Coil Design for Strongly Curved Magnets Based on the Differential Geometry of the Frenet Frame

Liebsch, Melvin; Russenschuck, Stephan

doi:10.1109/tasc.2023.3338167

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…Finally, a second level of correction is added to account for the finite length of the magnet compared to a perfect toroid. A detailed explanation is given in [20]. For this design, we have chosen the perfect dipole as a case of study but this formulation can be applied to any desired field shape in curved CCT configurations.…”

Section: Multi-harmonic Corrections For Curvaturementioning

confidence: 99%

Curved-Canted-Cosine-Theta (CCCT) Dipole Prototype Development at CERN

Haziot,

Kirby,

Dallocchio

et al. 2024

IEEE Trans. Appl. Supercond.

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Due to its flexibility in generating advanced field harmonic corrections and potential for low cost compared to traditional designs, the Canted Cosine Theta (CCT) configuration is particularly interesting for compact particle accelerators and gantries for medical applications. This article presents the design of a curved demonstrator named Fusillo, a Canted Cosine Theta Nb-Ti dipole magnet that is being developed at CERN, featuring a large aperture of 236 mm, a small bending radius of 1 m, a bending angle of 90 • , and multi-harmonic field correction, with a 3.61 T conductor peak field. We detail the magnetic coil design, incorporating high-order magnetic field correction of the errors produced by the heavily curved coil, peak field reduction at the coil ends, the development of a new rope type cable, and the mechanical design and the development of the former that supports the coil and provides the curved shape. We also present the first results of a subscale model used to qualify the coil's former manufacturing process, the rope cable, the coil winding optimization, and the coil impregnation system.

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Section: Multi-harmonic Corrections For Curvaturementioning

confidence: 99%

Curved-Canted-Cosine-Theta (CCCT) Dipole Prototype Development at CERN

Haziot,

Kirby,

Dallocchio

et al. 2024

IEEE Trans. Appl. Supercond.

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Quench Protection of Fusillo Subscale Curved CCT Magnet

Wozniak,

Haziot,

Mangiarotti

et al. 2024

IEEE Trans. Appl. Supercond.

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The Fusillo project at CERN aims to design and build a demonstrator magnet with multi-harmonic corrected fields in a 90° curved CCT magnet. In the first stage, a subscale magnet is built with 30° bending, about 1/30 of the demonstrator conductor length, and increased current to reach coil stresses equivalent to the demonstrator. The subscale magnet enables qualification of the technology developments, fabrication methods, winding and assembly procedures, and magnetic and quench protection design and measurement setups. The subscale magnet comprises two tilted solenoids with an opposite inclination on curved aluminium formers. Each solenoid has two channel turns with 70 Nb-Ti/Cu wires. The magnet is protected by an active quench detection with energy extraction (EE). EE causes current decay, which induces eddy currents in the formers. As a result, the differential inductance of the magnet is reduced, and the formers heat up, with the potential to strongly influence the quench behaviour of the windings. Simulation of the eddy currents and heat propagation in the formers with simultaneous quench propagation in the magnet windings requires a three-dimensional (3D) simulation.A cooperative simulation approach has been developed to simulate transients in this magnet. It involves two software tools developed at CERN as part of the STEAM framework: a finite element-based tool called FiQuS and a finite difference-based tool called LEDET. FiQuS calculates eddy currents in the formers and the temperature of the formers, whereas LEDET calculates windings' temperature, current and voltage. This approach enables a 3D quench simulation with great geometrical detail while maintaining reasonable computational cost.The simulation results are compared to measurement results from the forced EE. The agreement between the measurements and simulations is presented, and the key factors that affect magnet quench behaviour are identified.

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Coil Design for Strongly Curved Magnets Based on the Differential Geometry of the Frenet Frame

Cited by 2 publications

References 23 publications

Curved-Canted-Cosine-Theta (CCCT) Dipole Prototype Development at CERN

Curved-Canted-Cosine-Theta (CCCT) Dipole Prototype Development at CERN

Quench Protection of Fusillo Subscale Curved CCT Magnet

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