Summary
This paper addresses quality control methods for Nb₃Sn superconducting coil insulation systems destined for the High-Luminosity LHC project at CERN. The authors present online capacitive and frequency-domain impedance measurement techniques that enable real-time assessment of vacuum pressure impregnation success and provide insights into the curing process, resin choice impacts, and coil assembly geometry. These methods are demonstrated on short dipole magnet models and offer a pathway for optimising the VPI curing cycle and ensuring dielectric strength reliability during unprecedented series magnet production.
UK applicability
This research is not directly applicable to UK farming, soil health, or food systems. It addresses industrial quality control for particle accelerator magnet production at CERN in Switzerland and is outside the scope of Vitagri's research domain.
Key measures
Capacitive measurements, frequency impedance measurements, distributed lumped circuit electrical parameters, dielectric frequency response, impregnation process characterisation
Outcomes reported
The study demonstrates that online capacitive measurement and frequency impedance measurement methods can characterise the vacuum pressure impregnation (VPI) process in Nb₃Sn coils and provide insights into resin filling, curing cycles, and insulation material quality. Distributed lumped circuit fitting parameters derived from frequency impedance measurements of short dipole models enable transient characterisation of produced magnets.
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