High-T/sub c/ coated conductors-performance of meter-long YBCO/IBAD flexible tapes

Foltyn, S. R.; Arendt, P. N.; Dowden, P. C.; DePaula, R.F.; Groves, J. R.; Coulter, J. Y.; Jia, Q. X.; Maley, M. P.; Peterson, D. E.

doi:10.1109/77.784682

Cited by 148 publications

(48 citation statements)

References 6 publications

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“…I m p r o v e m e n t s i n l o n g -l e n g t h superconductor performance of YBCO coated conductors have been taking place over the last several years. [9] Figure 2 shows this progress as a function of tape length and time. Many factors go into this enhanced performance; these include those related to substrate preparation, polishing, and cleaning; the improvements discussed above to the IBAD process; more careful monitoring and control of the substrate temperature during YBCO deposition; and changes to the Ag overcoating and oxygen annealing process.…”

Section: Resultsmentioning

confidence: 99%

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Advances in YBCO-coated conductor technology

Willis

Arendt

Foltyn

et al. 2000

Physica C: Superconductivity

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Processes for producing both the YSZ template film by IBAD and the YBCO superconducting film by PLD at 1 m lengths have achieved I c values of 122 A and J c values of 1 MA/cm 2 . Improvements have been made in all stages of the process. Variations of I c along the length of the 1-m samples stimulated development of a new in-field I c measurement capability. The use of MgO as an IBAD template film has made great progress and can potentially decrease the time to produce the template film by more than an order of magnitude. A combination of electrical and microstructural investigations are being made to understand and improve the properties of the YBCO coated conductors.

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Section: Resultsmentioning

confidence: 99%

“…[9] Short (<5 cm) samples are made with the substrate attached directly to a heater. The PLD system for the 115-cm long tapes uses a loop system with two rollers, with one of them serving as the tape heater.…”

Section: Methodsmentioning

confidence: 99%

Advances in YBCO-coated conductor technology

Willis

Arendt

Foltyn

et al. 2000

Physica C: Superconductivity

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“…T HE REALIZATION of high critical current in YBCO coated conductors (CCs) has opened the door for high power applications [1]- [4]. In AC applications such as generators, AC loss is a problem due to the large aspect ratio in CCs.…”

Section: Introductionmentioning

confidence: 99%

The Distribution of Transport Current in YBCO Coated Conductor With Zipper Striations

Wang

Selby

Khanal

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, ABSTRACTAn YBCO coated conductor with a zipper pattern striation is investigated by scanning laser microscopy (SLM). The distribution of transport current deduced from the VTSLM images shows that striations act as artificial barriers forcing the current to flow around them. Current sharing and redistribution are observed at the zipper area. We find the major dissipation mechanism in the sample in the superconducting state to be the current crowding at bottleneck areas. The bottleneck seems to be caused by the disabled filaments at and around the zipper area. Some filaments show the dissipation away from the zipper area. In general, we find that the lower J. areas have lower Tc and high EiVm, which we consider as a sign of the current crowding. For the first time, we have demonstrated that there is a high temperature signature of the lower J e (high dissipation) area and VTSLM can detect the signature. SUBJECT TERMSCritical current density, the distribution of transport current, YBCO coated conductor, zipper striations SECURITY CLASSIFICATION OF: 17. LIMITATION NUMBER OF PAGES 1019a. NAME OF RESPONSIBLE PERSON (monitor) Paul N. Barnes Index Terms-Critical current density, the distribution of transport current, YBCO coated conductor, zipper striations.

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“…YBa 2 Cu 3 O 7 coated conductors prepared by conventional thin film vacuum deposition processes like IBAD [2] do not satisfy price criteria. Moreover, the preparation of YBa 2 Cu 3 O 7 coated conductors implies to take into account the weaklink nature of poly-crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

YBa2Cu3O7 tapes prepared by sol–gel deposition techniques: microstructure and structural characterizations

Marguillier

Cloots

Rulmont

et al. 2002

Physica C: Superconductivity

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We report on the preparation conditions of YBa 2 Cu 3 O 7 polycrystalline superconducting tapes by a sol-gel deposition technique. We present some discussion on the compatibility between the nature of the substrate, the use of a buffer layer, and the conditions used to prepare appropriate superconducting YBa 2 Cu 3 O 7 materials. We report also on the micro structural characterizations performed in order to evaluate the crystallites size, degree of orientation and connectivity.

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High-T/sub c/ coated conductors-performance of meter-long YBCO/IBAD flexible tapes

Cited by 148 publications

References 6 publications

Advances in YBCO-coated conductor technology

Advances in YBCO-coated conductor technology

The Distribution of Transport Current in YBCO Coated Conductor With Zipper Striations

YBa2Cu3O7 tapes prepared by sol–gel deposition techniques: microstructure and structural characterizations

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