Engineered Pinning Landscapes for Enhanced 2G Coil Wire

Rupich, M.W.; Sathyamurthy, S.; Fleshler, S.; Li, Qiang; Solovyov, Vyacheslav; Ozaki, Toshinori; Welp, U.; Kwok, W. K.; Leroux, Maxime; Koshelev, A. E.; Miller, Dean J.; Kihlstrom, Karen; Civale, L.; Eley, Serena; Kayani, A.

doi:10.1109/tasc.2016.2542270

Cited by 48 publications

(42 citation statements)

References 17 publications

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“…3). 2D modeling predicts faster demagnetization rate by33,35, and 39 % for 50, 100, and 150 mT ripple field amplitudes, respectively, as calculated for the 20th cycle.…”

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confidence: 78%

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Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka¹,

Pardo

Grilli³

et al. 2019

Supercond. Sci. Technol.

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Stacks of superconducting tapes can trap much higher magnetic fields than conventional magnets. This makes them very promising for motors and generators.However, ripple magnetic fields in these machines present a cross-field component that demagnetizes the stacks. At present, there is no quantitative agreement between measurements and modeling of cross-field demagnetization, mainly due to the need of a 3D model that takes the end effects and real micron-thick superconducting layer into account. This article presents 3D modeling and measurements of cross-field demagnetization in stacks of up to 5 tapes and initial magnetization modeling of stacks of up to 15 tapes. 3D modeling of the cross-field demagnetization explicitly shows that the critical current density, J c , in the direction perpendicular to the tape surface does not play a role in cross-field demagnetization. When taking the measured anisotropic magnetic field dependence of J c into account, 3D calculations agree with measurements with less than 4 % deviation, while the error of 2D modeling is much higher. Then, our 3D numerical methods can realistically predict cross-field demaga This article has been published in Supercond. Sci. Technol. with netization. Due to the force-free configuration of part of the current density, J, in the stack, better agreement with experiments will probably require measuring the J c anisotropy for the whole solid angle range, including J parallel to the magnetic field.the probe is at least 10 mV/T. Cross-field demagnetization consists on the following three main steps: magnetization by field cooling (FC) method, relaxation time and cross-field demagnetization. The detailed process is the following:• The sample is placed into the electromagnet at room temperature.• The electromagnet is ramped up to 1 T.• The sample is cooled down in liquid nitrogen bath at 77 K.• The electromagnet is ramped down with ramp rate 10 mT/s. 400 405 410 415 420 425 B t /B 0 [-] t [s] cal 50 mT cal 100 mT cal 150 mT cal 50 mT n(B,θ) cal 100 mT n(B,θ) cal 150 mT n(B,θ) (b) FIG. 19: (a) The n(B, θ) measured data on a 4 mm wide SuperOx tape, measured in Bratislava by the set-up in [46]. (b) The comparison of calculation with constant n=30 and n(B, θ) dependence, both cases use J c (B, θ) dependence. Using n(B, θ) slightly reduces the demagnetization rate for a few number of cycles, but later on it is increased slightly.

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“…3). 2D modeling predicts faster demagnetization rate by33,35, and 39 % for 50, 100, and 150 mT ripple field amplitudes, respectively, as calculated for the 20th cycle.…”

mentioning

confidence: 78%

“…Their Hastelloy substrate enhances mechanical properties. Also, the stack lenght is virtually unlimited with very uniform J c , and the stack width could be as wide as 46 mm [3]. Larger continuous superconducting shapes result in larger trapped flux for the same maximum trapped field.…”

Section: Introductionmentioning

confidence: 99%

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka¹,

Pardo

Grilli³

et al. 2019

Supercond. Sci. Technol.

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“…These defects produced by ion irradiation would account for the depression of T c in YBa 2 Cu 3 O y (YBCO), which is proportional to the average number of defects23. Recently, a low-energy ion irradiation has been revisited and suggested as a practically feasible approach to improve flux pinning in YBCO242526. In single crystals of iron-based superconductors, it has been found that ion irradiations, as a whole, improve J c and its J c enhancements persist up to much higher fluencies than in cuprate superconductors, although T c is suppressed with increasing irradiation doses272829.…”

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confidence: 99%

A route for a strong increase of critical current in nanostrained iron-based superconductors

et al. 2016

Self Cite

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The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both Tc and Jc together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. Tc is enhanced due to the nanoscale compressive strain and proximity effect, whereas Jc is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of Jc enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.

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“…The initial increase of S(T) corresponds to an Anderson-Kim like creep with S≈T/U, where U is the activation energy (approximately Tindependent at low T). The IRR0 displays a peak at T≈20 K, usually attributed to correlated disorder (such as twin boundaries) [9], but which also can be attributed to changes in the strong pinning regimes for nanoparticles [18]. Above the peak, the S(T) relaxation displays a minimum which is usually attributed to glassy relaxation with values determined by the vortex bundle size.…”

Section: Resultsmentioning

confidence: 99%

In-field dependences of the critical current density J in GdBa2Cu3O7-d coated conductors produced by Zr irradiation and post-annealing at low temperatures

Haberkorn

Suárez

Lee³

et al. 2019

Solid State Communications

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We report the influence of 6 MeV Zr 4+ irradiation and post-irradiation annealing (200 °C) in the in-field dependences of the critical current densities J c of 1.3 thick GdBa 2 Cu 3 O 7-d coated conductors grown by co-evaporation. Samples were irradiated with 6 MeV Zr 4+ and fluences between 2.3x10 11 cm -2 and 3x10 12 cm -2 . The correlation between the superconducting critical temperature T c and in-field dependences of critical current densities J c has been analyzed. In addition, random disorder introduced by irradiation was reduced by thermal annealed at 200 °C.The analysis of our experimental findings indicates that the optimal irradiation (reducing random disorder by annealing) results in the suppression of the self-field J c of ≈ 10 % and in-field J c enhancements nearly doubled at about 5 T. A clear correlation between T c , disorder and self-field J c is observed. Additional random disorder and nanoclusters suppress systematically T c and increase the flux creep relaxation at intermediate temperatures (reducing the characteristic glassy µ value).c c T T J for the samples indicated in the panel at µ 0 H = 0.1 T.

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Engineered Pinning Landscapes for Enhanced 2G Coil Wire

Cited by 48 publications

References 17 publications

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

A route for a strong increase of critical current in nanostrained iron-based superconductors

In-field dependences of the critical current density J in GdBa2Cu3O7-d coated conductors produced by Zr irradiation and post-annealing at low temperatures

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