Zaremba, S. Abs, M. Delvaux, J.L. Kleeven, W.J.G.M. Nactergal, B. Nuttens, V. van de Walle, J. JACoW Geneva, Switzerland 978-3-95450-167-0 10.18429/JACoW-Cyclotrons2016-TUP06 English 175-177 TUP06 cyclotron vacuum cavity proton acceleration Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-Cyclotrons2016-TUP06 http://jacow.org/cyclotrons2016/papers/tup06.pdf The IBA CYCLONE®70p is a high intensity 70 MeV proton-only cyclotron dedicated to the production of radioisotopes for PET generators and SPECT. The nominal power of the extracted beam goes above 50kW (750μA@70MeV). The proton-only cyclotron was developed based on the previous experience of the multi-particle Cyclone® 70XP running in Nantes, France. Numerical tools have been extensively used to optimize the magnetic field, to avoid potentially harmful resonances during acceleration and improve the acceleration efficiency of the cyclotron. In addition, electromagnetic and mechanical calculations permitted to obtain a low dissipated power and electromechanically robust design of the RF system. The vacuum computations have permitted to optimize the beam transmission, the placement and type of cryopumps. This new development of CYCLONE®70p was the initial part of the successfully finished IBA project also presented during this conference [1].