Well said about the “lossy crankshaft”. As for what determines Q, that’s up next, stay tuned :)

I will quote Prof. Dennis Whyte

"The limitations of 20+ year-old Nb3Sn superconductor magnet technology forces ITER to be so large it is taking the entire world to build a single device"

https://youtu.be/KkpqA8yG9T4?t=1471