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TY - CONF AU - Stursa, J. AU - Cihak, M. AU - Gotz, M. AU - Zach, V. ED - Chrin, Jan ED - Schaa, Volker RW TI - Physical Design of External Two-Stage Beam Chopping System on the TR 24 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 - We briefly introduce a new Cyclotron Laboratory of the Nuclear Physics Institute of the Czech Academy of Sciences with the new cyclotron TR 24 which was commissioned in October 2015. One of the planned utilization of TR 24 beams is a generation of high-intense fast neutrons fluxes with potential implementation of a chopping system for spectrometric measurements of neutron energy by the Time-of-Flight method. For this purpose, physical design of a new ion-optical beam line was completed as well as comprehensive study of an external fast chopping system on this beam line. A set of home-made programs DtofDeflect have been developed for this system consisting of the first chopper powered by sinusoidal voltage and the second chopper powered by pulse voltage. The programs allow to find the optimum geometric and voltage parameters of the system by the means of mathematical simulations. The chopping system can provide the external 24 MeV proton beam with 2.3 ns pulse length at a repetition period of 236 ns in order to comply with the required pulse length to the repetition period ratio of 1:100. PB - JACoW CP - Geneva, Switzerland SP - 45 EP - 48 KW - cyclotron KW - neutron KW - emittance KW - simulation KW - ion DA - 2017/01 PY - 2017 SN - 978-3-95450-167-0 DO - 10.18429/JACoW-Cyclotrons2016-MOP02 UR - http://jacow.org/cyclotrons2016/papers/mop02.pdf ER -