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Design study of the injection and extraction elements for the RIKEN superconducting ring cyclotron

The injection system for the RIKEN 6-sector superconducting ring cyclotron (SRC) consists of four bending magnets (BM1, BM2, BM3, BM4), three magnetic inflection channels (MIC1, MIC2, MIC3), and an electrostatic inflection channel (EIC). The four bending magnets and one of the three magnetic channels are superconducting. In this paper, the status of the design study of the BM1 is reported.