Critical current measurements of DI-BSCCO tapes as a function of angle in high magnetic fields

Sunwong, Prapaiwan; Higgins, J. S.; Hampshire, D.P.

doi:10.1088/1742-6596/234/2/022013

Cited by 4 publications

(6 citation statements)

References 25 publications

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“…The main graph in figure 21 suggests that some form of parameterization of the angle dependency is possible, at least for a single temperature of 4.2 K and for fields above 10 T. The data for lower magnetic fields substantially increase the spread in the normalized plot but these data are less relevant for insert-coils that operate in a background magnetic field that is generated by LTS outer coils. Parameterization of the measured data, perhaps using one of the available models in the literature [72, 73, 74, 75] is, however, outside of the scope of the present paper.…”

Section: Discussionmentioning

confidence: 99%

“…One can argue that for a practical high-field insert-coil design the coil-current will be limited by the radial-field components. To establish the current margins in various coil-sections, and more specifically to calculate the behavior of the coil during a quench, however, the angular-(figure 16, [72]) and temperature-dependencies [45] become relevant and it is desirable to establish a parameterization of  I B T , , angle , c ( [ ] ) . Though the criticalcurrent as a function of temperature at insert-coil-relevant high fields (>15 T) is not yet available, it is useful to already investigate the possibility to condense the I B, angle c ( ) data at 4.2K from figure 16 into a form that lends itself for parameterization.…”

Section: Critical-current As a Function Of Magnetic Field And Fieldanglementioning

confidence: 99%

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A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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We performed a feasibility study on a high-strength Bi2−xPbxSr2Ca2Cu3O10−x (Bi-2223) tape conductor for high-field solenoid applications. The investigated conductor, DI-BSCCO Type HT-XX, is a pre-production version of Type HT-NX, which has recently become available from Sumitomo Electric Industries (SEI). It is based on their DI-BSCCO Type H tape, but laminated with a high-strength Ni-alloy. We used stress-strain characterizations, single- and double-bend tests, easy- and hard-way bent coil-turns at various radii, straight and helical samples in up to 31.2 T background field, and small 20-turn coils in up to 17 T background field to systematically determine the electro-mechanical limits in magnet-relevant conditions. In longitudinal tensile tests at 77 K, we found critical stress- and strain-levels of 516 MPa and 0.57%, respectively. In three decidedly different experiments we detected an amplification of the allowable strain with a combination of pure bending and Lorentz loading to ≥ 0.92% (calculated elastically at the outer tape edge). This significant strain level, and the fact that it is multi-filamentary conductor and available in the reacted and insulated state, makes DI-BSCCO HT-NX highly suitable for very high-field solenoids, for which high current densities and therefore high loads are required to retain manageable magnet dimensions.

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Section: Discussionmentioning

confidence: 99%

Section: Critical-current As a Function Of Magnetic Field And Fieldanglementioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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“…Because of the anisotropy of the BSCCO tapes, these curves are given for the perpendicular and the parallel components (to the widest face of the tape) of the flux density. Similarly, the method could be used if the I c (B, Ψ) curve is available, Ψ being the angle between B ⃗ and the c-axis of the HTS tape [15].…”

Section: Operating Current Of the Studied Hts Couplermentioning

confidence: 99%

High temperature superconducting axial field magnetic coupler: realization and test

Belguerras¹,

Mezani²,

Lubin³

et al. 2015

Supercond. Sci. Technol.

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Contactless torque transmission through a large airgap is required in some industrial applications in which hermetic isolation is necessary. This torque transmission usually uses magnetic couplers, whose dimension strongly depends on the airgap flux density. The use of High Temperature Superconducting (HTS) coils to create a strong magnetic field may constitute a solution to reduce the size of the coupler.It is also possible to use this coupler to replace a torque tube in transmitting the torque produced by a HTS motor to its load. This paper presents the detailed construction and tests of an axial field HTS

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“…41 In contrast, the current leads of probes in horizontal magnets are orthogonal to the stray field of the magnet so the forces on them can be large and the torque associated with the large Lorentz force can twist the bottom part of the probe even when the top part of the probe is fixed. The split-current-lead design has been used in our group 42 to minimize the torque as well as the self-field produced at the sample by the sample current. The experimental apparatus is illustrated in Fig.…”

Section: A Split-current-lead Designmentioning

confidence: 99%

“…The current lead that is attached to the bottom of the sample is split into two parts while the other (central) lead attached to the top of the sample remains a single lead. Figures 3 and 4 show the performance of the split-current-lead design we originally used 42 in the J c (B, T, θ ) probe and the split-currentlead design implemented in this work for the J c (B, T, θ , ε) probe. The angular measurements in both probes were performed on DI-BiSCCO tapes at 4.2 K and the data are plotted up to values of current which generated electric fields of 100 μV m −1 across the voltage taps (i.e., where J c is determined).…”

Section: A Split-current-lead Designmentioning

confidence: 99%

Probes for investigating the effect of magnetic field, field orientation, temperature and strain on the critical current density of anisotropic high-temperature superconducting tapes in a split-pair 15 T horizontal magnet

Sunwong

Higgins

Hampshire

2014

Review of Scientific Instruments

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(2014) 'Probes for investigating the eect of magnetic eld, eld orientation, temperature and strain on the critical current density of anisotropic high-temperature superconducting tapes in a split-pair 15 T horizontal magnet.', Review of scientic instruments., 85 (6). 065111.Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We present the designs of probes for making critical current density (J c ) measurements on anisotropic high-temperature superconducting tapes as a function of field, field orientation, temperature and strain in our 40 mm bore, split-pair 15 T horizontal magnet. Emphasis is placed on the design of three components: the vapour-cooled current leads, the variable temperature enclosure, and the springboardshaped bending beam sample holder. The vapour-cooled brass critical-current leads used superconducting tapes and in operation ran hot with a duty cycle (D) of ∼0.2. This work provides formulae for optimising cryogenic consumption and calculating cryogenic boil-off, associated with current leads used to make J c measurements, made by uniformly ramping the current up to a maximum current (I max ) and then reducing the current very quickly to zero. They include consideration of the effects of duty cycle, static helium boil-off from the magnet and Dewar (b ), and the maximum safe temperature for the critical-current leads (T max ). Our optimized critical-current leads have a boil-off that is about 30% less than leads optimized for magnet operation at the same maximum current. Numerical calculations show that the optimum cross-sectional area (A) for each current lead can be parameterized by . A split-current-lead design is employed to minimize the rotation of the probes during the high current measurements in our high-field horizontal magnet. The variable-temperature system is based on the use of an inverted insulating cup that operates above 4.2 K in liquid helium and above 77.4 K in liquid nitrogen, with a stability of ±80 mK to ±150 mK. Uniaxial strains of −1.4% to 1.0% can be applied to the sample, with a total uncertainty of better than ±0.02%, using a modified bending beam apparatus which includes a copper beryllium springboard-shaped sample holder. © 2014 AIP Publishing LLC. [http://dx

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Critical current measurements of DI-BSCCO tapes as a function of angle in high magnetic fields

Cited by 4 publications

References 25 publications

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

High temperature superconducting axial field magnetic coupler: realization and test

Probes for investigating the effect of magnetic field, field orientation, temperature and strain on the critical current density of anisotropic high-temperature superconducting tapes in a split-pair 15 T horizontal magnet

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