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Critical current versus strain measurement up to and of long length superconducting wires and tapes
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10.1063/1.2018608
/content/aip/journal/rsi/76/9/10.1063/1.2018608
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/9/10.1063/1.2018608

Figures

Image of FIG. 1.
FIG. 1.

Walters spring with a mounted wire with a rectangular cross section. The position of the voltage taps is indicated.

Image of FIG. 2.
FIG. 2.

Schematic view of the probe. The WASP and the torque sensor are positioned inside the cryostat, whereas the motor with gearbox and optoencoder, as well as the RT torque sensor, are sitting at room temperature.

Image of FIG. 3.
FIG. 3.

The torque (as measured by the sensor) as a function of the increasing rotation angle at room temperature and at . The zero position of the torque, as well as that of the angle, is set arbitrarily.

Image of FIG. 4.
FIG. 4.

Micrographs of the investigated wire samples: (a) wire from Vacuumschmelze NST4675TaA with a diameter of , (b) experimental bronze wire with a diameter of , fabricated at the University of Geneva–Institute of Applied Physics, (c) wire from Vacuumschmelze NSTT24000-A23 with a rectangular cross section of , and (d) Bi-2223 tape from American Superconductor, type three-ply wire with stainless steel reinforcement. wires are without reaction heat treatment.

Image of FIG. 5.
FIG. 5.

(overall) vs strain of a wire NST4675 with a diameter of (sample No. 1) at and , measured over a sample length of . Because the wire was soldered onto the WASP a compressive strain up to could be applied additionally.

Image of FIG. 6.
FIG. 6.

The value vs strain of wire NST4675 with a diameter of (sample No. 1) at and , as estimated between the 0.1 and criterion. The distance between the voltage taps is 52 and for contact 1–2 and 3–4, respectively.

Image of FIG. 7.
FIG. 7.

(overall) vs strain of wire NST4675 with a diameter of (sample No. 1) at and in comparison with previous measurements in the ITER program carried out by the University of Durham (Ref. 17) and the University of Twente (Ref. 16). Note that the data of Twente have been normalized to the position of the peak and a criterion have been applied. The Durham data are at 1.0 and .

Image of FIG. 8.
FIG. 8.

The overall critical current as a function of applied strain for the experimental bronze conductor manufactured at the University of Geneva–Institute of Applied Physics, with a diameter of (sample No. 2) at different fields and .

Image of FIG. 9.
FIG. 9.

The value as a function of applied strain for the experimental bronze conductor manufactured at the University of Geneva–Institute of Applied Physics, with a diameter of (sample No. 2) at different fields and . The value was determined by taking into account all points of the vs curve between the 0.1 and the criterion.

Image of FIG. 10.
FIG. 10.

The overall critical current and the value as a function of applied strain for wire NSTT24000-A23 with a rectangular cross section of (sample No. 3) at and . The strain is measured by a strain gauge directly glued on the wire. The distance between the voltage taps is . The value was determined by taking into account all points of the curve between the 0.1 and criterion.

Image of FIG. 11.
FIG. 11.

The overall critical current as a function of the magnetic field for wire NSTT24000-A23 with a rectangular cross section of (sample No. 3) and at the strain of 0.26%. The distance between the voltage taps is .

Image of FIG. 12.
FIG. 12.

The overall critical current as a function of applied strain for the AMSC Bi-2223 three-ply tape with a cross section of (sample No. 4) at and . The strain is measured by a strain gauge directly glued onto the tape. The distance between the voltage taps is .

Image of FIG. 13.
FIG. 13.

The value as a function of applied strain for the AMSC Bi-2223 three-ply tape (sample No. 4) at and . The value was determined by taking into account all points of the curve between the 0.1 and criterion. The strain is measured by a strain gauge directly glued onto the wire.

Tables

Generic image for table
Table I.

Main characteristics of the investigated superconductors.

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/content/aip/journal/rsi/76/9/10.1063/1.2018608
2005-08-23
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Critical current versus strain measurement up to 21T and 1000A of long length superconducting wires and tapes
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/9/10.1063/1.2018608
10.1063/1.2018608
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