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

MgB 2 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 Hyper Tech Research

Testing by Ohio State University, Hyper Tech transport J c s (plus one magnetic result) at 4.2 K compared to some of the best magnetic J c s (5 K) from the literature Hyper Tech Research Magnesium Diboride Fe/Monel Monofilament 1.2 mm wire.

Magnetic J c results for the Iron in Monel 30min/700 C sample. Hyper Tech Research

Shows ITER barrel wound with over 1 meter of MgB 2 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 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/cm 2 and an average Jc of around 40,000 A/cm 2 for 4.2 K self field. Based on magnetic Jc for the wire, at 20K, the Je would be around 4,300 A/cm 2 and the Jc would be around 14,400 A/cm 2. 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) MgB 2 wires. Only Cu sheath and uniform insulation layer is shown here. The insulation thickness is about 5 m. Hyper Tech ResearchNHMFL

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 Research NHMFL

Ic of coil verses temperature for a coil made with 20 meters of all Cu sheathed MgB mm wire compared to short same length of the same wire. Based on amp-turns, 1.3T at 10K, and 0. 40T at 20K NHMFLHyper 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 A/cm 2 C. SC fraction 30-50% possible, currently at 25-30% D. Jes of 10,000-50,000 A/cm 2 are possible. E. Best to date: 1.2 mm, Ic-450 A, 20K, Je =40,000 A/cm 2 (self field -using pulsed transport current testing setup) 2.Fe-Monel route (currently testing Fe/Cu wires) A mm wire stable amps (at 4K liquid He) B. At 20 K, self field Jc 100, ,000 A/cm 2 (magnetic –Jc) are possible C. SC fraction 30-50% possible, currently at 25-30% D. Jes of 30, ,000 A/cm 2 are possible E. Best to date: 0.6 mm, Ic-165 A, 20 K, Je =46,000 A/cm 2 (using pulsed tranport current testing setup) F. Best to date 1.0 mm, using magnetic Jc, SC fill factor –30% Je= 66,000 A/cm 2 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/cm 2 - working to improve replace Monel with Cu) B. At 20K, 1T-2T Jc 100,000 –50,000A/cm 2 -Possible C. SC fraction 30-50% D. Jes of 1T- 40,000A/cm 2, 2T – 20,000A/cm 2 possible E. Best to date: 1T- 1.0 mm, using magnetic Jc, SC fill factor-30% Je= 30,000 A/cm 2 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/cm 2 C. SC fraction 30-50% possible D. At 20K, 4T, Je 12,000-25,000 A/cm 2 - Potential Started making samples using nano SiC Hyper Tech Research

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 meter 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: mm, $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 : mm, $0.40-$0.70/m 20K-0.2T -$1.50kA-m, 2T-$3.00kA-m, 4T-$5.00kA-m