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As helium ion source, the periodic focusing structure model of Helium ion (He+) FFAG (Fixed-Field Alternating Gradient) accelerator was designed, providing He+ beam with higher beam current at a lower cost, which could be used for the study of the impact of Helium embitterment on fusion reactor envelope material. A radial sector scaling FFAG accelerator type with eight super-periods and a conventional magnetic lattice structure, a triplet focusing lattice-DFD combination, is adopted for He+ FFAG accelerator. In this paper, magnetic lattice is optimizing by analytical and numerical techniques. A large-aperture magnet is designed by using a 3D magnetic field simulation code OPERA-3D. Runge-Kutta tracking code used specifically for FFAG accelerator based on MATLAB language was used to track the particle in the magnetic field generated by OPERA-3D, followed by linear and nonlinear beam dynamics study. Some results of magnet design, particle tracking and dynamics study are presented in the article.
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