Patent ID: 7064550

Claim:
A method for magnetic field drift compensation for a superconducting magnet system, the method comprising: electrically coupling a micro-flux injection system to a secondary B 0 superconducting coil in a secondary compensation circuit; magnetically coupling the secondary compensation circuit to the superconducting magnet via the secondary B 0 superconducting coil; switching the micro-flux injection system on and off to induce a first current from a flux coil of the secondary compensation circuit into the secondary B 0 superconducting coil producing a secondary field to compensate magnet field drift of the superconducting magnet, wherein the switching the micro-flux injection system on and off is either done one of thermally and magnetically; wherein the micro-flux system includes: a superconducting circuit loop having first and second legs connected in parallel to the secondary B 0 superconducting coil, the first and second legs defining the circuit loon and having the flux coil extending through the circuit loop, the first current in the flux coil inducing a second current in the circuit loop; and a trigger mechanism in communication with the first leg of the circuit loop, the trigger configured to quench the first leg and force the second current induced from the first current of the flux coil to the secondary B 0 superconducting coil via the second leg producing a secondary magnetic field proportionate to the second current; wherein a rate of field compensation by the secondary field is responsive to a frequency of an ON/OFF rate of the trigger.