Alternative power supply and dump resistor connections for similar, mutually coupled, superconducting coils

Alternative methods of connecting similar mutually coupled coils to their power supplies and dump resistors are investigated. The circuits are evaluated for both operating and fault conditions. The factors considered are the voltage to ground during a dump, short cicuits, open circuits, quenches, and failure of the protection system to detect a quench. Of particular interest are the currents in coils that remain superconducting when one or more coils quench. The alternative connections include combined power supplies, individual dump resistors, combined resistors and series and parallel dump resistors. A new circuit that contains coupling resistors is proposed. The coupling resistors do not affect normal fast dumps but reduce the peak induced currents while also reducing the energy rating of the dump resistors. The series circuit with diodes, is discussed. The MFTFB central cell solenoids are used as an example.