Post on 28-Jan-2016
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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
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
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
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
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
Phase I R&D: Prototype Solenoid
• Fabricate prototype pion capture solenoid• Test items
– Mechanical stability– Heat load stability– Quench protection
• including coupling
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
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
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
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)
Toward Higher Beam Power
• Cable in conduit– Removal of large
heat load
Nb3SnRutherford cable
MgB2
Monel 400 sheathed
Diameter: 1.13mmComposition MgB2 (Vol %) 14.6Fe (Vol %) 10.8Cu (Vol %) 13.8Ni (Vol %) 15.8Monel 400 (Vol %) 45.0
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
High Tc Conductors
• 22 T already achieved• Possibility to go beyond
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
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
Other staff
Transport SolenoidR&D at KEK
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
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
R&D on Transport SCSolenoid Coil by company
will be wound till Mar.
R&D on trim dipole coil