Abstract

The drift-cyclotron loss-cone (DCLC) instability is driven by both the loss-cone velocity distribution of ions and the density gradient.The instability is most dangerous for mirror confinements. We investigate the stabilization mechanism by the radio frequency field, which suppressed the end loss. The Fokker-Planck equation is numerically computed under the boundary conditions for the end stopper effect. The distribution function deduced is used to calculate the dispersion equation of DCLC instability. It is estimated that the minimum energy of r.f. field to stabilize the instability is 60% of the ion thermal energy.

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