Henrotin, S. Abs, M. Forton, E. Jongen, Y. Kleeven, W.J.G.M. Verbruggen, P. van de Walle, J. JACoW Geneva, Switzerland 978-3-95450-167-0 10.18429/JACoW-Cyclotrons2016-TUP07 English 178-180 TUP07 emittance acceleration timing proton cyclotron Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-Cyclotrons2016-TUP07 http://jacow.org/cyclotrons2016/papers/tup07.pdf The first unit of the IBA superconducting synchrocyclotron (S2C2) has been installed in Nice, France, and is currently being commissioned. In this communication, we will present some issues encountered during the commissioning of our first synchrocyclotron for protontherapy. We will mainly focus on beam aspects, showing the influence of several machine parameters on beam properties like stability, energy and intensity.