Wang, X.W. Yong, F. Zhang, R. JACoW Geneva, Switzerland 978-3-95450-167-0 10.18429/JACoW-Cyclotrons2016-TUP27 English 227-228 TUP27 cavity cyclotron simulation extraction ion Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-Cyclotrons2016-TUP27 http://jacow.org/cyclotrons2016/papers/tup27.pdf In the cyclotron, RF system as an essential component provides energy for the ions is accelerated. However, the RF cavity is the most important equipment which produced the accelerating field. According to the physical requirements, RF cavity, the resonant frequency of that is 31.02 MHz, was designed in the paper.