Nemulodi, F. Broodryk, J.I. Conradie, J.L. De Villiers, J.G. Duckitt, W. Fourie, D.T. Mira, J. Thomae, R.W. Van Niekerk, M.J. Yang, J.J. Zhang, T.J. JACoW Geneva, Switzerland 978-3-95450-167-0 10.18429/JACoW-Cyclotrons2016-MOP11 English 75-78 MOP11 ion cyclotron bunching space-charge simulation Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-Cyclotrons2016-MOP11 http://jacow.org/cyclotrons2016/papers/mop11.pdf The transmission efficiency of some ion beams through the second solid-pole injector cyclotron (SPC2) at iThemba LABS requires improvement. In order to understand the beam optics in the injection line, and match the beam to the acceptance of the cyclotron, the beam envelope behaviour from the beginning of injection-line to the inside of the SPC2 cyclotron was investigated with different simulation programs. The transverse effects were taken into account by the beam transport codes TRANSOPTR and TRANSPORT, while the multi particle simulation code OPAL was used to include space-charge effects. Simulations of the effect of an additional buncher, operating at the second harmonic, on the transmission of the beam of charged particles through the cyclotron were made.