Weisser, DavidFifield, L KeithKitchen, ThomasTunningley, ThomasLobanov, NikolaiMuirhead, Alistair2015-12-13September9780735411364http://hdl.handle.net/1885/84403The entrance of the accelerator tube in a large electrostatic accelerator imposes a strong lens that dominates the beam optics. The magnification of the lens is large because of the low injection energy, the high voltage gradient of the acceleration tubeKeywords: Accelerator entrance focusing; Beam Optics; Electrostatic acceleratorsTube entrance lens focus control201310.1063/1.47928222016-02-24