BEAM DYNAMICS STUDIES ON THE ISAC-II POST-ACCELERATOR AT TRIUMF

The TRIUMF/ISAC facility, now a world leader in rare isotope production and acceleration, is constructing ISAC-II [1, 2], that will allow the acceleration of ion beams with 3 ≤ A/q ≤ 7 to an energy of at least 6.5 MeV/u for masses up to 150. The upgrade will include the addition of a su-perconducting heavy-ion linac delivering an effective volt-age of 43 MV. The first order design of the new transfer lines and post-accelerator have been optimized to provide simultaneous acceleration of several charge states (multi-charge). The quarter wave resonators providing the accel-eration have inherent rf electric and magnetic asymmetric components that complicate multi-charge acceleration and can lead to transverse emittance growth. In particular we report the realistic field simulations of the medium beta section of the SC-DTL for multi-charge acceleration.