Quench propagation circuit for superconducting magnets
View Patent ↗A quench propagation arrangement for a superconducting magnet comprising a plurality of series-connected superconducting coils, the arrangement comprising: a positive supply line connected to cathodes of first diodes, of which respective anodes are connected to each respective node of the series connection of superconducting coils; a negative supply line connected to anodes of second diodes, of which respective cathodes are connected to each respective node of the series connection of superconducting coils; a number of heaters, respectively thermally connected to each of the superconducting coils and electrically connected between the positive supply line and the negative supply line; and a voltage limiter connected between the positive supply line and the negative supply line, in parallel with the heaters.
1. A quench propagation arrangement for a superconducting magnet comprising:
first and second series-connected superconducting coils each being connected on a first side to a common node, the first superconducting coil being connected on a second side to a first node;
a first diode having a cathode connected to a positive supply line and an anode connected to the common node;
a second diode having a cathode connected to the positive supply line and an anode connected to the first node;
a third diode having an anode connected to a negative supply line and a cathode connected to the common node;
a fourth diode having an anode connected to the negative supply line and a cathode connected to the first node;
a number of heaters, respectively thermally connected to each of the superconducting coils and electrically connected between the positive supply line and the negative supply line; and
a voltage limiter connected between the positive supply line and the negative supply line, in parallel with the heaters.
2. An arrangement according to claim 1 , further comprising a diode connected in series between one of the supply lines and the parallel combination of heaters and the voltage limiter.
3. An arrangement according to claim 1 , wherein the heaters are themselves connected in parallel, each in parallel with the voltage limiter.
4. An arrangement according to claim 1 , wherein the heaters are themselves connected in series, the series combination of heaters being connected in parallel with the voltage limiter.
5. An arrangement according to claim 1 , wherein the voltage limiter consists of at least one diode.