Beam Injection Experiments using Space Charge Lenses

Space charge lenses for ion beam focussing are in theory, especially for singly charged heavy ion beams at low velocities, superior to other lens systems [1]. On the other hand previous experiments [2] have shown, in contrary to the theoretical forecast, a small degree of lens filling and serious emittance growth. Newer experiments [3] demonstrated a much better degree of lens filling and substantially lower emittance growth. Therefore an injector to study the injection of a space charge dominated ion beam into an RFQ is under construction. The schematic layout of the experiment is shown in fig. 1. As reported previously [4] the ion source and LEBT system is operational, and the beam was matched to the injection point of the RFQ.