This thread on the Polywell talk forum covers some of the challenges working with superconducting magnets. They are finicky and can quench easily. In summary: SC magnets must be brought up to current slowly; the cleanliness of the power supply is important; field overlaps in SC magnets increases the chance of quench, the Polywell shape will be especially challenging; movement between two charged magnets can cause quench.
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Prometheus Fusion Perfection 
[…] Finicky Superconductor […]
You might find this book of interest. If you haven’t seen it already:
Case Studies in Superconducting Magnets: Design and Operational Issues.
And this bit on room temperature superconductors. (so you can dream).
Room Temperature Superconductors One Step Closer
Thanks M. Simon!