Magnesium Diboride Program
Hyper Tech Research Inc.
Mike Tomsic
Magnesium Diboride Workshop
April 2003
Research Partners:
Ohio State University-LASM
National High Magnetic Field Laboratory
University of Wollongong, Australia
Los Alamos National Laboratory
MgB2 Funding started June 2002
State Of Ohio Technology Action Fund Project
Title: Superconducting Magnesium Diboride Wire
for the Medical and Power Utility Industry.
•2 year -$800,000 Project
•Collaboration in-kind support of over $ 1 million
Collaborators and Research Partners include
6 companies that use superconductor wires,
4 government laboratories,
2 universities,
2 power utility organization
Federal Funding ($920,000) 24 months
SBIR Phase I –MDA admin. by Air Force –Transformers
SBIR Phase I and Phase II– Air Force – MHD magnets
Hyper Tech Research
Continuous Manufacturing Potential
Hyper Tech Research
Best properties has been with Fe barrier in Monel Sheath
With iron –tough to make multifilament- most likely be cabled ,
(twisted) monofilaments for low AC loss conductor, working on
Outer sheaths of Monel, Cu/Ni, and Cu to improve stabilization.
Hyper Tech Research
Reasonable properties can be obtained with all Cu wires,
Or with with Nb barriers in Cu.
Multifilament wires can be made
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Magnesium Diboride Fe/Monel Monofilament 1.2 mm wire.
1e+6
2
Jc, A/cm of SC
1e+5
1e+4
MWJ09 (850/5)
MWJ11 (750/15)
MWJ12 (750/30)
MWJ16 (700/30)
1e+3
Dou (0%SiC)
Dou (5%SiC)
Dou (10%SiC)
MWJ16 (700/30) mag
1e+2
0
2
4
6
8
Magnetic Field, B, T
Testing by Ohio State University , Hyper Tech transport Jcs (plus one magnetic result)
at 4.2 K compared to some of the best magnetic Jcs (5 K) from the literature
Hyper Tech Research
Magnetic Jc, A/cm2
1e+6
1e+5
4.2 K
10 K
15 K
20 K
25K
1e+4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
Magnetic Field, B, T
Magnetic Jc results for the Iron in Monel
30min/700C sample.
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Shows ITER barrel wound with over 1 meter of MgB2 wire,
all Cu sheath, 1.00 mm diameter wire.
The self field transport current for the coil at 4.2 K was 450 amps,
the estimated transport current at 20 K would be 150-180 amps.
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A three strand cable using 0.5 mm wire, that was made with
all Cu sheath, no Fe barrier. The wires tested out at 75 amps
at 4.2 K in self field. This calculates to an average Je of
13,000 A/cm2 and an average Jc of around 40,000 A/cm2 for
4.2 K self field. Based on magnetic Jc for the wire, at 20K,
the Je would be around 4,300 A/cm2 and the Jc would be
around 14,400 A/cm2.
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Winding of the coils
NHMFL
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Coil with wires ready to be soldered to the Cu pads
NHMFL
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SEM micrograph taken from the longitudinal
cross section of the insulated and bent (35 mm diameter)
MgB2 wires. Only Cu sheath and uniform insulation
layer is shown here. The insulation thickness is about 5 m.
NHMFL
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Test coil with all the test leads attached
NHMFL
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Test coil ready to be placed on test rig for testing
NHMFL
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500
Ic-T of the sister sample of the MgB2 Coil-I
Ic-T of the MgB2 Coil-I
450
Critical current (A)
400
350
300
250
200
150
100
50
0
0
5
10
15
20
25
30
Temperature (K)
Ic of coil verses temperature for a coil made
with 20 meters of all Cu sheathed MgB2 1.0 mm
wire compared to short same length of the same wire.
Based on amp-turns, 1.3T at 10K, and 0. 40T at 20K
NHMFL
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Application-low fields (0-0.2T) such as transformers 20-30K
1. All Cu route
A. Stable -over 450 amps for a 1.0 mm dia (at 4K liquid He).
B. At 20K, self field Jc 30,000-100,000 A/cm2
C. SC fraction 30-50% possible, currently at 25-30%
D. Je’s of 10,000-50,000 A/cm2 are possible.
E. Best to date: 1.2 mm, Ic-450 A, 20K, Je =40,000 A/cm2
(self field -using pulsed transport current testing setup)
2.
Fe-Monel route (currently testing Fe/Cu wires)
A. 1.0-1.2 mm wire stable 100-140 amps (at 4K liquid He)
B. At 20 K, self field Jc 100,000-200,000 A/cm2 (magnetic –Jc)
are possible
C. SC fraction 30-50% possible, currently at 25-30%
D. Je’s of 30,000-100,000 A/cm2 are possible
E. Best to date: 0.6 mm, Ic-165 A, 20 K, Je =46,000 A/cm2
(using pulsed tranport current testing setup)
F. Best to date 1.0 mm, using magnetic Jc, SC fill factor –30%
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Je= 66,000 A/cm2
Application-higher fields (1-4T) at 20K- MRI, FCL, generators, motors, etc.
1. Fe-Monel route- present status (just MgB2)(currently testing Fe/Cu)
A. Stable at 140amps for a 1.2 mm dia. (4K liquid He)
( Je –15,000 A/cm2 - working to improve replace Monel with Cu)
B. At 20K, 1T-2T Jc 100,000 –50,000A/cm2 -Possible
C. SC fraction 30-50%
D. Je’s of 1T- 40,000A/cm2, 2T – 20,000A/cm2 possible
E. Best to date: 1T- 1.0 mm, using magnetic Jc, SC fill factor-30%
Je= 30,000 A/cm2
2.
Fe-Monel -Future potential (convert Monel to Cu)
A. How to improve pinning and Jc–( HIP, SiC, MgO doping)
B. At 20K, 4T, Jc 40,000-50,000A/cm2
C. SC fraction 30-50% possible
D. At 20K, 4T, Je 12,000-25,000 A/cm2 - Potential
Started making samples using nano SiC
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Plans for 2003
April -June–Making small coils to test properties over length
Strain tests to determine what diameter coils
can be wind-react, verses react and wind
June – start supplying 80-300 meter 1.2-0.6 mm wire to collaborators
that want to wind and test coils (looking for more collaborators)
June – Dec . Start developing 1km plus lengths
Plans for 2004
Jan-June – supply 1km plus lengths to collaborators for coils
Dec – Be in position to sell wire at: 0.8-1.2mm, $0.50-$1.00/m,
20K-0.2 T -$2.50kA-m, 2T-$5.00kA-m.
Plans for 2005
(Improved pinning and lower boron cost)
Be in position to sell wire at : 0.8-1.2 mm, $0.40-$0.70/m
20K-0.2T -$1.50kA-m, 2T-$3.00kA-m, 4T-$5.00kA-m