Effects on Jc of pinning center morphology for multiple-in-line-damage in coated conductor and bulk, melt-textured HTS

Weinstein, R.; Parks, D.; Sawh, Ravi‐Persad; Mayes, B.; Gandini, A.; Goyal, A.; Chen, Y.; Selvamanickam, V.

doi:10.1016/j.physc.2009.08.015

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…Heavy-ion irradiation with low fluences [5] is a potential way to improve further the critical current density by creating extra pinning centers with controlled diameters, direction and continuity [6]. In our previous work on the silver coated YBa 2 Cu 3 O 7-x superconducting film deposited on a buffer and Hastelloy, we found that irradiation with MeV Kr 17+ (∼2⋅10 and ∼6⋅10 cm -2 fluences) increased the critical current by 5%, while the transition temperature remained the same as for non-irradiated samples (90 K), and the adhesion at the Hastelloy / buffer interface improved significantly [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Kr and Xe ion irradiation on the structure of Y₂O₃ nanoprecipitates in YBCO thin film conductors

Suvorova

Уваров

Овчаров

et al. 2018

Philosophical Magazine

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The response of Y 2 O 3 nanoprecipitates in a 1-µm YBa 2 Cu 3 O 7-x layer from a superconducting wire Ag/YBCO/buffer metal oxides/Hastelloy to 107 MeV Kr and 167 MeV Xe ion irradiation was investigated using a combination of transmission electron microscopy, diffraction and X-ray energy dispersive spectrometry. The direct observation of the radiation induced tracks in Y 2 O 3 nanocrystals is reported for the first time to the best authors' knowledge. Structureless damaged regions of 5-9 nm (average 8 nm) in diameter were observed in Y 2 O 3 nanocrystals when the electronic stopping power S e was about or higher than 4.7 keV/nm. This value of S e is the upper estimate of the minimum electronic stopping power to create damage in yttria nanocrystals. The electron diffraction patterns and HRTEM/HRSTEM Fourier transform patterns from areas extending a few nanometers around the tracks show that yttria and YBCO keep their respective cubic and orthorhombic pristine structures.

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Section: Introductionmentioning

confidence: 99%

Effects of Kr and Xe ion irradiation on the structure of Y₂O₃ nanoprecipitates in YBCO thin film conductors

Suvorova

Уваров

Овчаров

et al. 2018

Philosophical Magazine

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“…The creation of pinning centres (PCs) within large grain HTS was recognized as the key to high-field TFMs in the earliest work [3][4][5], and has been an active research topic since then [6][7][8][9][10][11][12][13][14]. In type II superconductors, field is present within bulk material in the form of magnetic flux quanta.…”

Section: Introductionmentioning

confidence: 99%

“…In the processes of grain production various pinning centres occur naturally, e.g., non-superconducting deposits, HTS grain boundaries, second phases, twin boundaries, etc. Recent developments include near-ideal PCs produced by irradiation with high energy ions [6][7][8], somewhat less ideal PCs somewhat more amenable to industrial processes [9,10], and a variety of non-superconducting chemical precipitates within HTS grains which are even more easily amenable to industrial production [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Measurements of flux pumping activation of trapped field magnets

Weinstein

Parks

Sawh

et al. 2010

Supercond. Sci. Technol.

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Large grains of high temperature superconducting (HTS) material can be utilized as trapped field magnets (TFMs). Persistent currents are set up in the HTS when it is cooled in a magnetic field, or exposed to a magnetic field after cooling. TFMs have been improved over the past two decades by the efforts of a large number of worldwide research groups. However, applications using TFMs have lagged, in part due to the problem of high fields needed for activation. We describe herein experiments designed to observe the behaviour of TFM activation using repeated applications of low fields (called 'pumping'). Significant partial activation is obtained using a non-uniform pumping field (e.g., a small permanent magnet) which is higher in the centre of the HTS than at the periphery. Cooling in zero field followed by pumping with such a field results in trapping the full applied field, in comparison to half of the applied field being trapped by cooling in zero field followed by application of a uniform field. We find that for partial activation by cooling in a field and subsequent activation by pumping, the resulting fields are additive. We also conclude that for activation by fluxoid pumping, creep assists the process.

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“…The J C was found to increase by a factor of over 16 [4]. These samples were later compared to high quality coated conductor improved by a similar ion bombardment [20]. The coated conductor, for which J C was a (then) record, had J C only twice that of the YBCO bulk.…”

Section: Resultsmentioning

confidence: 98%

Production run of 2 cm diameter YBCO trapped field magnets with surface field of 2 T at 77 K

Sawh

Weinstein

Carpenter

et al. 2013

Supercond. Sci. Technol.

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A production run of 60 melt-textured YBCO trapped field magnets (TFMs), 2 cm in diameter, is reported. The TFMs have pinning centers of Y211 and (Pt 0.4 U 0.6 )YBa 3 O 6 deposits and also damage tracks of ions from uranium fission. The resulting average trapped field at the center of the seed-side surface is B T (r = 0) = 2.04 T at 77 K. The rms spread in B T is 5.9%. TFM samples rejected due to problems with the SmBCO seeds totaled ∼10%, and an additional 2% were lost due to cracking under magnetic pressure. Methods to significantly reduce these losses are discussed. The ratio of B T on the TFM bottom to that on the seed side is ∼67%. Evidence of a method to raise this ratio to 1.0 is presented. The magnitude and time dependence of the radioactivity resulting from the uranium fission are reported.

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Effects on Jc of pinning center morphology for multiple-in-line-damage in coated conductor and bulk, melt-textured HTS

Cited by 12 publications

References 20 publications

Effects of Kr and Xe ion irradiation on the structure of Y₂O₃ nanoprecipitates in YBCO thin film conductors

Effects of Kr and Xe ion irradiation on the structure of Y₂O₃ nanoprecipitates in YBCO thin film conductors

Measurements of flux pumping activation of trapped field magnets

Production run of 2 cm diameter YBCO trapped field magnets with surface field of 2 T at 77 K

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Effects on Jc of pinning center morphology for multiple-in-line-damage in coated conductor and bulk, melt-textured HTS

Cited by 12 publications

References 20 publications

Effects of Kr and Xe ion irradiation on the structure of Y2O3 nanoprecipitates in YBCO thin film conductors

Effects of Kr and Xe ion irradiation on the structure of Y2O3 nanoprecipitates in YBCO thin film conductors

Measurements of flux pumping activation of trapped field magnets

Production run of 2 cm diameter YBCO trapped field magnets with surface field of 2 T at 77 K

Contact Info

Product

Resources

About

Effects of Kr and Xe ion irradiation on the structure of Y₂O₃ nanoprecipitates in YBCO thin film conductors

Effects of Kr and Xe ion irradiation on the structure of Y₂O₃ nanoprecipitates in YBCO thin film conductors