• Scaling up NI coils results in a very slow ramp time due to high L/R time constant • Putting novel partial insulation (PI) between turns allows desired, higher, turn-to-turn resistance (R) • L/R ramp time constant can be reduced to suit coil size and application • PI allows fast ramping of large coils, but retains the excellent quench stability & defect tolerance demonstrated in our solder potted NI线圈