Design, Manufacture and Test of the Superconducting Quadrupole Triplet Magnet With Multi-Layered Direct-Wound Hexapole and Octupole Magnets

Currently, the Rare Isotope Science Project (RISP) of the Insti-tute for Basic Science (IBS) has been constructing a heavy ion ac-celerator facility, named RAON. For rare isotope science research in Korea, the RAON includes two different types of facilities; one is the isotope separation on-line, and another is the in-flight (IF) system. In the IF system, several types of magnets are located: dipole, quadrupole, hexapole, and octupole magnets. Among them, a superconducting quadrupole triplet magnet (SQTM) sys-tem has been developed since 2018 and to date, all SQTM systems have been manufactured and tested. In this paper, the design, manufacture, and commissioning test results of the SQTM sys-tems for the RAON are presented. This magnet consists of five magnets of three different kinds: three quadrupole magnets, a hexapole magnet, and an octupole magnet. All magnets were made by low-temperature superconducting (LTS) NbTi wires. For manufacturing the hexapole and octupole magnets with a multi-layer structure in a narrow space, the LTS wire was wound by the direct winding method.