Superconducting-magnet electrical circuit having voltage and quench protection

A superconductive-magnet electrical circuit comprising:

• a) a superconductive-coil assemblage including first, second, third, and fourth superconductive-coil portions together having a total electrical impedance, wherein said second superconductive-coil portion is coupled in series with and between said first and third superconductive-coil portions, wherein said third superconductive-coil portion is coupled in series with and between said second and fourth superconductive-coil portions, wherein said first superconductive-coil portion abuts said second superconductive-coil portion, wherein said third superconductive-coil portion abuts said fourth superconductive-coil portion, and wherein said third and fourth superconductive-coil portions are spaced apart from said first and second superconductive-coil portions;
• b) a bipolar current-bypass electrical-circuit element having a first terminal, a second terminal, and an electrical impedance less than generally one-thousandth of said total electrical impedance, wherein said bipolar current-bypass electrical-circuit element is coupled to said superconductive-coil assemblage only through said first and second terminals, wherein said first terminal is only coupled to said superconductive-coil assemblage in parallel with said first and second superconductive-coil portions, and wherein said second terminal is only coupled to said superconductive-coil assemblage in parallel with said third and fourth superconductive-coil portions;
• and
• c) a resistor having a first lead and a second lead, wherein said first lead is coupled in parallel with said second and third superconductive-coil portions.