IBS, Daejeon, Republic of Korea
ANL, Argonne, Illinois, USA
The rare isotope science project (RISP) under development in Korea aims to provide various heavy-ion beams for nuclear and applied science users. A pre-stripper linac is the first superconducting section to be constructed for the acceleration of both stable and radioisotope beams to the energy of 18.5 Mev/u with a DC equivalent voltage of 160 MV. The current baseline design consists of an ECR ion source, an RFQ, cryomodules with QWR and HWR cavities and quadruple focusing magnets in the warm sections between cryomodules. Recently we have developed an alternative design in collaboration with Argonne's Linac Development Group to layout the linac based on state-of-the-art ANL's QWR operating at 81.25 MHz and multi-cavity cryomodules of the type used for the ATLAS upgrade and Fermilab PIP-II projects. End-to-end beam dynamics calculations have been performed to ensure an optimized design with no beam losses. The numbers of required cavities and cryomodules are significantly reduced in the alternative design. The results of beam optics simulations and error sensitivity studies are discussed.
ANL, Argonne, Illinois, USA
The electron-ion collider being developed at JLAB requires a new ion accelerator complex which includes a linac capable of delivering any ion beam from hydrogen to lead to the booster. We are currently developing a linac which consists of several ion sources, a normal conducting (NC) front end, up to 5 MeV/u, and a SC section for energies > 5 MeV/u. The development work is focused on beam dynamics and electrodynamics studies to design efficient and cost-effective accelerating structures for both the NC and SC sections of the linac. Currently we are considering two RFQs following either heavy-ion sources or light-ion sources including polarized beams, and several different types of NC accelerating structures downstream of the RFQ. Quarter-wave and half-wave resonators can be effectively used in the SC section.