Strain energy minimization in SSC magnet winding

Cook, J.M.

doi:10.1109/20.133592

Cited by 34 publications

(20 citation statements)

References 6 publications

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“…A coil end design that is useful for saddle, block and cos θ coils using thin tape conductors was also proposed in [11]. The constant-perimeter method was extended to model the bending of Rutherford cables [12]. The method was also implemented in ROXIE, a software package that is widely used for accelerator magnet design [13].…”

Section: Introductionmentioning

confidence: 99%

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Wang

Arbelaez

Caspi

et al. 2017

IEEE Trans. Appl. Supercond.

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Abstract-Cable and magnet applications require bending REBa2Cu3O 7−δ (REBCO, RE = Rare Earth) tapes around a former to carry high current or generate specific magnetic fields. With a high aspect ratio, REBCO tapes favor the bending along their broad surfaces (easy way) than their thin edges (hard way). The easy-way bending forms can be effectively determined by the constant-perimeter method that was developed in the 1970s to fabricate accelerator magnets with flat thin conductors. The method, however, does not consider the strain distribution in the REBCO layer that can result from bending. Therefore, the REBCO layer can be over-strained and damaged even if it is bent in an easy way as determined by the constant-perimeter method.To address this issue, we developed a numerical approach to determine the strain in the REBCO layer using the local curvatures of the tape neutral plane. Two orthogonal strain components are determined: the axial component along the tape length and the transverse component along the tape width. These two components can be used to determine the conductor critical current after bending. The approach is demonstrated with four examples relevant for applications: a helical form for cables, forms for canted cos θ dipole and quadrupole magnets, and a form for the coil end design. The approach allows to optimize the design of REBCO cables and magnets based on the constantperimeter geometry and to reduce the strain-induced critical current degradation.

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Section: Introductionmentioning

confidence: 99%

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Wang

Arbelaez

Caspi

et al. 2017

IEEE Trans. Appl. Supercond.

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“…A "developable surface/grouped" configuration was chosen. 5,12,13,14 Conductor placement on the ends was generally very good. The end parts did not lilt from the mandrel surface during winding by more than 1/16 inch as shown in Fig.…”

Section: Dsa321 Assembly Historymentioning

confidence: 99%

Initial Results from 50mm Short SSC Dipoles at Fermilab

et al. 1991

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“…This surface is based on the rectifying developable, and is by definition the least-strain surface definable within the given constraints [4,5]. The radially outer edge of the guiding strip lies on the outer surface of the tube and is called the base curve.…”

Section: Group Definitionsmentioning

confidence: 99%

“…The grouped end design approach treats each current block as a group of conductors that originate at the end of the coil straight section and maintain conductor-to-conductor contact as they wind around and over the mandrel. The group is a mathematically determined configuration that attempts to minimize the strain energy of individual conductors within the group, and is created by a computer program, BEND, written by Joe Cook [4,5]. This program is the heart of a complete coil end design system which consists of using BEND to create and optimize the groups, combining the group boundary surface files into files which represent the coil end parts, and reading these files into a CAD package to produce the part geometry.…”

Section: Introductionmentioning

confidence: 99%

Coil end design for the LHC dipole magnet

Brandt¹

1996

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This paper describes the design of the coil ends for the Large Hadron Collider dipole magnets of the CERN European Laboratory for Particle Physics in Switzerland. This alternative to existing European designs was provided by Fermi National Accelerator Laboratory by agreement between CERN and the United States. The superconducting cable paths are determined from both magnetic and mechanical considerations. The coil end parts used to shape and constrain the conductors in the coil ends are designed using the developable surface, grouped end approach. This method allows the analysis of strain energy within the conductor groups, and the optimization of mechanical factors during the design. Design intent and implementation are discussed. Inner and outer coil design challenges and end analyses are detailed.

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Strain energy minimization in SSC magnet winding

Cited by 34 publications

References 6 publications

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Initial Results from 50mm Short SSC Dipoles at Fermilab

Coil end design for the LHC dipole magnet

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