Transport Properties up to 1000 A of ${\rm Nb}_{3}{\rm Sn}$ Wires Under Transverse Compressive Stress

Seeber, B.; Ferreira, Alexandre José Sousa; Abächerli, V.; Boutboul, T.; Oberli, L.; Flükiger, R.

doi:10.1109/tasc.2007.897934

Cited by 24 publications

(26 citation statements)

References 11 publications

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“…The critical current also depends on transverse compressive forces. [4][5][6][7][8] Although transverse forces in a magnet are smaller in comparison to the axial ones, they must be taken into consideration at the ultimate limit of high field magnets. It follows that the full three-dimensional ͑3D͒ stress/strain state must also be investigated when cabling is required, e.g., for a cable in conduit or in accelerator multipole magnets.…”

Section: Improvement Of Electromechanical Properties Of An Iter Intermentioning

confidence: 99%

Improvement of electromechanical properties of an ITER internal tin Nb3Sn wire

Mondonico

Seeber

Senatore

et al. 2010

Journal of Applied Physics

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The critical current of an internal tin Nb 3 Sn wire developed by Oxford Instruments, Superconducting Technology for International Thermonuclear Experimental Reactor ͑ITER͒ ͑OST type-I, billet No. 7567͒ has been studied under axial strain at fields between 12 and 19 T at 4.2 K. Simulating the situation in a cable in conduit, where thermally induced compressive strain is important, a single wire ͑strand͒ was jacketed with AISI 316L stainless steel. The reinforced wire shows an important increase in m , the applied strain where I c reaches its maximum, from 0.25% to 0.57%. In addition the irreversibility limit, irr , is improved from 0.50% applied strain to Ͼ1.10%. It could also be shown that the I c at zero intrinsic strain is almost identical. This demonstrates that jacketing does not influence the physical parameters of the original wire. Experimental data of the bare wire has been well fitted by different strain functions. However, it was not possible to model the data of the jacketed wire. There are indications that only models which take into account the multidimensional character of strain are able to describe the behavior but further development is required.

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Section: Improvement Of Electromechanical Properties Of An Iter Intermentioning

confidence: 99%

Improvement of electromechanical properties of an ITER internal tin Nb3Sn wire

Mondonico

Seeber

Senatore

et al. 2010

Journal of Applied Physics

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“…For that reason, transverse stress is limited to 40 MPa. The load was translated into pressure by dividing it with the projected area as usually done by many authors [6]- [9], [16], [17]. The deviatoric strain is defined as [10],…”

Section: Resultsmentioning

confidence: 99%

“…Unified scaling laws for flux pinning in superconducting strands are actively studied for practical applications such as the ITER magnet [2], [4], [5]. Manuscript On the other hand, the effect of transverse stress on the critical current has been rarely studied even though there were reports that transverse stress can damage strands much more severely than axial strain does [6]- [9]. Axial strain not only changes the length of wire but also affects wire diameter.…”

Section: Introductionmentioning

confidence: 99%

Reversible Transverse Stress Effects on the Critical Current of an Internal Tin ${\rm Nb}_{3}{\rm Sn}$Strand Under Axial Strain

Park

Lee

et al. 2010

IEEE Trans. Appl. Supercond.

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We have developed an apparatus to investigate the effect of transverse stress under axial strain on the critical current of superconducting strands. An internal tin Nb 3 Sn wire is soldered on a C-shape ring (called Pacman) made of 2% beryllium doped copper alloy and axial strain from 0.7 to 0.7% can be applied. The actual strain on a sample was estimated from a comparison with the critical current measurement results using a Walter spiral probe. Reversible transverse stress effects on the critical current were studied in this work and the transverse pressure was applied up to 40 MPa under 0.5% axial strain. The critical current was initially increased about 3% as transverse load was applied and then decreased almost linearly under compressive axial strain. Similar behavior is observed under tensile axial strain but the critical current decreases rather sharply at higher load. A unified description based on 3 dimensional deviatoric strain was difficult for the sample studied in this work.Index Terms-Deviatoric strain, internal tin Nb 3 Sn, scaling law for flux pinning, strain dependence of the critical current, transverse stress effects.

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“…The more recent measurements were performed on wires to try to establish a more economical alternative to complex and expensive full-size cable experiments. The results from transverse pressure experiments on wires [72][73][74][75][76], however, showed a significantly larger reduction in the critical current with transverse pressure, which triggered worries as to whether high-current Nb 3 Sn Rutherford cables would be more sensitive to transverse pressure, and therefore unsuitable for veryhigh-field magnet designs. These results contrasted with the successful test results from magnets, which were loaded to the 150-180 MPa region [77].…”

Section: Transverse Pressure On Cablesmentioning

confidence: 99%

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Bottura

Godeke

2013

Reviews of Accelerator Science and Technology

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Superconductivity is the technology that enabled the construction of the most recent generation of high-energy particle accelerators, the largest scientific instruments ever built. In this review we trace the evolution of superconducting materials for particle accelerator magnets, from the first steps in the late 1960s, through the rise and glory of Nb-Ti in the 1970s, till the 2010s, and the promises of Nb 3 Sn for the 2020s. We conclude with a perspective on the opportunities for high-temperature superconductors (HTSs). Many such reviews have been written in the past, as witnessed by the long list of references provided. In this review we put particular emphasis on the practical aspects of wire and tape manufacturing, cabling, engineering performance, and potential for use in accelerator magnets, while leaving in the background matters such as the physics of superconductivity and fundamental material issues.

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Transport Properties up to 1000 A of ${\rm Nb}_{3}{\rm Sn}$ Wires Under Transverse Compressive Stress

Cited by 24 publications

References 11 publications

Improvement of electromechanical properties of an ITER internal tin Nb3Sn wire

Improvement of electromechanical properties of an ITER internal tin Nb3Sn wire

Reversible Transverse Stress Effects on the Critical Current of an Internal Tin ${\rm Nb}_{3}{\rm Sn}$Strand Under Axial Strain

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

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