Critical current density of Bi-2223/Ag multifilamentary tapes from 4.2 K up to 90 K in magnetic fields up to 23 T

Sneary, A.B.; Friend, C.M.; Vallier, J.C.; Hampshire, D.P.

doi:10.1109/77.785015

Cited by 9 publications

(9 citation statements)

References 10 publications

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“…On the other hand, PIT strands are relatively expensive. Although PIT processing of Nb 3 Sn has been aided by the progress with HTS [19,20] and MgB 2 [21] PIT superconductors, it is still relatively complex and needs further refinement to reduce the amount of expensive unreacted Nb that remains after the heattreatment and to increase the A-15 fraction in the non-Cu area [10]. New tubular approaches are being attempted which may simplify the production process [22] and may yet make these materials more commercially viable.…”

Section: Introductionmentioning

confidence: 99%

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb₃Sn superconducting strand

Lu¹,

Hampshire

2009

Supercond. Sci. Technol.

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We present critical current density (J C) data as a function of magnetic field, temperature (4.2 K T 14 K) and intrinsic strain (ε I) for a high performance powder-in-tube (PIT) Nb 3 Sn strand. Although the critical current density is very high, it is demonstrated that there is no stronger strain sensitivity than for Nb 3 Sn strands of other types and that the reversible strain window encompasses at least −0.60% < ε I < 0.25%. The n-value of the PIT Nb 3 Sn strand, derived from the electric field-current density (E-J) characteristics, is two or three times larger than those of strands made using other production processes. However, the normalized n-index as a function of intrinsic strain still shows a similar behaviour to those for other strands. The relation between the n-index and the critical current is described by the empirical power law of the form n = 1 + r I s C , where r and s are approximately 3 and 0.5 respectively. We conclude that the increase in J C and the n-value for PIT strands is achieved while maintaining good tolerance to strain.

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Section: Introductionmentioning

confidence: 99%

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb₃Sn superconducting strand

Lu¹,

Hampshire

2009

Supercond. Sci. Technol.

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“…[ [25][26][27]. In our measurements, after the initial conditions are set, the direction of the applied field changes due to a twisting of the probe while the critical current measurement is being made.…”

Section: Angle Between Direction Of Magnetic Field and Ab-plane (Degrmentioning

confidence: 99%

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

Sunwong¹,

Higgins²,

Hampshire³

2010

J. Phys.: Conf. Ser.

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Controlled Over-Pressure is used by Sumitomo Electric Industries Ltd. to process so-called DI-BSCCO Bi-2223 superconducting tape reaching high critical current (I C) in high magnetic fields. This paper reports the critical current of DI-BSCCO tape at 77 K in low fields and at 4.2 K in our horizontal split-pair magnet in fields up to 13 T at various angles between the surface of the tape and the direction of the magnetic field. These critical current data are strongly influenced by the anisotropy of Bi-2223, the texturing of the tape and the magnetic history of the magnetic field. The magnetic field and angular dependence of I C at 77 K can be parameterised with a simple anisotropic Kim model. For 4.2 K measurements where large currents and magnetic fields are required, it is demonstrated that a split-current-lead design can be used to reduce rotation of the probe during the I C measurements.

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“…As already mentioned and in fact it is expected, that the high-temperature-superconductor-based micro-SMES devices could operate at temperatures between 20 and 40 K. Unfortunately, our experimental technique enabled us only to make the measurements of I c (B, α) at 4.2, 65 and 77 K. If we wanted to estimate the values of the critical currents/energy for the temperature interval mentioned above, the results of a systematic experimental study of the temperature dependence of the I c (B, α) characteristic and irreversibility field analysis of Bi(2223)Ag tapes performed by Rábara et al [41] and/or Sneary et al [42] could be used. According to their results it can be stated that the values of I c corresponding to a parallel orientation between the field and the broad tape surface (α = 0 • ) increase almost linearly with decreasing temperature in the whole temperature range between 4.2 and 65 K; of course, depending on the value of external field applied (0-5 T).…”

Section: Stored Energymentioning

confidence: 99%

Energy and critical current considerations of Bi(2223)/Ag coils for micro-superconducting magnetic energy storage: influence of operating temperature and winding geometry within the same overall tape length

Pitel

Kòváč

Lehtonen

et al. 2001

Supercond. Sci. Technol.

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A detailed theoretical qualitative, as well as quantitative, analysis of the influence of the dimensions of Bi(2223)/Ag based cylindrical magnets on the energy stored in the magnet's winding was performed for various operating temperatures. The results achieved can be used to consider the potential suitability of the high-temperature superconductivity magnets for the purposes of micro-superconducting magnetic energy storage applications. A mathematical model which enables one to calculate the values of basic parameters, such as the critical current and stored energy of cylindrical magnets consisting of the set of Bi(2223)/Ag pancake coils, was developed with respect to the real distribution of the magnetic field in the winding and the angular dependence (anisotropy) of the I c (B) characteristic of the tape. An example of a detailed analysis of the influence of the winding geometry, which is changed within the same overall length of 1, 2 and 5 km of the multifilamentary Bi(2223)/Ag tape, was performed at the temperatures of 77, 65 and 4.2 K. The most interesting and important result achieved is that the geometry of the winding that corresponds to the maximum stored energy differs according to the temperature. The disc-shaped magnets, which consist of a very low number of pancake coils, are the most suitable solution at 77 and 65 K. Simultaneously, the value of the stored energy is practically independent of the bore diameter of the magnet. On the other hand, when looking for the optimum winding geometry at 4.2 K, the magnets with the smallest bore diameter are more suitable, while the value of the energy stored does not depend on the number of pancake coils.

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Critical current density of Bi-2223/Ag multifilamentary tapes from 4.2 K up to 90 K in magnetic fields up to 23 T

Cited by 9 publications

References 10 publications

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb₃Sn superconducting strand

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb₃Sn superconducting strand

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

Energy and critical current considerations of Bi(2223)/Ag coils for micro-superconducting magnetic energy storage: influence of operating temperature and winding geometry within the same overall tape length

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Critical current density of Bi-2223/Ag multifilamentary tapes from 4.2 K up to 90 K in magnetic fields up to 23 T

Cited by 9 publications

References 10 publications

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb3Sn superconducting strand

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb3Sn superconducting strand

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

Energy and critical current considerations of Bi(2223)/Ag coils for micro-superconducting magnetic energy storage: influence of operating temperature and winding geometry within the same overall tape length

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The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb₃Sn superconducting strand

The field, temperature and strain dependence of the critical current density of a powder-in-tube Nb₃Sn superconducting strand