I have put the superconducting magnet into a persistent state!!!!!
Power supplies off, magnet still going!
Details to follow.
OK. Here it is. The units are in raw volts coming from the magnetometer and the current sensing resistor (0.008 ohms). The red is the current going into the superconducting coil, the white is the magnetic field. You can see that the current drops off, but the magnetic field persists. WIN!!!!
The magnetic field gradually falls off over the course of an hour.
This is the setup:
SC coil in the dewar:
Here is the schematic:
It was all controlled manually by switching the power supplies on and off.