Hysteretic loss reduction in striated YBCO

Cobb, C.B.; Barnes, Paul N.; Haugan, Timothy J.; Tolliver, J. C.; Lee, Eungkuk; Sumption, M.D.; Collings, E. W.; Oberly, C. E.

doi:10.1016/s0921-4534(02)01196-6

Cited by 94 publications

(75 citation statements)

References 9 publications

(12 reference statements)

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“…9 In this case, where the width of the filaments are one-seventh the width of the sample, the maximum loss reduction will be one-seventh. However, as evidenced from the given M-H loops, slightly less loss reduction is observed.…”

Section: Resultsmentioning

confidence: 99%

“…A way to reduce these losses is to filamentize (striate) the HTS layer. 9,15,16 These superconducting filaments must be "sufficiently" separated along the entire length of the HTS conductor. Fundamentally, this requirement amounts to a limitation on the amount of possible current flow per unit length between the filaments; practically, this means that the interfilamentary regions can be fully insulating, resistive, or even very weakly superconducting.…”

Section: A)mentioning

confidence: 99%

“…[6][7][8] Because of this success, the large effort given to the basic architecture of the YBCO coated conductor must begin to be also applied to issues such as ac loss, stability, and magneticflux pinning. [9][10][11][12] The minimization of ac losses is especially critical for the coated conductors, which, being highly aspected, have the potential for high losses in certain applications.…”

Section: Introductionmentioning

confidence: 99%

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Low loss striated YBa2Cu3O7−d coated conductor with filamentary current sharing

Barnes

Sumption

2004

Journal of Applied Physics

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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, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. This work is copyrighted. One or more of the authors is a U.S. Government employee working within the scope of their Government job; therefore, the U.S. Government is joint owner of the work and has the right to copy, distribute, and use the work. All other rights are reserved by the copyright owner. REPORT DATE (DD-MM-YY) AFRL-PR-WP-TP-2006-214 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Propulsion ABSTRACTA simple investigation into the properties of weakly linked filaments in striated YBa2Cu307_d (YBCO) coated conductors has been performed. Such weak-link connections may arise in two different contexts within the coated conductors, the one case being the occurrence of unintentional connections. However, it may be desirable to intentionally induce the weak-link connections in order to allow a current sharing between the filaments. This allows the localized degradation of a given filament to be circumvented at a small cost in terms of the added losses and magnetization. This problem has been treated mathematically with a comparison of the superconductor weak linking in contrast to the normal-metal-induced current sharing. The estimates for target values of filament coupling are deduced, and the results in terms of magnetization are then determined. The YBCO samples created, using the pulsed laser deposition, are described that have these properties. The samples consist of one control and one striated sample. The magnetization response of these samples is then considered in terms of the expressions developed. SUBJECT TERMSAC losses, current sharing, YBCO coated conductor A simple investigation into the properties of weakly linked filaments in striated YBa 2 Cu 3 O 7−d (YBCO) coated conductors has been performed. Such weak-link connections may arise in two different contexts within the coated conductors, the one case being the occurrence of unintentional connections. However, it may be desirable to intentionally induce the weak-link connections in order to allow a current sharing between the filaments. This allows the localized degradation of a given filament to be circu...

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Section: Resultsmentioning

confidence: 99%

Section: A)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low loss striated YBa2Cu3O7−d coated conductor with filamentary current sharing

Barnes

Sumption

2004

Journal of Applied Physics

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“…These conductors can be wound as coils and, when used in motors and generators instead of copper wires, they can reduce the total size and weight of the device because of their ability to carry high currents without resistance. Yet, these coated conductors produce large losses when used with alternating current (AC) or fields [6][7][8][9]. The high aspect ratio of the coated conductor geometry leads to high hysteresis losses proportional to the width of the superconducting film.…”

Section: Introductionmentioning

confidence: 99%

“…This filamentary superconducting structure can be accomplished through several techniques which can be divided into two main approaches: with or without material removal. Lithography, wet chemical etching, ion beam etching, laser ablation or slitting of the tape are techniques where superconducting material is removed [7,8,12,[19][20][21]. They have a variety of disadvantages such as high cost, local degradation of the superconducting properties or tape fragmentation.…”

Section: Introductionmentioning

confidence: 99%

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

et al. 2013

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In this paper, we present ink-jet printing as an attractive alternative to lithography and etching methods for the development of multi-filamentary YBa 2 Cu 3 O 7-δ coated conductors. Our research is mainly focused on the study of the influence of rheological parameters on the printability of water-based inks in order to produce superconducting patterns on SrTiO 3 and CeO 2 -La 2 Zr 2 O 7 -Ni5at%W substrates. An aqueous YBCO precursor ink with a total metal ion concentration of 1.1 mol/L with a viscosity of 6.79 mPa s and a surface tension of 67.9 mN/m is developed. Its printing behavior using several ink-jet printing devices is verified using a camera with strobed illumination to quantify droplet velocity and volume. After optimization of the deposition parameters, YBCO tracks with different dimensions could be printed on both types of substrates. Their shape and dimensions were determined using optical microscopy and noncontact profilometry, showing 100-200 nm thick and 40-200 µm wide tracks. Finally, resistivity measurements were performed on the widest tracks on SrTiO 3 showing a clear drop in the resistivity starting from 88.6 K with a ∆T c of 1.4 K.

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