Quench protection circuit for superconducting magnet system based on distributed heater network

A quench protection circuit for a superconducting magnet system based on a distributed heater network, comprising:

• M superconducting coils connected in series and a heater network formed by N heater modules, where M>N and N≤3, wherein the different heater modules are connected in parallel with different superconducting coil subsets, wherein each of the superconducting coil subsets is formed by:
• one superconducting coil, plural superconducting coils, one superconducting sub-coil, or one superconducting sub-coil and one superconducting coil, wherein the superconducting sub-coil is a part of the superconducting coil,
• wherein each of the heater modules has m parallel branches, and each of the parallel branches has n heaters connected in series, where m≥1, n≥1, and when N=1, m≥1, wherein each of the heaters in the heater network is thermally coupled to one superconducting coil among the M superconducting coils, and each of the superconducting coil is thermally coupled to at least one of the heaters in each of the heater modules, m*n≥M,
• wherein when N=1, m>1 and n>1, the superconducting coil subsets connected in parallel with the heater modules have spatial symmetry;
• wherein when N=2, m≥1 and n≥1, two superconducting coil subsets connected in parallel with two corresponding heater modules have spatial symmetry, a union of the two superconducting coil subsets is less than the M superconducting coils, and the two corresponding heater modules have the same circuit structures and back up each other in function;
• wherein when N=3, m≥1 and n≥1, three superconducting coil subsets connected in parallel with three corresponding heater modules have spatial symmetry, two heater modules in symmetrical positions have the same circuit structures and back up each other in function.