magnesium diboride program hyper tech research inc . mike tomsic magnesium diboride workshop
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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. - PowerPoint PPT PresentationTRANSCRIPT
Magnesium Diboride Program
Hyper Tech Research Inc.
Mike Tomsic
Magnesium Diboride WorkshopApril 2003
Research Partners:Ohio State University-LASM
National High Magnetic Field LaboratoryUniversity of Wollongong, Australia
Los Alamos National Laboratory
MgB2 Funding started June 2002
State Of Ohio Technology Action Fund ProjectTitle: 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 monthsSBIR Phase I –MDA admin. by Air Force –TransformersSBIR Phase I and Phase II– Air Force – MHD magnets
Hyper Tech Research
Continuous Manufacturing PotentialHyper 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 onOuter 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
Hyper Tech Research
Magnetic Field, B, T
0 2 4 6 8
J c,
A/c
m2 o
f S
C
1e+2
1e+3
1e+4
1e+5
1e+6
MWJ09 (850/5)
MWJ11 (750/15)
MWJ12 (750/30)
MWJ16 (700/30)
Dou (0%SiC) Dou (5%SiC) Dou (10%SiC)
MWJ16 (700/30) mag
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
Magnesium Diboride Fe/Monel Monofilament 1.2 mm wire.
Magnetic Field, B, T
0.5 0.6 0.7 0.8 0.9 1.0 1.1
Mag
net
ic J c,
A/c
m2
1e+4
1e+5
1e+6
4.2 K 10 K 15 K 20 K 25K
Magnetic Jc results for the Iron in Monel
30min/700C sample. Hyper Tech Research
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.
Hyper Tech Research
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. Hyper Tech Research
Winding of the coils Hyper Tech ResearchNHMFL
Coil with wires ready to be soldered to the Cu pads
Hyper Tech ResearchNHMFL
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.
Hyper Tech Research NHMFL
Test coil with all the test leads attached
Hyper Tech Research
NHMFL
Test coil ready to be placed on test rig for testing
Hyper Tech ResearchNHMFL
0
50
100
150
200
250
300
350
400
450
500
0 5 10 15 20 25 30
Temperature (K)
Cri
tica
l c
urr
ent
(A)
Ic-T of the sister sample of the MgB2 Coil-IIc-T of the MgB2 Coil-I
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 Hyper Tech Research
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 possibleC. 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% Je= 66,000 A/cm2 Hyper Tech Research
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 SiCHyper Tech Research
Plans for 2003April -June–Making small coils to test properties over length Strain tests to determine what diameter coils can be wind-react, verses react and windJune – 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 2004Jan-June – supply 1km plus lengths to collaborators for coilsDec – 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