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TY - CONF AU - Matlocha, T. ED - Conradie, Lowry ED - De Villiers, John Garrett ED - Schaa, Volker RW TI - Deflecting System Upgrade Initial Simulations for 37 MeV Cyclotron at NPI Řež J2 - Proc. of Cyclotrons2019, Cape Town, South Africa, 23-27 September 2019 CY - Cape Town, South Africa T2 - International Conference on Cyclotrons and their Applications T3 - 22 LA - english AB - NPI Řež U-120M multi-particle variable energy cyclotron system for positive ions extraction consists of three electrostatic deflectors, one active magnetic channel and an electromagnetic bump exciter. The deflectors transmission ratio for deuterons, alpha particles and Helium 3 ions is rather low, usually about 10%, for protons it is far below 5%. Based on an experience from other cyclotron laboratories, the general concept of the extraction system has been modified and the last two electrostatic deflectors were replaced with two magnetic channels. In the early stage of the upgrade, simulations were performed for protons at 28 MeV and Helium 3 ions at 44 MeV with and without the magnetic bump exciter. The extraction efficiency and beam losses along the extraction path are evaluated. The presented modified extraction system simulations suggest promising results. The total transmission ratio of the deflecting system has increased significantly, allowing work to continue and expect a positive final result. PB - JACoW Publishing CP - Geneva, Switzerland SP - 185 EP - 188 KW - extraction KW - cyclotron KW - septum KW - simulation KW - proton DA - 2020/06 PY - 2020 SN - 978-3-95450-205-9 DO - doi:10.18429/JACoW-Cyclotrons2019-TUP014 UR - http://jacow.org/cyclotrons2019/papers/tup014.pdf ER -