Post accel mode refers to a mode of operation in which the ion beam energy is increased after the analysis magnet. The following schematic below shows an example and the table on the right indicates the energy of the beam at various points along the beam line designated by letters A-G Note all points are referenced to the source or point A.
| Point | Beam Energy |
| A | 0 keV |
| B | 10 keV |
| C | 25 keV |
| D | 20 keV |
| E | 20 keV |
| F | 55 keV |
| G | 50 keV |