Magnetically Confined Kinetic-Energy Storage Ring (1984)

[pfdietz]

https://digital.library.unt.edu/ark:/67531/metadc173309/

[pfdietz]

An improved version of the idea was described in 1987 using passively stable attractive levitation (stabilized by the alternating gradient principle.)

https://www.semanticscholar.org/paper/Magnetically-Confined-...

The attractive feature of these concepts is that cost scales linearly with radius, but energy stored scales as radius squared.