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TY - CONF AU - Zhang, D.S. AU - Li, M. AU - Wang, C. AU - Yang, J.J. AU - Zhang, T.J. ED - Chrin, Jan ED - Schaa, Volker RW TI - Physical Design of the Extraction Trim-Rods in a 230 MeV Superconducting Cyclotron J2 - Proc. of Cyclotrons2016, Zurich, Switzerland, September 11-16, 2016 C1 - Zurich, Switzerland T2 - International Conference on Cyclotrons and Their Applications T3 - 21 LA - english AB - Two electrostatic deflectors are used for beam extraction of the 230 MeV superconducting cyclotron CYCIAE-230, which is under development at CIAE. Resonance crossing and processional motion are introduced by a first harmonic bump of main field during the beam dynamics design to increase the turn separation and accordingly the extraction efficiency. Four trim-rods of variable depth are employed to generate the desirable field bump for their stability, the amplitude and azimuth of first harmonic bump can be adjusted with different size and depth of trim-rods. However, effect on isochronous field in acceleration region is followed by trim-rods in practice, therefore the base depth of trim-rods need to be designed and re-shimming procedure of main magnet model need to be implemented interactively. The effect of trim-rods and isochronous field production by a new model will be presented in this paper. PB - JACoW CP - Geneva, Switzerland SP - 61 EP - 63 KW - extraction KW - cyclotron KW - acceleration KW - proton KW - feedback DA - 2017/01 PY - 2017 SN - 978-3-95450-167-0 DO - 10.18429/JACoW-Cyclotrons2016-MOP06 UR - http://jacow.org/cyclotrons2016/papers/mop06.pdf ER -