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Publications (8)8.62 Total impact

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    ABSTRACT: This paper describes the conceptual design of a high temperature superconducting (HTS) generator for mobile radar (MR) applications. The power system for MR consists of a diesel engine, a generator and power conditioning electronics. Significant improvements in power density, performance and system efficiency result if the generator and the power electronics are cryogenically cooled. The generator supplies power to the radar and the auxiliaries of the system. The generator output required is less than 50 volt AC (RMS phase to neutral) to maximize the efficiency of the cryogenically cooled power electronics. The auxiliaries of the system consume power at 120 V AC, 3-phase, at 60 Hz. The generator is designed to meet both requirements. The diesel engine provides the prime power to the generator at 1800 RPM. The generator is a four-pole two stator winding machine supplying power at 50 V AC, 60 Hz, 12-phase to the power electronics, and 120 V AC, 60 Hz, 3-phase to the auxiliaries of the system. The field winding of the generator consists of HTS coils; the stator has two ambient temperature air gap windings. The cooling of the field winding is provided by heat exchange with helium gas cooled by a Gifford McMahon cryocooler
    IEEE Transactions on Applied Superconductivity 07/1999; · 1.20 Impact Factor
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    ABSTRACT: The Navy SMES background coil was made by stacking 18 double pancakes and connecting them in series to form a superconducting magnet capable of storing 48 MJ of energy. Each double pancake was wound starting in the middle of the conductor and winding outward for each layer. Insulators were placed between each pancake layer which were also used for lifting support. Instruments for the coil protection system control and magnetic field monitoring were attached after final assembly
    IEEE Transactions on Applied Superconductivity 07/1999; · 1.20 Impact Factor
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    ABSTRACT: Improved superconductors for SMES devices will be developed and tested in the Navy SMES cable development program. To test these improved SMES cables, Westinghouse Science and Technology Center is constructing a background field coil for the SMES cable test apparatus that will provide a magnetic field of up to 4 T on a 1.8 meter diameter test specimen. The background coil superconductor design operating point is determined by stability considerations and the superconductor critical surface. Stability ventilated, cabled superconductor proposed background field magnet is reviewed in terms of cryostability, current redistribution, and enthalpy stabilization of surrounding liquid helium
    IEEE Transactions on Applied Superconductivity 07/1997; · 1.20 Impact Factor
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    ABSTRACT: The design and construction of a background coil being built by Westinghouse STC for the Navy SMES cable test apparatus are presented. One objective of the Navy SMES development program is to develop and test improved superconductors for SMES use. The background coil generates a 4 Tesla field on a 1.85 meter diameter SMES conductor sample. The coil stores 49.4 MJ, and has an inner diameter of 2.13 meters. The background coil and SMES conductor sample are housed in separate, concentric cryostats so that the SMES conductor samples can be changed without warming the background coil. The background coil is a pancake style winding, utilizing a Rutherford cable conductor cowound with a stainless steel strap and mylar insulation
    IEEE Transactions on Applied Superconductivity 07/1997; · 1.20 Impact Factor
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    ABSTRACT: A joint in the superconductor and stabilizer is added to the ETM conductor in the POPE. The joint design is similar to that proposed by Westinghouse for the SMES ETM field joints. Fabrication of the joint is described. Measurements on the performance of the superconducting joint operated in subcooled He II and of the stabilizer joint at 14 K are reported. Measured superconductor joint resistance is 1.6 nΩ, which agrees with previous analytic calculations. The stabilizer joint RR matches the conductor stabilizer RR. The joint met or exceeded all operational requirements throughout the experiment demonstrating its reliability and small joule heating.
    IEEE Transactions on Applied Superconductivity 07/1995; · 1.20 Impact Factor
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    ABSTRACT: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
    IEEE Transactions on Applied Superconductivity 01/1995; · 1.20 Impact Factor
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    ABSTRACT: A proof-of-principle experiment (POPE) has been conducted to demonstrate the stability and operation of the superconducting magnetic energy storage (SMES) conductor in an engineering test model (ETM) design. The experimental facility includes: a 100-kA DC power supply; a 4-T, 1-m bore, background field split solenoid: a three-turn-1-m-diameter test coil for the ETM conductor; a dewar for operation of the solenoid and test coil, at 1.8 K and 1 atm; and support systems for vacuum, helium supply and recovery, and data acquisition. The test facility exactly duplicates the electric, magnetic, and thermal conditions expected for the ETM conductor. A report is presented on measurements of conductor stability vs. transport current, applied magnetic field, and cooling from liquid helium. The measurements characterize the conductor's stability against finite-length traveling normal zones and against quenches resulting from transient normal zones. The data qualify the conductor for dependable use at 50 kA, 4 T, and 1.8 K
    IEEE Transactions on Magnetics 04/1991; · 1.42 Impact Factor
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    ABSTRACT: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
    01/1991;