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TY - CONF AU - Nakao, M. AU - Fukuda, M. AU - Hara, S. AU - Hara, T. AU - Hatanaka, K. AU - Kamakura, K. AU - Kanda, H. AU - Koay, H.W. AU - Morinobu, S. AU - Morita, Y. AU - Nagayama, K. AU - Saito, T. AU - Takeda, K. AU - Tamura, H. AU - Yasuda, Y. AU - Yorita, T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Extraction System of Upgraded AVF Cyclotron of RCNP J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The AVF cyclotron of RCNP have been utilized for the purposes of basic research in physics, RI production for medicine and industrial applications as well as injector of ring cyclotron. Increasing beam intensity without decreasing beam quality can make improvements in all purposes. The improvement and repair of the AVF cyclotron are being carried out currently. We designed the new LEBT, injection, acceleration and extraction systems and we report on the extraction system here. High extraction efficiency is indispensable when increasing the beam intensity since beam loss causes activation of apparatus. New extraction system consists of deflector electrodes and two gradient correctors and probes. One gradient corrector causes a horizontally focus effect on the beam and the other causes horizontally defocus effect to avoid spreading of the beam with strong defocus effect caused by the main cyclotron magnetic field. Simulation study confirmed that 10 MeV proton, 65 MeV proton and 140 MeV alpha particles with 2 mm × 3 mrad could pass through the newly designed extraction system and the existing beam transport line. Beam simulation has been performed by utilizing SNOP* and OPAL** codes. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1993 EP - 1996 KW - proton KW - extraction KW - cyclotron KW - septum KW - injection DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS028 UR - http://jacow.org/ipac2019/papers/tupts028.pdf ER -