Conveners
Wed-Af-Or24: Quench Detection and Protection Systems - II
- Antti Aleksis Stenvall
- Vitaly Vysotsky (Russian Scientific R&D Cable Institute)
CERN and LARP (LHC Accelerator Research Program) are jointly developing Nb3Sn quadrupole magnets to be installed in the LHC for its upgrade to higher luminosity. The quench protection system of these magnets will include a combination of quench heaters attached to the coil surface and CLIQ units electrically connected to the coils. This solution provides an effective reduction of the coil’s...
In high temperature superconducting (HTS) magnet applications, quench detection is very important to protect magnets before burning out. However, due to a very slow quench propagation of HTS wires compared with low temperature superconducting (LTS) ones, conventional quench detection methods are not suitable for HTS magnet: The method is that continuously measure resistive voltages on voltage...
The paper describes intricate cross coupling of quench detection and energy extraction systems to protect a hybrid dipole magnet built with Low Temperature Superconductor (LTS) outer coils and High Temperature (HTS) inner coils during the quench. Quench characteristics of HTS and LTS are quite different and various different parameters had to be considered in designing reliable quench...
For reaching very high magnetic fields in fully superconducting magnets beyond 20T the use of High-Temperature Superconductors (HTS) is unavoidable. Due to the high Minimum Quench Energy in HTS, when operating in the temperature range of 4-20K, these coils are not very likely to quench. A nice twist of fate is, however, that it is the same stability that makes these coils much more difficult...
Sure quench protection of HTS coils is essential for their sustainable operations. The most probable cause of quench damages is the over-heating at the highest temperature spot (hot-spot) of the coil wire during the quench protection sequence. Therefore, to avoid the damage, generated heat in the hot-spot of the coil conductor has to be decreased by quick decrease of a current flowing in the...
Quench protection is the elephant in the room that no ones seems to see when it comes to HTS magnets. For the most part quench protection has not been much of a problem, because the stored energies of HTS magnets have been low compared to magnets made with LTS conductors. The principles of quench protection are the same regardless of the type of superconductor used. In general, a quench is...
