In order to treat tumors with protons, an accelerator is required i.e., a device that increases the speed and therefore the energy of the protons. Current existing systems use two different types of accelerators – cyclotrons or synchrotrons – which nowadays are deemed as a mature technology.
Cyclotrons represent the oldest technology and are still widely used worldwide.
Synchrotrons are a more advanced type of technology, yet they have a significant bulkiness and are also expensive.
The ERHA system on the other hand uses a p-Linac i.e., a linear acceleration system that can be easily placed in a container of about 24 m. in length and only 4 m. in width. Furthermore, the p-Linac has a more advanced technology than a cyclotron and combines many of the advantages of a synchrotron with greater cost-efficiency.