Electromagnetic Design of Consecutive HTS Quadrupole Magnets for the Preseparator at RISP

The rare isotope science project (RISP) was established at the Institute for Basic Science, Daejeon, South Korea to construct a heavy ion acceleration facility for rare isotope beam production. The separators include two pre- and main separators. The central purpose of the preseparator is to remove the primary and unwanted isotope beams; radiation heating and shielding are the major design considerations. For a warm ion, the high-temperature superconducting (HTS) dipole magnet will be used in the front region of the preseparator, and six HTS quadrupole magnets will be installed consecutively. In this paper, we present the electromagnetic design details and the specifications of the consecutive HTS quadrupole magnets for the preseparator at the RISP. Metal (Stainless steel 316) insulated magnets were designed to include iron cores. Using the finite-element method tool, six HTS magnets were modeled and simulated. The operational characteristics including the field gradient, effective length, and uniformity of each magnet were analyzed and presented as well. The research outcomes will be useful for the actual construction of a heavy ion acceleration facility in South Korea.