Steady Inductive Helicity Injection and Its Application to a High-Beta Spheromak

A steady inductive helicity injection (SIHI) method is described that has the following properties: (a) helicity is injected at a nearly constant rate; (b) neither magnetic energy nor helicity flow out of plasma at any time; (c) no open field lines penetrate the walls; (d) the equilibrium is produced in a close-fitting flux conserver; (e) a rotating magnetic structure is produced directly; and (f) in the frame of the rotating field, the current profile is nearly time independent and nearly optimum for the application discussed. SIHI can be applied to any toroidal plasma. Application of SIHI to a high-beta spheromak is described.