Low-inductance CORC® solenoid magnets – Advanced Conductor Technologies LLC

LOW-INDUCTANCE CORC^® SOLENOID MAGNETS

Advanced Conductor Technologies has developed high-current, low inductance solenoid magnets, wound from CORC^® cables and wires that allow for high current ramp rates of over 1 T/s. The low magnet inductance and the ability of CORC^® conductors to share current between tapes results in more stable operation, easier detection of the onset of a quench and more reliable magnet protection.

CORC^® solenoids are available as high-field inserts within conventional low-temperature superconducting (LTS) magnets.


Left: CORC^® insert solenoid with 100 mm bore. Right: Voltage over the CORC^® solenoid as a function of current at different magnetic fields generated by the LTS outset. The 14 T LTS outsert and CORC^® insert generated a combined peak magnetic field of 16.77 T.

Stand-alone CORC^® solenoids are available for operation in liquid helium or using cryogenic helium gas at elevated temperatures. Advanced Conductor Technologies has demonstrated the technology of operating two CORC^® solenoids in series, in which the inner coil contains three CORC® wires wound in parallel.


Left: Stand-alone CORC^® solenoid wound from a CORC^® wire containing REBCO tapes with local dropouts. Right: Voltage as a function of current of the 70 mm bore solenoid at 25 K, generating a peak magnetic field of 4.8 T at 4,500 A.


Left: Cross-section of a series-connected pair of CORC^® solenoids. Right: Winding of the CORC^® insert solenoid in which three CORC^® wires are operated in parallel.

Central magnetic field as a function of current at 4 K of the 60 mm bore series-connected CORC^® solenoid pair, generating a central magnetic field of 5.14 T at 10,000 A

	Stand-alone CORC^® solenoid		CORC^® insert solenoid
Outsert Magnetic Field	0 T		8.75 T	12 T
Outsert Clear Bore	-	-	120 mm	170 mm
CORC^® Insert Bore	50 mm	100 mm	50 mm	100 mm
Current	8,000 A	11,000 A	5,600 A	8,300 A
Central Field	12 T	12 T	17 T	22 T

Conceptual designs of a 40 T CORC^® solenoid, in which several CORC^® coils are operated within an LTS outsert, and a 20 T large-bore stand-alone CORC^® solenoid have been developed.


Left: Central magnetic field of a 50 mm bore, 40 T hybrid CORC^® solenoid operating at 11,000 A. Right: Central magnetic field of a 1.2 m bore, 20 T CORC^® solenoid operating at 25,000 A.