1988 年 57 巻 11 号 p. 3809-3819
The effects of the flux hole on the magnetohydrodynamic (MHD) stability of the spheromak are investigated. The plasma is assumed to be confined in a drum-type flux conserver and is assumed to be in a force-free magnetic field. A numerical code to integrate the linearized MHD equation is developed and the linear growth rates of the n=1 mode are evaluated as functions of the flux-hole size and the prolateness parameter L⁄R. Here n is the toroidal mode number, and L and R denote the height and the radius of the flux conserver. The results of computations show that the flux hole has the destabilizing effects, but stable configurations exist when the flux hole is small and the flux conserver is oblate enough to satisfy L⁄R\lesssim1.8±0.1.
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