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TY - CONF AU - Kostromin, S.A. AU - Cahay, P. AU - Gurskiy, S. AU - Jongen, Y. AU - Karamysheva, G.A. AU - Kazarinov, M.Y. AU - Korovkin, S.A. AU - Mokrenko, S.P. AU - Morozov, N.A. AU - Olshevsky, A.G. AU - Paradis, Y. AU - Romanov, V.M. AU - Samsonov, E. AU - Shakun, N.G. AU - Shirkov, G. AU - Shirkov, S.G. AU - Syresin, E. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Cyclotron C235-V3 for Dimitrovgrad Hospital Center of the Proton Therapy J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - JINR-IBA C235-V3 isochronous cyclotron for 1st Russian hospital center of the proton therapy has been assembled and tested. Shimming of the magnetic field, optimization of the acceleration modes and testing with the extracted proton beam were done in frame of this work. The paper presents experimental results of the beam dynamics in the accelerator. Proton transmission from radius 30cm to 103cm is 72% without beam cutting diaphragms. The extraction efficiency is 62%. This cyclotron is a substantially modified version C235-V3 of the IBA C235 serial cyclotron. C235-V3 has the improved extraction system which was constructed and tested. This system allows raise the extraction efficiency up to 77% from 50% in comparison with serial C235. Special mapping system (for Br-component) of the magnetic field was developed and constructed by JINR for the shimming of the Br-field in the middle plane of the cyclotron. Total efficiency of the machine is 45%. Further improvement of the parameters expected after final tuning of the cyclotron in Dimitrovgrad. PB - JACoW CP - Geneva, Switzerland SP - 2703 EP - 2705 KW - cyclotron KW - proton KW - extraction KW - acceleration KW - focusing DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-WEPRI090 UR - http://jacow.org/ipac2014/papers/wepri090.pdf ER -