US 12,347,612 B2
Symmetric quench protection of resistive insulation coils
William Denis Markiewicz, Ipswich, MA (US); Mark D. Bird, Tallahassee, FL (US); Iain R. Dixon, Tallahassee, FL (US); William Scott Marshall, Tallahassee, FL (US); Thomas A. Painter, Tallahassee, FL (US); and Peng Xu, Tallahassee, FL (US)
Assigned to Florida State University Research Foundation, Inc., Tallahassee, FL (US)
Filed by Florida State University Research Foundation, Inc., Tallahassee, FL (US)
Filed on Mar. 16, 2023, as Appl. No. 18/122,276.
Claims priority of provisional application 63/320,423, filed on Mar. 16, 2022.
Prior Publication US 2023/0298790 A1, Sep. 21, 2023
Int. Cl. H01F 6/02 (2006.01); H01F 6/06 (2006.01)
CPC H01F 6/02 (2013.01) [H01F 6/06 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A magnet comprising:
a stack of a plurality of superconducting pancake wound coils having an axis normal to a winding direction of the coils, the stack having axial ends and having a stack midplane relative to the axis;
a quench detector for detecting a quench in the stack of superconducting pancake wound coils; and,
a plurality of resistance quench heaters (RQH) distributed symmetrically along the axis with respect to the stack midplane;
control circuitry for controlling the operation of the RQH upon the detection of a quench by the quench detector;
further comprising a quench initiation coil (QIC) at each axial end of the stack;
wherein the QIC has an operating current within ±30% of the operating current of the superconducting pancake wound coils.