Niobium-tin magnet technology development at Fermilab

Chichili, D.R.; Arkan, T.; Terechkine, I.; Rice, J.A.

doi:10.1109/pac.1999.792263

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…A second sample type are so-called ten-stack samples. These samples are made of ten Nb3Sn 11 T dipole cables that are stacked alternatingly in order to compensate for the cable keystone angle [11]. The cables have been stacked in a reaction fixture and followed the same reaction heat treatment cycle as the 11 T dipole coils.…”

Section: A the Samplesmentioning

confidence: 99%

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb₃Sn Rutherford Cable Stacks

Wolf

Scheuerlein

Lorentzon

et al. 2019

IEEE Trans. Appl. Supercond.

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The Nb3Sn superconductor in accelerator magnets must resist high mechanical stresses. In order to understand better the effect of the coil impregnation system on the stresses exerted on the strain-sensitive Nb3Sn superconductor, we have measured the elastic strain evolution in the conductor constituents under externally applied loads. For this purpose a dedicated load frame that enables rotation of the sample load axis with respect to the neutron scattering geometry was installed in the Stress-Spec beamline at the neutron source Heinz Maier-Leibnitz FRM II. The Nb3Sn and Cu loading strain was measured in situ by neutron diffraction under monotonic and cyclic compressive loading. Socalled ten-stack samples composed of Nb3Sn Rutherford type cable with different impregnation, and coil blocks extracted from a 11 T dipole short model coil were investigated.

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Section: A the Samplesmentioning

confidence: 99%

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb₃Sn Rutherford Cable Stacks

Wolf

Scheuerlein

Lorentzon

et al. 2019

IEEE Trans. Appl. Supercond.

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“…However, no such curves are available for 10-stack coil samples made from PIT B215 strands. In fact, due to the difficulty of measuring the stressstrain curves at 4.2 K, only two complete sets of testing curves at 293 K and 4.2 K were found in the literature [70,72]. These stress-strain curves were measured using different types of Nb 3 Sn strands other than PIT B215.…”

Section: Stress-strain Curves Of 10-stack Coil Sample and Deformation...mentioning

confidence: 99%

“…These stress-strain curves were measured using different types of Nb 3 Sn strands other than PIT B215. Fermilab reported one set of loading-unloading-reloading stress-strain curves of 10-stack Nb 3 Sn coil samples with ceramic insulation both at 300 K and at 4.2 K [72]. Maria Durante of CEA (the French Alternative Energies and Atomic Energy Commission) reported another set of loading-unloading-reloading stress-strain curves (at 4.2 K and 293 K) of 10-stack Nb 3 Sn coil samples [70].…”

Section: Stress-strain Curves Of 10-stack Coil Sample and Deformation...mentioning

confidence: 99%

Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets

Sun¹

2022

Supercond. Sci. Technol.

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A multi-scale nonlinear procedure to analyze the stress in Nb3Sn superconducting accelerator magnets is presented to address one of the most challenging obstacles currently facing the successful development of high-field superconducting magnets—the issue of stress management. The study demonstrates that gaskets (special nonlinear materials) are capable of modeling the complex nonlinear deformation behavior of insulation layers within the Nb3Sn coil block and that Hill materials (orthotropic materials utilizing the Hill yield criterion) are suitable to enable homogenization of the filamentary regions and the resin-impregnated Nb3Sn Rutherford cables. With the whole magnet under preload, cool-down, and Lorentz forces, the nonlinear behavior of the Nb3Sn coil was simulated, in three orthongonal axes, by the combined properties of the gaskets (insulation layers) and Hill materials (resin-impreganted cable). The procedure entailes minimal material assumptions because it incorporated measured stress-strain curves in the analysis. The coil was simulated to a high level of detail consisting of the insulation layers and resin-impregnated cables. The computed compressive azimuthal stresses of the cables were used to assess the stress-induced performance degradation. Through submodeling, the area-weighted average axial strains of the strands were computed and employed to evaluate the strain-induced performance degradation. The overall performance degradation of the Nb3Sn coil was thus obtained, and this information was subsequently used to guide the design of the overall magnet. Besides Nb3Sn magnets, this procedure can also be employed in the design of LTS, HTS, and room temperature magnets or in any composite structures.

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“…Strand and cable parameters are presented in Table 3 and 4. The cable is insulated with a high temperature ceramic insulation having 125 µm azimuthal and 125 µm radial thickness [2].…”

Section: Magnet Designmentioning

confidence: 99%

Conceptual design of the Fermilab Nb3Sn high field dipole model

Ambrosio

Andreev

Arkan

et al. 1999

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A short dipole model with the 10-11 T nominal field based on the Nb3Sn superconducting strand is being developed at Fermilab in collaboration with LBNL and KEK as part of the R&D effort for VLHC. This paper describes the magnet conceptual design and parameters as well as the results of magnetic field, mechanical and quench protection calculations. Parameters of the superconducting strand and cable are also reported.

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Niobium-tin magnet technology development at Fermilab

Cited by 9 publications

References 3 publications

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb₃Sn Rutherford Cable Stacks

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb₃Sn Rutherford Cable Stacks

Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets

Conceptual design of the Fermilab Nb3Sn high field dipole model

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Niobium-tin magnet technology development at Fermilab

Cited by 9 publications

References 3 publications

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb3Sn Rutherford Cable Stacks

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb3Sn Rutherford Cable Stacks

Multi-scale nonlinear stress analysis of Nb3Sn superconducting accelerator magnets

Conceptual design of the Fermilab Nb3Sn high field dipole model

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Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb₃Sn Rutherford Cable Stacks

Effect of Applied Compressive Stress and Impregnation Material on Internal Strain and Stress State in Nb₃Sn Rutherford Cable Stacks

Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets