Compact, lightweight, superconducting power generators

Barnes, Paul N.; Rhoads, Gregory L.; Tolliver, J. C.; Sumption, M.D.; Schmaeman, K.W.

doi:10.1109/tmag.2004.838984

Cited by 59 publications

(24 citation statements)

References 15 publications

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“…As such, Y123 has great promise as a second generation high temperature superconducting (HTS) wire for use in generators and motors as well as in other important electrical devices [4]- [6]. However, when magnetic fields are applied parallel to the c-axis, tends to decrease one to two orders of magnitude when fields of between 1 T and 5 T are applied [7], [8].…”

Section: Subject Termsmentioning

confidence: 99%

Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Kell

Haugan

Locke

et al. 2005

IEEE Trans. Appl. Supercond.

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this bu den estimate or any other aspect of this collection of information, including suggestions for reducing this burden, This is a work of the U.S. Government and is not subject to copyright protection in the United States. ABSTRACTTo evaluate possible flux pinning enhancement in YBa2Cu30 7, (Y123) films due to partial rare-earth ion substitutions, Ce and Tb doping are studied. Bulk ceramic targets of varying compositions (YI,RE.Ba2Cu307,) were made with several doping levels (x = 0 001 to 0.1, RE = Ce or Tb) by using regular solid-state reaction and sintering procedures. These targets were used to deposit Ce and Tb doped YBCO films onto SrTiO 3 single crystal substrates by pulsed laser ablation. Doped YBCO films were characterized for Tc, magnetic field dependence of J c (at 77 K), microstructure, and other properties. The results are compared to undoped YBCO films processed in similar manner. SUBJECT TERMSHigh-temperature superconductors, magnetic field measurement, superconducting materials, thin films Index Terms-High-temperature superconductors, magnetic field measurement, superconducting materials, thin films.

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Section: Subject Termsmentioning

confidence: 99%

Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Kell

Haugan

Locke

et al. 2005

IEEE Trans. Appl. Supercond.

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“…Replacement of copper wires with superconductors can result in substantial reductions in the size and weight of high power transformers, motors and generators [1][2][3][4]. The maximum benefit of such reduction can potentially be achieved in a fully superconducting (all-cryogenic) machine where both stator and rotor windings are superconducting.…”

Section: Introductionmentioning

confidence: 99%

Magnetization losses in multiply connected YBa2Cu3O6+x-coated conductors

Levin

Barnes

Amemiya

et al. 2005

Journal of Applied Physics

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Abstract.We report the results of a magnetization losses study in experimental multifilament, multiply connected coated superconductors exposed to time-varying magnetic field. In these samples, the superconducting layer is divided into parallel stripes segregated by non-superconducting grooves. In order to facilitate the current sharing between the stripes and thus increase the reliability of the striated conductors, a sparse network of superconducting bridges is superimposed on the striated film. We find that the presence of the bridges does not substantially increase the magnetization losses, both hysteresis and coupling, as long as the number of bridges per length of the sample is not large. These results indicate that it is possible to find a reasonable compromise between the competing requirements of connectivity and loss reduction in an ac-tolerant version of the high temperature coated conductors specifically designed for ac power applications.

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“…YBCO has excellent properties at 77 K including high due to strong flux pinning. However it is of interest to increase even further to increase wire performance and reduce production costs [1], [2]. For type-II superconductors, it is known that flux pinning can be increased by incorporating a high density of extended nonsuperconducting defects into the material [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

Addition of alternate phase nanoparticle dispersions to enhance flux pinning of Y-Ba-Cu-O thin films

Haugan

Barnes

Campbell

et al. 2005

IEEE Trans. Appl. Supercond.

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this bu den estimate or any other aspect of this collection of information, including suggestions for reducing this burden, This is a work of the U.S. Government and is not subject to copyright protection in the United States. ABSTRACTNanoparticle dispersions of various phases were added to YBa2Cu307, (YBCO or 123) thin films by multilayer pulsed laser deposition, to determine their effect on flux pinning. The different pinning materials examined include Y2BaCu05 (Y211 or green-phase), La2BaCu05 (La211 or brown-phase),Y 203, Ce02, and MgO, with lattice constant mismatches varying from 0.5% to 12% with respect to YBCO. Y211 and Y203 provided significant pinning increases at temperatures of 65 K and 77 K, however other phases provided enhancements only at 65 K (for Ce0 2 and La211) for limited range of applied field strengths. An interesting correlation between T e transition widths and pinning strengths was observed. The additions produced markedly different nanoparticle and film microstructures,as well as superconducting properties. SUBJECT TERMS

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Compact, lightweight, superconducting power generators

Cited by 59 publications

References 15 publications

Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Magnetization losses in multiply connected YBa2Cu3O6+x-coated conductors

Addition of alternate phase nanoparticle dispersions to enhance flux pinning of Y-Ba-Cu-O thin films

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