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.

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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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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

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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.

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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. 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

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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