Speaker
Description
In the design and use of superconducting magnets one must always ensure safe dissipation of the stored magnetic energy after a quench. External energy extraction with a dump resistor is relatively simple to implement, and it has the advantage of dissipating the energy outside of the cryostat. However, it’s capacity is limited by the maximum allowed voltage across the magnet terminals, which limits the dump resistor size. When external energy extraction is not enough, a common method is to apply electrical strip heaters on coil surfaces. After quench detection these heaters are activated, and they will bring the superconducting coils to normal state thus increasing the coil resistance, increasing the magnet current decay rate and limiting the peak temperature. In this lecture, we will discuss practical guidelines for estimating the magnet quench protection requirements. These include estimating the magnet peak temperature adiabatically based on the so-called MIITs-concept, voltage based quench detection, and how to design and use dump resistors and/or strip heaters for magnet quench protection.
About the speaker:
Tiina Salmi is an Academy Research Fellow at Tampere University. She defended her PhD thesis at Tampere University in 2025. She has worked for quench protection analyses for various accelerator magnets, including HiLumi LHC, FCC h-h, and Muon Collider dipoles and quadrupoles.
