Quench Protection of Nb3Sn High Field Magnets Using Heaters, a Strategy Applied to the Graded Racetrack Dipole R2D2
Résumé
The quench protection for the Future Circular Collider (FCC) 16 T Nb3Sn dipoles was based either on the CLIQ (Coupling Loss Induced Quench) system, or on resistive quench protection heaters. Several heater designs were sketched during the iterative magnet design processes. This led to identifying some rules about an effective heater design in the full-scale 14-m-long magnets. Following the FCC study, short dipole magnet models are being built to test the novel features that were envisioned for the FCC magnets. In this work, we review the principles of effective heater design, and then apply this methodology to the graded block dipole short model R2D2, which is being designed at CEA Saclay. This magnet has high current density in copper after quench, which makes the protection challenging and requires pushing the heater technology to its limits.
Mots clés
Heating systems
Superconducting magnets
Coils
Delays
Power cables
Strips
Hafnium
accelerator magnets
current density
magnetic fields
niobium alloys
superconducting magnets
tin alloys
CEA Saclay
CLIQ system
coupling loss induced quench system
dipole magnet models
FCC magnets
future circular collider
graded racetrack dipole
high field magnets
iterative magnet design processes
Nb3Sn/int
quench protection heaters
Accelerator magnets
protection heaters
Nb $_3$ Sn dipoles quench protection
current, density
magnet, design
accelerator, magnet
magnet, superconductivity
niobium, alloy
magnet, coil
current, high
magnetic field, density
quenching
dipole
FCC
graded
bending magnet
copper
hafnium
tin