An Integrated Coil Form Test Coil Design for High Current REBCO DC Solenoids

REBCO high-temperature superconductors (HTS) are being utilized to extend the limits of dc solenoidal magnetic fields to 32 T in a user magnet. It is reasonable to expect that these field limits will continue to be surpassed resulting in higher stored energy coils. These larger coils will require kilo-amp level currents to reduce their inductance to manageable levels. Lower inductance coils will be necessary to eliminate unacceptably long ramp times and expensive high voltage isolation hardware by reducing inductive charging and quench voltages. A novel high-current coil concept, using an integrated coil form (ICF), is described here. The coil concept is being developed in combination with a high-current flux pump at the University of Cambridge. The first test coil will be charged to 5.6 kA and will demonstrate the ICF coil winding technique, current lead connections, layer transitions, and coil terminations, as well as ramping and quench performance. The test coil design is described.