Effect of Transverse Pressure on Brittle Superconductors

Barzi, E.; Turrioni, D.; Zlobin, A.V.

doi:10.1109/tasc.2008.921322

Cited by 13 publications

(13 citation statements)

References 7 publications

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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

2012

Rev. Accl. Sci. Tech.

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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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Section: Transverse Pressure On Cablesmentioning

confidence: 99%

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Bottura

Godeke

2012

Rev. Accl. Sci. Tech.

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“…9. Predictions of normalized critical current vs. transverse pressure for a constrained sample using the Maximum Eigenvalue model and the model of Maximum angular deformation on the cross section compared with uni-axial data on a MJR cable [4] and a MJR cable test [8]. …”

Section: Discussionmentioning

confidence: 99%

“…Transport properties measurements in [1][2][3][4][5][6][7][8] were based on the principle of applying transverse pressure on a sample and then measuring its critical current I c . We can think of at least two different boundary conditions for the cable, which may produce different current density performances: plane stress with free sides, and plane stress with constrained sides (Fig.…”

Section: Equivalent Strain Modelsmentioning

confidence: 99%

“…ORK in literature on the sensitivity of Nb 3 Sn cables to strain has been conducted in a number of stress states, including uniaxial [1][2][3][4][5] and multi-axial [6][7][8] stress states, using some very different experimental setups. In order to determine a model that assigns to each tensor a scalar representation, we need data exploring all the dimensions of the tensor by means of an experiment that provides consistent and controlled conditions.…”

Section: Introductionmentioning

confidence: 99%

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Brittle superconducting magnets: an equivilent strain model

Barzi¹,

Danuso²

2010

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In conventional structural problems an equivalent stress model is typically used to verify mechanical soundness. In the superconducting community a simple scalar equivalent strain to be used in place of an equivalent stress would be an extremely useful tool. As is well known in fundamental mechanics, there is not one single way to reduce a multiaxial strain state as represented by a 2 nd order tensor to a scalar. The conceptual experiment proposed here will help determine the best scalar representation to use in the identification of an equivalent strain model. Index Terms-Equivalent strain, uni-axial stress state, multiaxial stress state, critical current

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“…This limit has a strong dependence on the strand lay-out and fabrication: in some cases measurements have shown significant degradation already at the level of 50-100 MPa. The RRP, which is the workhorse of the LARP, has shown negligible degradation up to more than 150 MPa [14,15]. These measurements are particularly tricky since the real condition of stress of the cable in the magnet is hard to achieve in a sample.…”

Section: Forces Stress Strainmentioning

confidence: 99%

Limits to High Field Magnets for Particle Accelerators

Todesco

Ferracin

2012

IEEE Trans. Appl. Supercond.

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What is the ultimate limit to high fields in superconducting magnets for particle accelerators? In this paper we review the present status of the technology, outlining the main limitations. We first analyse the needed margin for operating a magnet in an accelerator. We then review the relation between current densities, coil widths, and fields in the magnets build so far. The issue of stress and the dependence on the coil lay-out is then discussed: a careful optimization between current density and coil width can be needed to keep the forces and associated strain within acceptable limits.The main issues related to cable lay-out (strand diameter, filament size) are then discussed. We conclude by giving a hint on the requirements on a HTS conductor, and a summary of Nb-Ti and Nb 3 Sn. CERN-ATS-2012-052February 2012 Abstract 4AO-1 EDMS 1184259 1  Abstract -What is the ultimate limit to high fields in superconducting magnets for particle accelerators? In this paper we review the present status of the technology, outlining the main limitations. We first analyse the needed margin for operating a magnet in an accelerator. We then review the relation between current densities, coil widths, and fields in the magnets build so far. The issue of stress and the dependence on the coil lay-out is then discussed: a careful optimization between current density and coil width can be needed to keep the forces and associated strain within acceptable limits. The main issues related to cable lay-out (strand diameter, filament size) are then discussed. We conclude by giving a hint on the requirements on a HTS conductor, and a summary of Nb-Ti and Nb 3 Sn.

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Effect of Transverse Pressure on Brittle Superconductors

Cited by 13 publications

References 7 publications

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Brittle superconducting magnets: an equivilent strain model

Limits to High Field Magnets for Particle Accelerators

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