Title :
Quench Protection Design of an 8-T Magnet Built With Low- and High-Temperature Superconducting Coils
Author :
Yi Li ; Qiuliang Wang ; Shunzhong Chen ; Yuanzhong Lei ; Yinming Dai ; Zhipeng Ni ; Xinning Hu
Author_Institution :
Inst. of Electr. Eng., Beijing, China
Abstract :
A quench protection system has been proposed for an 8-T split superconducting magnet consisting of low-temperature superconducting (LTS) NbTi coils and high-temperature superconducting (HTS) Bi2223 coils. For the LTS coils, a code has been developed to adjust the circuit parameters and the heater geometry. The calculation method of the internal electric potential in the LTS coil is introduced. For the HTS coils, the temperature and current margins are studied. The voltage signal for quench detection is chosen, and quench simulations on the HTS coil with different heating fluxes and heating zones are performed. The simulation results show that the employment of only the dump resistors can bring down the current and the temperature rise rapidly in the event of a quench. The coupling effect of the LTS and HTS coils is simulated and analyzed.
Keywords :
bismuth compounds; calcium compounds; high-temperature superconductors; niobium alloys; strontium compounds; superconducting coils; superconducting magnets; titanium alloys; Bi2Sr2Ca2Cu3O10; HTS coil; LTS coil; NbTi; circuit parameter; dump resistors; heater geometry; heating flux; heating zone; high temperature superconducting coil; internal electric potential; low temperature superconducting coil; magnetic flux density 8 T; quench protection design; split superconducting magnet; Coils; Electric potential; High temperature superconductors; Resistance heating; Resistors; Superconducting magnets; Bi2223; Opera quench; heater; high-temperature superconducting (HTS) coil; quench detection; quench protection;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2012.2198646
