therapy with heavy charged particles, Progr . Part. Nucl . Phys. (2000), https:// doi.org/10.1016/S0146-6410(00)00112-5 [5] Haberer et al., Nucl . Instrum . Methods Phys. Res. A (1993)] https:// doi.org/10 [...] org/10.1016/0168-9002(93)91335-K [6] Hall, Int. J. Radiat . Oncol . Biol. Phys . (2006) [7] Schardt et al, Heavy-ion tumor therapy: Physical and radiobiological benefits, Rev. Mod. Phys. (2010), https :// [...] conformity of modern photon therapy techniques is not sufficient, e.g. brain tumours or pediatric patients . Proton or ion beams can achieve better dose conformity than high-energy photons due to the underlying