20 T Hybrid Nb3Sn-HTS Block-Coil Accelerator Dipole With Stress-Management
Résumé
In the framework of studies for high energy particle colliders, design concepts for high field dipoles are being explored. In particular, relatively compact 20 T magnets can be achieved in a hybrid configuration, combining a High Temperature Superconductor (HTS) and a Low Temperature Superconductor (LTS). Preliminary concepts have been previously proposed using Bi2212 for the HTS and Nb3Sn for the LTS. One of the main difficulties of 20 T magnets is the management of the very high stresses developing during operation. The design concepts rely on a rectangular block-coil layout, which offers the advantage of aligning the conductors with the main magnetic field, therefore submitting the conductors to a perpendicular electromagnetic force for a better control of the stresses. In addition, the layout allows a specific stress management, with adequate horizontal and vertical plates to intercept the stresses. The paper presents the improvements provided to the initial concept. In terms of magnetic design, the field quality has been improved. In terms of mechanical design, the stress management has been optimized to provide a compact coil with a reduced peak stress on the HTS. Concepts for flared-end coils with joints in the coil-ends are finally presented.
Mots clés
accelerator, magnet
particle, energy
magnet, superconductivity
niobium, alloy
temperature, high
flux, magnetic
superconductivity, temperature, high
flux, density
hybrid
dipole
magnetic field
quality
tin
finite element
iron
High-temperature superconductors
Stress
Iron
Coils
Magnetomechanical effects
Finite element analysis
Superconducting magnets
accelerator magnets
high-temperature superconductors
magnetic fields
niobium alloys
superconducting coils
superconducting magnets
tin alloys
Bi2212
coil-ends
field quality
high energy particle colliders
high field dipoles
high temperature superconductor
HTS block-coil accelerator dipole
hybrid configuration
low temperature superconductor
LTS
magnetic design
magnetic flux density 20 T
main magnetic field
mechanical design
Nb3Sn/bin
perpendicular electromagnetic force
rectangular block-coil layout
reduced peak stress
specific stress management
stress-management
High field magnet
hybrid magnet
HTS
Nb $_3$ Sn
temperature, low
coil, superconductivity
energy, high
force, electromagnetic