katsuya Yonehara– Miao Yu Sasha Zlobin
Muons, Inc.– Gene Flanagan Rolland Johnson Steve Kahn
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HCC - Helical Solenoid DevelopmentOutline
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• Overview• Helical Solenoid Development –
HCC• HTS – YBCO Coil Development • Summary
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HCC - Helical Solenoid Development
Helical Cooling Channel
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• The helical solenoid (HS) concept (FNAL/Muons Inc.) :• Coils follow the helical beam orbit generating solenoidal, helical dipole and
helical quadrupole fields • Multi-section HCC
• Would require 160 meters of magnets • Wide range of fields, helical periods, apertures• Room for RF system• Field tuning is more complicated at high fields• NbTi, Nb3Sn/Nb3Al and HTS in final stage
Early Specs, ca. 2006-K. Yonehara, S. Kahn, R. Johnson et al.
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HCC - Helical Solenoid Development
• Hoop Lorentz forces intercepted by stainless steel rings around the coils
• Transverse Lorentz forces intercepted by support flanges
• Outer LHe vessel shell provides mechanical rigidity to the structure
• The peak stress is ~60 MPa HSM01
HS Mechanical Concept (FNAL)
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HCC - Helical Solenoid Development
4-Coil NbTi Model Fabrication 2010-11
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HCC - Helical Solenoid Development
HSM01 – First Helical Solenoid Model
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• The first helical solenoid model (HSM01) designed, fabricated and tested at Fermilab.
• NbTi SSC cable was used for this model. Left picture shows the winding process.
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HCC - Helical Solenoid Development
Helical Solenoid DevelopmentHSM01 – 1st Model
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Solenoid Parameters
Parameter Units ValueCoil inner diameter mm 426Coil outer diameter mm 455
NbTi SC cable cross section mm12.34 x
1.46Cable Ic (7T,4.2K) A 9660
Jc (non-Cu) A/mm2 1730Copper to superconductor ratio
1.5:1
Strand diameter mm 0.8Helical Orbit Radius mm 255Number of turns/coil 10Coil width mm 20
• HSM01 tested in Nov/Dec 2008 (TD-01-011, PAC09)• Ground insulation issues• Epoxy voids; packing factor• SC lead support• Coordinate system (measurements)
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HCC - Helical Solenoid Development
9Muon2011 - March 3,
2011
A second model HSM02 was been built to improve the solenoid manufacturing technology and performance.
• HSM02 baseline magnetic and mechanical design is the same as for HSM01
• Improved:• mechanical structure and insulation• cable geometry and insulation
• Additional flattening• coil winding and impregnation procedures
• SSC cable re-sized (flattened):• cable test => no degradation
• HSM02 was tested at Fermilab MTF at the end of 2010
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HCC - Helical Solenoid Development
HSM02 Ready for installation in VMTF
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Top plate
30kA power leads
Instrumentation ‘tree’
HSM02
Start: 11/9/2010
Quench Quench Total
1 Initial Check-out - -
2 4.0K Quench Testing, 20 A/sec nom. 29 29
3 4.0K Ramp Rate Studies 13 424 3.0K Quench Testing, 50A/sec 13 55
5 4.0K Quench Testing, 20 A/sec nom. 2 57
6 3.0k, 250 A/sec 16 737 4.5K 7 808 4.5K Heater Tests 17
End: 11/22/2010
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HCC - Helical Solenoid Development
HSM02 Quench Test Results
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HCC - Helical Solenoid Development
Comparison of Quench Results with HSM01
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HCC - Helical Solenoid Development
HSM01, HSM02Comparison of Test Results
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HCC - Helical Solenoid DevelopmentHSM, the next steps
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• Further development of outer field coils (NbTi, Nb3Sn) – depending on resources available, priorities, etc.• HSM03 – same design but with Al rings for coil pre-stress
• HSM04 – Nb3Sn design• Needed for inserts in higher field cooling section
• Different technology – used in LARP/High Field Magnet Program
• Helical solenoid inner coils using HTS (BSSCO wire or YBCO tape) materials• HTS required for inserts in higher field cooling regions• Different technology
• Collaboration with Muons, Inc. to design, build, test first model• YBCO coil development under way
• Final cooling section >40T fields (but smaller aperture)
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HCC - Helical Solenoid Development
HCC - Hybrid HS Model
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• Conceptual design study shows that a Hybrid HS may be needed for HCC• The goal - develop mechanical design and technology for HTS section based on
G2 tape/cable and its assembly with RF and Nb3Sn section • Support structure was designed and prototyped• 12-mm YBCO tape procurement has been initiated by Muons Inc.
This work is partially funded by, and performed in
collaboration with, Muons Inc. (SBIR funded)
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HCC - Helical Solenoid Development
High Field Final Cooling Solenoid‘Generic’ Design
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5
Nb3Sn
NbTi Basic Parameters• Inner bore diameter 50 mm• Length 1 meter• Fields 30 T or higher HTS
materials
Key design issues:• Superconductor type• Jc, effect of field direction (in the
case of HTS tapes)• Stress management • Quench protection• Cost
Conceptual design: • Hybrid coil design• Coil sections
B
Coil radius, m
YBCO / BSCCO
50T Solenoid Conceptual Design
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HCC - Helical Solenoid DevelopmentFSU-NHMFL/ASC
Superconductors – Je plot
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Peter Lee, FSU-NHMFL
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HCC - Helical Solenoid DevelopmentYBCO Tape
(from SuperPower)
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HCC - Helical Solenoid DevelopmentInsert Coil R&D
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Present focus on single and double-layer pancake coils based on HTS tapes.
~20 single and double-layer pancake coils (YBCO and Bi-2223) were built and tested in self-field and external solenoid
Þ Study tape splicing techniques, effect of coil impregnation, coil preload
A modular HTS Insert Test Facility to test up to 14 double-layer pancake coils inside the 14T/16T solenoid (B>20 T)
For the second phase of the coil program, larger multi-section HTS coils will be designed, fabricated and tested to achieve higher magnetic field and force levels.
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HCC - Helical Solenoid DevelopmentYBCO Coil
Parameters
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Conductor SuperPower SCS4050-i
Turn to Turn Insulation
Spiral Wrapped Kapton
Coil Geometry Double Pancake
Coil ID 19 mm
Coil OD 62 mm
Conductor Thickness 0.1 mm
Conductor + Insulation Thickness
0.2 mm
Turns per Single Coil 108
Conductor length per Coil
13.9 m
Overall Conductor Length
27.8 m
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HCC - Helical Solenoid DevelopmentYBCO coil Current vs. Field
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From: “Test of 1st YBCO Helical Solenoid Double Pancake Model”,M. Yu, et al., FNAL TD-11-001, 2/2011
Radial Component Distribution (Field ┴ to the Tape)
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HCC - Helical Solenoid Development
Winding Development
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HCC - Helical Solenoid DevelopmentMagnetic Simulations
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HCC - Helical Solenoid Development
YBCO coil in 13.5T Background Field
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0 100 200 300 400 500 600
-0.02
0
0.02
0.04
0.06
0.08
0.1
Current (A)
Volta
ge (m
icroV
/cm
)
0 100 200 300 400 500 600
-17.5
-17
-16.5
-16
-15.5
-15
-14.5
-14
-13.5
-13
Current (A)
Bz(0
) fro
m H
all P
robe
(T)
Bz(T) vs. Current (A)
Voltage (V/cm) vs. Current (A)
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HCC - Helical Solenoid DevelopmentLooking ahead
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• Focus on high field (HTS) solenoids necessary for cooling sections
• Conductor development has dominated the R&D path• Quality (Jc, stability, uniformity)• Length
• YBCO based solenoid efforts are underway and will continue• PBL/BNL (mostly SBIR funding)• Fermilab/Muons Inc. (SBIR & FNAL/MAP funding)
• YBCO is being produced in industry on pilot lines that can yield 100-200 m lengths – the tapes are not optimized for magnets but various projects using the tapes are underway. R&D support would enhance progress for this very promising technology.
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HCC - Helical Solenoid DevelopmentLooking ahead, cont.
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• VHFSMC (an ARRA funded collaboration) is focused on Bi2212 development
• Phase I – improvement of strand properties
• Phase II – development of small solenoid coils (beginning now) for possible use in MC…
• Future – proposal to DOE being developed
• A Fermilab Bi2212 solenoid development initiative will be discussed in the next talk by Tengming Shen
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HCC - Helical Solenoid Development
Other Fermilab Magnet Efforts
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• LARP Collaboration – BNL, FNAL, LBNL• 2nd generation large aperture IR quadrupoles for LHC
upgrade
• CERN/Fermilab collaboration to develop 11T Nb3Sn dipoles to replace NbTi before IR collimators
• More space in lattice
• Mu2e experiment
• 3 large NbTi solenoids – initial designs, model tests, design, fab, procurement TBD
• Ongoing development for ProjX & ILC
• SC solenoids, split quads, corrector dipoles
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HCC - Helical Solenoid DevelopmentBackup Slides Follow
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HCC - Helical Solenoid Development
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HCC - Helical Solenoid Development
Winding Development, details
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HCC - Helical Solenoid Development
Double Pancake Winding
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