Characterization of volume type ion source for p, and beams

Recently, there is an increasing need for H 2 + and H 3 + ion sources. One example is ion therapy facilities, where C 4 + and H 3 + ion beams along the linac are of great interest. Another example is a H 2 + test beam for linacs finally operated with intense deuteron beams. At Frankfurt, a simple proton ion source is needed to test a new kind of beam injection into a magnetic storage ring [N. Joshi, et al., Beam transport in toroidal magnetic field, EPAC’08, Genoa, June 2008 〈 http://www.jacow.org 〉 , to be published [1]; M. Droba, et al., Design studies on a novel stellarator type high current ion storage ring, EPAC’06, Edinburgh, June 2006, pp. 297–299 〈 http://www.jacow.org 〉 [2]]. This article describes a volume type ion source which can deliver up to 3.05 mA beam current at 10 keV in stable dc operation. It is a hot filament driven ion source which can provide high fractions of p, H 2 + or H 3 + , depending on the operation settings.