High quality toroid and solenoid inductors, exhibiting quality factors as high as 87 at 14.5 GHz and 35 at 6.4 GHz are presented in this paper. The inductors are fabricated using only two plating ...

Image: US ITER. The central solenoid is 4.13 m across (that’s 13′ 7″ for burger enthusiasts) sits at the hole of the “doughnut” of the toroidal reactor.

Both of them can be easily calculated for a solenoid magnet, but if the magnet is toroidal shaped, it is practically impossible to calculate the magnetic energy analytically.