Abstract
The Surrey vertical beam is a new facility for targeted irradiation of cells in medium with singly counted ions. A duo-plasmatron ion source and a 2 MV Tandem accelerator supply a range of ions from protons to calcium for this beamline, with energy ranges from 0.5 to 12 MeV. A magnetic quadrupole triplet lens is used to focus the beam of ions. We present the design of this beamline, and early results showing the capability to count single ions with 98% certainty on CR-39 track etch. We also show that the beam targeting accuracy is within 5 microns and selectively target human broblasts with a <5 m carbon beam, using H2AX immuno uorescence to demonstrate which cell nuclei were irradiated. We discuss future commissioning steps necessary to achieve sub-micron targeting accuracy with this beamline.