A Joint Proposal for US-Japan Cooperation Program
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Transcript of A Joint Proposal for US-Japan Cooperation Program
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A Joint Proposal for US-Japan Cooperation Program
• Proposal to JSPS US-Japan collaboration fund• R&D of superconducting magnet technology for high
intensity muon beam line• KEK
– ARL, Cryogenics Science Center• T. Ogitsu, N. Kimura, T. Nakamoto, K. Sasaki, K. Tanaka, A. Yamamoto,
– IPNS, Cryogenics Group• Y. Makida, T. Okamura
• FNAL– Technical Div.
• M. Lamm, A. Zlobin, V. Kashikhin, E. Barzi, S. Feher, J. Tompkins
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Term• 2009~2014• Phase I (mainly 2009~2011)
– Near term – Projected for Mu2e and COMET
• Phase II (mainly 2011~2014)– Long term– Projected for future high intensity muon beam line– Eventually for Neutrino Factory and Muon Collider
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Phase I R&D12206
25687
Mu2eCOMET
Pion Capture SolenoidR&D forMu2e and COMET
Requirement• High Field
– More pion to capture– More (better) conductor– Larger stored energy ~5T for COMET and Mu2e
• High Radiation – High Power Beam– Heat Load– Radiation Damage~10 W for COMET
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High yield strength
Al stabilized conductor
NbTi
base for field
up to
5
T
• Superconductor requires good normal conductor as stabilizer and quench protection
• Copper is the standard– Density: 8920 Kg/m3
• Aluminum is also a good normal conductor– Density: 2700 Kg/m3
– More transparent against radiation– Can provide less heat load with the same
stabilization property
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High Yield Strength Al stabilized Conductor R&D
• For High Energy Physics– Higher Field : > 5 Tesla– Larger Size : Diameter 〜 10m
• Combination of Various Technology
– ATLAS Al Ni Alloy• Ni-0.5 ~ 1 %
– CMS-Hybrid Support • A6058 -->> A7020
Y.S.(0.2%) = 400 MPaRRR = ~ 400
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An R&D Work using ATLAS-CS Conductor + A6061-T6
• T.S. is > 50 % reinforced with A6061using Electron Beam, and Laser Beam Welding
• LBW may be a potential technology EBW, LBW
Laser Beam Welding
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Phase I R&D: Prototype Solenoid
• Fabricate prototype pion capture solenoid• Test items
– Mechanical stability– Heat load stability– Quench protection
• including coupling
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Phase I R&D Plan2009 2010 2011
Conductor R&D Design Proto Conductor Fab.
Coil R&D Conceptual Design Proto Coil Fab. Proto Coil Test
Real Magnet Detail Design Magnet Production
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Phase II R&D• Aim for future high intensity muon beam line
– Eventually neutrino factory or muon collider• More Muon
– Higher Field (20 T and more)– Higher Beam Intensity = Higher Heat Load
• Advance conductor– Nb3Sn, Nb3Al, MgB2, YBCO, BSCCO– Aluminum stabilizer or aluminum jacket cable in
conduit cable• Study on Design Issues associated with using
advanced conductor
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Conductor Choice for Higher Field and Higher Stability
Material Tc Hc2 ( T= 4.2 K) Mass Density
Nb-Ti 9 K 10 T 6000 Kg/m3
Nb3Sn 18 K 28 T 7800 Kg/m3
Nb3Al 18.5 K 30 T 7200 Kg/m3
MgB2 39 K 60 T 2500 Kg/m3
YBCO 90 K > 50 T 5400 Kg/m3
BSCCO 110 K > 50 T 6300 Kg/m3
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A15 (Nb3Al, Nb3Sn)For now the best candidate for high field application
05001000150020002500300035004000
02468101214161820222426
NbTi(4.2K)NbTi(1.9K)(NbTa)3Sn(PIT)Nb3Sn(RRP)Nb3Al(RHQT)Nb3Al(RHQT)Jc (A/mm2)
B(T)
Nb3Sn strand Nb3Al strand
Al stabilizedNb3Al Conductor(NIFS)
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Toward Higher Beam Power
• Cable in conduit– Removal of large
heat load
Nb3SnRutherford cable
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MgB2
Monel 400 sheathed
Diameter: 1.13mmComposition MgB2 (Vol %) 14.6Fe (Vol %) 10.8Cu (Vol %) 13.8Ni (Vol %) 15.8Monel 400 (Vol %) 45.0
Cost: 3€/m
Commercial products are now being available.Low field performances are good up to 20 K, 2 THigh field field performance are under development
0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8
0
50
100
150
200
250
300
350
400
Crit
ical
cur
rent
(A)
Magnetic field (T)
16 K 20 K 24 K 30 K
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High Tc Conductors
• 22 T already achieved• Possibility to go beyond
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Issue
• Needs stabilizer for stability and quench protection
• Need large conductor for higher operation current, i.e. less inductance
• Aluminum stabilizer?• Aluminum jacket cable in conduit?• Hybrid magnet structure for efficiency
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R&D Schedule & Budget2009 2010 2011 2012 2013 2014
Phase I Conductor R&D20MJYen
Proto Coil
25MJYen
Proto Coil Test10MJYen
Proto Coil Test2MJYen
Test Analysis1MJYen
Test Analysis1MJYen
Phase II Conductor Basic R&D5MJYen
Conductor Basic R&D5MJYen
Conductor R&D20MJYen
Proto Cond.Fab.28MJYen
Proto Coil Fab.29MJPYen
Proto Coil Test20MJYen
Cont. 10MJYen 5MJYen 5MJYen 5MJYen 5MJYen 4MJYen
Travel 3MJYen 3MJYen 3MJYen 3MJYen 3MJYen 3MJYen
Total 38MJYen 38MJYen 38MJYen 38MJYen 38MJYen 28MJYen
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Other staff
Transport SolenoidR&D at KEK
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J-PARC Muon Beam Line
• Field; ~2T• Aparture; ~0.4 m
• Limited Access to shielded area– Refrigerator must be
outside of shield– Limited Space for the
refrigerators– Long distance to cold head
to coil front– Conduction Cooling with
Higher Temperature
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Trial Winding of Curved Section with MgB2 conductor
• Purchase two kinds of MgB2 conductor from Columbus SC– 1 is the 1.13 mm diameter round wire
• Will be wound by a company
– 2 is the 1.5 * 2.5 mm square wire• Will be wound by Nakahara and Adachi at KEK
• They will be wound this winter and Tested in next spring
R&D Coil made at KEK in houseNbTiAlready woundTest just startedMgB2 version is also planned
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R&D on Transport SCSolenoid Coil by company
will be wound till Mar.
R&D on trim dipole coil