Abstract
A compact and light weight injector system for a Van de Graaff accelerator has been developed. The system consists of a microwave ion source, an Einzel lens and a mass filter with crossed electrical and magnetic fields (Wien filter). The microwave ion source is a modified version of the source developed by Ishikawa [1]. The Wien filter of the injector system is a modified version of a Wien filter developed by Cleff and Schulte [2]. Typical beam currents are for example 100 μA of B + and 160 μA of Ar +. Other characteristics of the injector system are a stable beam current during at least eight hours even with reactive gases like oxygen, a lifetime of the antenna of at least 50 h, a small power consumption of the injector system of about 1 kW, including the ion source, and dimensions and weight which are small enough to mount the injector system in the terminal of a Van de Graaff accelerator.
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