Stabilization Of Dry-Wound High-Field Superconducting Magnet By Controlling Frictional Spring Force.

Superconducting magnets offer stable high magnetic fields without power consumption, and have wide application in magnetic resonance imaging equipment (MRI), superconducting magnetic energy strage (SMES), superconducting generators and so on. However, the magnets frequently suffer from quench fenomena and do not necessarily achieve the conductors'short sample critical currents. Mechanical disturbances, such as abrupt conductor motion, are the major reason for degraded magnet performance.This paper discribes a magnet design approach for controlling the frictional spring force in dry-wound solenoids. This method was applied to analyze the behaviors of two high-field NbTi test coils. Experimental results show that stabilization can be achieved by allowing all potential conductor motions to take place during the low field portion of the magnet's charge up sequence, where its quench energy margin is greatest.