Abstract: A superconductive-magnet electrical circuit includes a superconductive-coil assemblage having a second coil portion coupled in series with and between first and third coil portions with the third coil portion coupled in series with and between the second and a fourth coil portion. A bipolar current-bypass electrical-circuit element (such as a pair of diodes opposingly coupled together in parallel) has: an impedance less than generally one-thousandth that of the coil portions; a first terminal coupled in parallel with the first and second coil portions; and a second terminal coupled in parallel with the third and fourth coil portions. A localized quench in one coil portion will be quickly shared with the other coil portions to reduce damage from the quench.

Abstract: A quench-protecting superconductive-magnet electrical circuit. An impregnated superconductive-switch wire is coupled to the leads of a cryostable superconductive-coil assemblage having series-coupled coil portions. Series-coupled fan-in resistive heaters are also coupled in parallel with corresponding coil portions and are positioned thermally proximate the superconductive-switch wire. Fan-out resistive heaters are coupled in parallel with corresponding coil portions and are positioned thermally proximate corresponding coil portions. A local quench in one coil portion activates its corresponding fan-in resistive heater which quenches the superconductive-switch wire which activates all of the fan-out resistive heaters which globally quenches all of the coil portions thereby preventing local quench damage.

Abstract: A superconductive-magnet electrical circuit includes a superconductive-coil assemblage having first, second, third, and fourth coil portions sequentially coupled together in series. A bipolar current-bypass electrical-circuit element (such as a pair of diodes opposingly coupled together in parallel) has:an impedance less than generally one-thousandth that of the coil portions; a first terminal coupled in parallel with the first and second coil portions; and a second terminal coupled in parallel with the third and fourth coil portions. A localized quench in one coil portion is quickly shared with the other coil portions to reduce damage from the quench. A resistor has a lead coupled in parallel with the second and third coil portions to limit quench voltages.