Superconducting magnets and power supplies for superconducting devices

An apparatus for supplying power to a superconducting load, the apparatus comprising:

• a first cryogenic region at a high temperature superconducting (HTS) temperature;
• a current source including:
• a first induction coil disposed outside the cryogenic region for generating magnetic flux in response to an applied alternating current;
• and
• a second induction coil disposed within the cryogenic region for generating alternating current in response to magnetic flux generated by the first induction coil;
• a monitor for determining a current flow through the superconducting load;
• and
• a first switching device in series between the current source and the superconducting load for transferring current from the current source to the superconducting load when the monitor detects that the current flow through the superconducting load is below a predetermined level, the first switching device comprising a metal oxide semiconductor field effect transistor (MOSFET) device disposed in the first cryogenic region.

A superconducting magnet comprising:

• a current source;
• a superconducting coil;
• a first cryogenic region at a high temperature superconducting (HTS) temperature;
• a monitor for determining a current flow through the superconducting coil;
• and
• a first switching device in series between the current source and the superconducting coil for transferring current from the current source to the superconducting coil when the monitor detects that the current flow through the superconducting coil is below a predetermined level, the first switching device comprising a metal oxide semiconductor field effect transistor (MOSFET) device disposed in the first cryogenic region.

A superconducting magnet for supplying power to a superconducting coil, the superconducting magnet comprising:

• a first cryogenic region at a high temperature superconducting (HTS) temperature;
• a current source including:
• a first induction coil disposed outside the cryogenic region for generating magnetic flux in response to an applied alternating current;
• and
• a second induction coil disposed within the cryogenic region for generating alternating current in response to magnetic flux generated by the first induction coil;
• a superconducting coil;
• a monitor for determining a current flow through the superconducting coil;
• and
• a first switching device in series between the current source and the superconducting coil for transferring current from the current source to the superconducting coil when the monitor detects that the current flow through the superconducting coil is below a predetermined level, the first switching device comprising a metal oxide semiconductor field effect transistor (MOSFET) device disposed in the first cryogenic region.