Second Generation HTS Wire Based on RABiTS Substrates and MOD YBCO

Schoop, U.; Rupich, M.W.; Thieme, C.L.H.; Verebelyi, D. T.; Zhang, W.; Li, X.; Kodenkandath, T.; Nguyen, Nguyet Minh; Siegal, E.; Civale, L.; Holesinger, T. G.; Maiorov, B.; Goyal, A.; Paranthaman, M.

doi:10.1109/tasc.2005.847681

Cited by 100 publications

(100 citation statements)

References 14 publications

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“…However, two of the main companies leading the development of coated superconductors (American Superconductor and SuperPower) have opted for a different type of stabilizer -surround stabilizer, shown in Fig. 2(b) [2,3]. Among the advantages of this architecture is that copper encapsulates and protects the YBCO film and the substrate.…”

Section: Coated Conductor Stabilizermentioning

confidence: 99%

Current sharing between superconducting film and normal metal

Levin

Barnes

Bulmer

2007

Supercond. Sci. Technol.

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A two-dimensional model is introduced that describes current sharing between the superconducting and normal metal layers in configuration typical of YBCO-coated conductors. The model is used to compare the effectiveness of surround stabilizer and more conventional one-sided stabilizer. When the resistance of the interface between the superconductor and stabilizer is low enough, the surround stabilizer is less effective than the one-sided stabilizer in stabilizing a hairline crack in the superconducting film.

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Section: Coated Conductor Stabilizermentioning

confidence: 99%

Current sharing between superconducting film and normal metal

Levin

Barnes

Bulmer

2007

Supercond. Sci. Technol.

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“…The architecture of coated conductors can be described as a "sandwich" in which the Y Ba 2 Cu 3 O 7−x (YBCO) superconducting film of about 1µm thick is enclosed between a buffered metal substrate of relatively high resistivity (N i − 5%W alloy, Hastelloy, or stainless steel) and a copper stabilizer layer [1,2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

The normal zone in YBa₂Cu₃O_6+x-coated conductors

Levin

Barnes

2007

Supercond. Sci. Technol.

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We consider the distribution of an electric field in YBCO-coated conductors for a situation in which the DC transport current is forced into the copper stabilizer due to a weak link -a section of the superconducting film with a critical current less than the transport current. The electric field in the metal substrate is also discussed. The results are compared with recent experiments on normal zone propagation in coated conductors for which the substrate and stabilizer are insulated from each other. The potential difference between the substrate and stabilizer, and the electric field in the substrate outside the normal zone can be accounted for by a large screening length in the substrate, comparable to the length of the sample. During a quench, the electric field inside the interface between YBCO and stabilizer, as well as in the buffer layer, can be several orders of magnitude greater than the longitudinal macroscopic electric field inside the normal zone. We speculate on the possibility of using possible microscopic electric discharges caused by this large (∼kV/cm) electric field as a means to detect a quench.

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“…Thus Ohmic heating should be minimized through design of the sample holder and procedures should be implemented to remove the trapped helium gas. J e (B) curves that are distorted for magnetic field above about 20 T occur in the absence of such measures [26]. 2.…”

Section: Procedures For Short Sample Measurements In High Magnetic Fieldmentioning

confidence: 99%

“…However, funding of ReBCO conductor development is mostly driven by applications in the power industry, which lead to a focus on applications at or some 10-30 K below 77 K and in AC applications. Conductor availability has been limited and relatively little systematic work relating to ReBCO conductor and coil characteristics at 4.2 K is published, despite inspiring results from the few small coils that were built and tested at 4.2 K [26,27,28]. ReBCO conductors are considered in this work as their availability allowed.…”

Section: Figure 1-4 Engineering Critical Current Density In Hts and mentioning

confidence: 99%

“…The margin between design stress and the onset of degradation in the 5T coil is not exactly known but is expected to be in the range from zero to 20%. 26 Thus the delay should be as short as practical as no value above zero is safe with the insert at design current and the LBRM at 20 T. A delay above 40 ms is likely to result in strain induced degradation of the critical current density. The time delay from the onset of an LBRM trip to discharge of the insert over the dump resistor is approximately 10 ms for the protection system as implemented and limits the stress increase in the insert to 3-4% of the stress at the moment of the resistive magnet discharge.…”

Section: ____________________________________________________________mentioning

confidence: 99%

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High-temperature superconductors in high-field magnets

Weijers

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Preface and acknowledgementThis thesis deals with selected topics out of a wide research and development effort on HTS insert coil technology. Its origin goes back to the founding charter of the NHMFL in the year 1988 which listed the goal of realizing a 25 T superconducting magnet as one of the milestones the NHMFL was to achieve. High-temperature superconductors had only just been discovered and the required technology was non-existent. The path to where we are now has been eventful and a real learning experience. From the early days in the mid-1990-ies of the 'Wind and Pray" approach when coil testing relentlessly pointed out the shortcomings of both conductor and coil technologies at the time to the first successful "mini-coils" (around coil number 70) to the successive 1 T, 3 T and 5 T inserts (the latter reaching 25 T and bringing the total of numbered coils over 300 a decade later) to the promise of 30 + T superconducting user magnets with coated conductors in the not-toodistant future.Lacking the funds to buy the very expensive conductors, a collaboration was established with industry. This approach has served us well and resulted in a wide assortment of conductors to work with. New superconductors were donated in exchange for feedback on its performance as observed in our magnet technology development program. We also tested complete coils built by ourselves or by partners, in background magnetic field, a task for which the NHMFL facilities are well suited.This work is centered on the 5T insert coil for a total magnetic field of 25 T, but the research and development effort is interwoven with and inseparable from the broader HTS insert coil technology development program. Therefore discussions on a wider range of conductors and coils in line with the broader scope of this thesis are presented.While I take full responsibility for the described NHMFL insert coil designs, analysis and interpretation of the data on coils and conductors, having executed or been directly involved with all experiments described and having wound many a coil, this work has had the benefit of many direct and indirect contributions of a large number of people inside and outside the NHMFL. In contrast, developing this thesis itself has been the loneliest work I have ever done, but ultimately just as rewarding. There are many people that I would like to thank for their contributions to the HTS insert program in general and this thesis in particular.

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Second Generation HTS Wire Based on RABiTS Substrates and MOD YBCO

Cited by 100 publications

References 14 publications

Current sharing between superconducting film and normal metal

Current sharing between superconducting film and normal metal

The normal zone in YBa₂Cu₃O_6+x-coated conductors

High-temperature superconductors in high-field magnets

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Second Generation HTS Wire Based on RABiTS Substrates and MOD YBCO

Cited by 100 publications

References 14 publications

Current sharing between superconducting film and normal metal

Current sharing between superconducting film and normal metal

The normal zone in YBa2Cu3O6+x-coated conductors

High-temperature superconductors in high-field magnets

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The normal zone in YBa₂Cu₃O_6+x-coated conductors