I re-spooled the YBCO on it’s original spool. Hoping for a stronger magnet and less liquid nitrogen.
We ran 2A DC through the coil at room temperature and David searched for the strongest point of the field.
Which turned out to be the very center, perhaps amplified by the ferrous steel screw:
In this configuration we are seeing ~140 gauss magnetic field while running 5A DC current through the SC magnet submerged in liquid nitrogen (with no persistent switch short circuit):
Next we re-fabricated the persistent switch… this time using a much longer splice, better soldering, and a longer heater directly over the splice:
We also included some heat shrink tubing to insulate the heater:
We will test this again today!