Method and apparatus for field drift compensation of a superconducting magnet

An apparatus for magnetic field drift compensation for a superconducting magnet system comprising:

• a micro-flux injection system;
• a secondary B0 superconducting coil electrically coupled to the micro-flux injection system in a secondary compensation circuit;
• and
• a flux coil in magnetic communication with the micro-flux injection system;
• wherein the secondary compensation circuit is magnetically coupled to the superconducting magnet via the secondary B0 superconducting coil, the micro-flux injection switches on and off to induce a first current from the flux coil into of the secondary compensation circuit and into the secondary B0 superconducting coil to compensate magnet field drift of the superconducting magnet, the micro-flux injection switches the micro-flux injection system on and off by either one of thermally and magnetically;
• wherein the micro-flux injection system includes:
• a superconducting circuit loon having first and so legs connected in parallel to the secondary B0 superconducting coil, the first and second legs defining the circuit loop 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 magnetic trigger in communication with the first leg of the circuit loop, the magnetic trigger configured to quench the first leg and force the second current induced from the first current of the flux coil to the secondary B0 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 magnetic field is responsive to a frequency of an ON/OFF rate of the trigger.

A superconducting magnet electrical circuit comprising:

• a superconducting coil assemblage including a main coil and a shielding coil connected in series;
• at least one quench resistor circuit connected in parallel with the superconducting coil assemblage;
• a superconductive switch coupled with the superconducting coil assemblage;
• a micro-flux injection system;
• a secondary B0 superconducting coil electrically coupled to the micro-flux flux injection system in a secondary compensation circuit;
• and
• a flux coil in magnetic communication with the micro-flux flux injection system;
• wherein the secondary compensation circuit is magnetically coupled to the superconducting magnet via the secondary B0 superconducting coil, the micro-flux injection system switches on and off to induce a first current from the flux coil into of the secondary compensation circuit and into the secondary B0 superconducting coil to compensate magnet field drift of the superconducting magnet, the micro-flux injection system switches the micro-flux injection system on and off by either one of thermally and magnetically;
• wherein the micro-flux flux injection system includes:
• a superconducting circuit loop having first and second legs connected in parallel to the secondary B0 superconducting coil, the first and second legs defining the circuit loop 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 B0 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.