Agency: Department of Energy | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 150.00K | Year: 2015
This proposal is submitted in response to the SBIR/STTR High Energy Physics Solicitation Topic 29a). Superconductor Technologies for Particle Accelerators, a) High-Field Superconducting Wire Technologies for Magnets. The need is for strands that operate at a minimum of 12 Tesla T) field, with preference for production scale > 3 km continuous lengths) wire technologies at 15 to 25 T. The strands are preferred to have higher engineering current densities, at least 400 amperes per square millimeter of strand cross-section at the target field of operation and 4.2 K temperature, and have reduced effective filament diameter, in particular to less than 30 micrometers at 1 mm wire diameter, with minimal concomitant reduction of the thermal conductivity of the stabilizer or strand critical density. Hyper Tech has fabricated Nb3Sn strands with our tube approach strand with 200-900 filaments at 0.7 mm OD in kilometer lengths. While the deff sizes and stabilities of these strands are excellent, and the conductor performance is very good at 2500 A/mm2 at 12 T, it would be very useful for HEP applications to push the non-Cu Jc in these strands with high filament counts way beyond the 3000 + A/mm2 -12T level potential for 50% plus improvement based on preliminary data). A promising approach for achieving this is to dramatically increase the layer Jc thereby increasing the overall non-Cu Jc in the strands. To do this, we have focused and found a new way on creating artificial pinning centers within Nb3Sn strands to increase flux pinning while maintaining high Sn content and high fractions of active high quality, current carrying A15) Nb3Sn area in the strand cross section, in order to raise the Jc overall in the 12-20T range. In this Phase I firstly we will focus on developing a strand with enhanced pinning, while not sacrificing Bc2 or area fraction. We will start by fabricating a subelement designed to generate artificial pining centers during the reaction phase so as to increase the layer Jc and non-Cu Jc of the strand. By creating artificial pinning center in the reacted A15 area we will increase the layer Jc of the strand. We will then make restacks of the subelements. Our goal is to achieve strands with increased layer Jcs, and non-Cu Jc in the strand well over 3000 A/mm2 at 4.2 K -12 T, and over 1800A/mm2 at 4.2K - 15T standard Tube type strands have similar layer Jc values to internal-Sin distribute barrier or RRPTM) strands, but lower fractions of fine grain). We will demonstrate and optimize billet lengths that exceed 3km piece lengths at 0.7 and 1.0 mm diameters with subelements of 45 micrometers or less in a proposed follow-on Phase II. The success of this SBIR will lead to a strand that can achieve non-Cu Jc at 12T-4K of over 3000A/mm2 while keeping the deff of range 30-35 m. The idea is to increase the layer Jc values by the use of artificial pinning centers. Using this approach, we can maximize the non-Cu Jc of these Tube type strand designs.
Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase II | Award Amount: 750.00K | Year: 2014
This SBIR Phase II proposal overcomes technology barriers for developing highly efficient all electric aircraft systems for the future, with limited impact to the environment. Turboelectric propulsion for aircraft applications is envisioned, and cryogenic and superconducting components are sought. In particular, low AC loss superconducting wires for the stator windings and superconducting wires with filaments less than 10 micrometers in diameter are of interest. There is an intense push in the aircraft industry to ultimately develop an all-electric aircraft, with liquid hydrogen and fuel cells being considered as the prime generation source for aircraft propulsion. The U.S. is in competition with Europe for the development the next generation all-electric aircraft. Superconductivity especially magnesium diboride (MgB2) superconductors are considered an enabling technology that is being investigated by NASA, Air Force, Rolls-Royce, Airbus and EADS. This means the need for a low cost, low AC loss (fine filament superconductor) that can operate in the 10-25K temperature range in 0-2 tesla fields for superconducting stators for motors and generators. This wire is need by 2016-2017 time frame so all cryogenic motors and generators can fabricated and tested in the NASA test bed. In the Phase I Hyper Tech has shown that fine filament MgB2 wires can be fabricated and there is potential for low AC losses in the 60-400 Hz range for stators. In the Phase II Hyper Tech will continue to work on developing, manufacturing, and testing fine filament MgB2 wire. The wires will also be twisted to reduce coupling losses. The wires will be tested for their superconductor and engineering current density and AC losses. The result of this work will be a low AC loss MgB2 superconductor wire for enabling all-electric aircraft development and allow the U.S. industry to lead the world in this needed and rapid developing technology.
Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 123.19K | Year: 2015
This proposal is for the development of conductors with improved electrical conductivity and/or ampacity better than copper or aluminum. Electrical conductors are key components for just about every power device or system. Copper is presently the conductor of choice, based on high performance, low cost, and ease of use. However, increasing demands for power and data push the need for more capacity, and the total contribution of electrical conductor weight to the system has become significant in aircraft, ships, rail, and automobiles. Thus, the development of a commercial, low-cost, light-weight, highly conductivity wire is an important objective to improve energy efficiency and reduce the weight/amp of power. In this Phase I and eventual Phase II we propose the development for carbon nanotube (CNT) metal based current carrying composites. We will focus on CNT additions to two base metals, Cu and Al, and the composites made with them as base metals. We will focus on composites that have a high density of carbon nanotubes. Our objective is developing methods to functionalize the connection between carbon nanotubes such that the connections have low resistance. We will focus on the properties of conductivity, and ampacity (maximum current which can be carried per area of cross section). Our focus will be demonstrating methods of improvement in Phase I and optimization of the best options in Phase II and also fabrication of long length wires in a Phase II effort.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 150.00K | Year: 2014
ABSTRACT: This proposal is aimed at the development of an electrical conductor that is lighter weight and has two- to three-times higher current carrying ability per weight when compared to rated copper (Cu) or aluminum (Al) wires for Air force applications. Our approach will be to generate a carbon nanotube/Cu composite using a metallized carbon nanotube forest approach. We will explore CNT forests grown on growth substrates and later removed and those grown directly on a metal substrates. The CNT forest will then be metalized by electroplating process to form CNT-Cu composites. The composites will then be tested for conductivity and ampacity. The objective is to demonstrate the feasibility of a carbon nanotube/Cu composite which will target the best combined conductor properties for Air Force (AF) applications, combining high electrical current per weight, electrical conductivity, flexibility, mechanical strength, and stability using a scalable and affordable fabrication method. BENEFIT: The results of this work can lead to the development of high ampacity conductors for air force applications, in particular, lightweight electric wires and cables that are up to 20 A in capacity, but the work can be applicable to much larger capacity conductors (for large power transport) as well as much smaller capacity, for electronics applications. For the Air force needs, the key aspects are in size and weight reductions in the final aircraft, leading to fuel saving and efficiency. The other commercial applications are electrical wiring for the Power Industry (transformers, fault current limiters, generators, and motors), and Transportation (ships, trains, and automobiles).
Agency: Department of Health and Human Services | Branch: National Institutes of Health | Program: SBIR | Phase: Phase II | Award Amount: 500.96K | Year: 2015
DESCRIPTION provided by applicant For tesla full body MRI bore magnet systems NbTi superconductor wire has reached its limit at K Above T if NbTi is used it requires super cooling of helium to K to achieve T bore MRI and NMR systems All these T full body MRI background magnets sold by Siemens Philips and GE have been manufactured by Aligent formerly known at Varian before that Magnex Aligent recently announced that they will no longer accept orders for these T magnets and sited costs and availability of helium Some MRI manufacturers have stopped accepting new order for T MRIs because of delivery issues and helium shortages The medical community would like to see T MRIandapos s become a clinical system Hence the price needs to come down dramatically and in the long run the only real solution is to have conduction cooled magnets to take the helium shortage issue out of the equation Nb Sn superconductor wire is the ideal candidate for these applications due to its higher current density at higher field like T Plus the transition temperature Tc is higher K for Nb Sn vs K for NbTi When a large NbTi magnet is cooled in a liquid helium bath the temperature differential in the coil needs to be less than K At K Nb Sn still retains over its engineering current density to enable the design of T magnetic fields in the bore of large magnets and it provides the K margin to enable conduction cooling and can eliminate the need for liquid helium bath cooling This eliminates the need for liters of helium every time the magnet needs to be cooled down training the magnet in the factory setting up the magnet at the hospital and when the magnet quenches several times over its useful life cycle of years What enables our specific aim of large conduction cooled Nb Sn magnets for medical applications is that Hyper Tech has developed a low cost and high performance tube type Nb Sn superconductor which is an excellent wire candidate to open up this market With the increase in performance it can economically enable conduction cooled magnets and eliminate the helium batch cooling This new Hyper Tech lower cost high performance Jc of A mm at K T Nb Sn superconductor wire could cut the wire cost compared to NbTi wire for a Tesla full body MRI It would dramatically decrease the magnet weight and size It will also make the conduction cooling possible for the K range During this Fast Track Phase I and Phase II project we will demonstrate that a new low cost Nb Sn superconductor developed by Hyper Tech can be used to fabricate large conduction cooled cm bore coils for T tesla MRI and NMR systems This will benefit the public for MRI and NMR applications that require high resolution and rapid imaging This matches NIHandapos s mission of delivering cost effective improved health care to the public PUBLIC HEALTH RELEVANCE Hyper Tech will conduct research and development on conduction cooled large bore T plus Nb Sn superconducting magnets for MRI NMR and Medical Particle Accelerators The development of these large conduction cooled magnets will enable these markets to avoid the predicted helium shortage by eliminating helium bath cooling for these magnets In addition the magnet systems will lower cost be safer and less prone to quenching than presently used NbTi or Nb Sn helium bath cooled superconducting magnet systems