ISLA Preliminary Design Performance

The Isochronous Separator with Large Acceptance (ISLA) was identified by the ReA12 Recoil Separator working group of the FRIB Users Organization as the single device that meets the needs of all the physics cases proposed by the community for studies with reaccelerated rare isotope beams from ReA at FRIB. ReA will reaccelerate stopped FRIB beams to energies ideal for transfer reactions, multiple Coulomb excitation, fusion, and deep inelastic scattering. ISLA will provide efficient rejection of unreacted beam; large acceptances of momentum (±10%), angle (64 msr), and charge state (±10%) distributions; and high M/Q resolving power (>400) for reaction products. The purely magnetic system will accept magnetic rigidities up to 2.5Tm, to match ReA12 incoming beam rigidities and have no electric rigidity limit. M/Q separation in time-of-flight and a long preceding drift will allow efficient detection at a compact focal plane. Recent progress will be presented on the optimization of the magnetostatic design of the four large multi-function ISLA dipoles, the performance of the current designs in advanced Monte Carlo simulations of ISLA, and the evaluation of design alternatives for tunable quadrupole field components.