The Ion Beam Spectrometer (IBS) was part of the Cassini Plasma Spectrometer - CAPS investigation (Young et al. 2004) sent to Saturn aboard the Cassini spacecraft.

IBS was designed to measure ion velocity distributions with a high angular and energy resolution, with a mind to measure highly directional rammed ion fluxes encountered in Titan’s ionosphere.

IBS made valuable observations during close encounters of Saturn’s moon Enceladus, complementing the ion, charged dust and electron measurements made by the CAPS ELS & IMS sensors within the moon’s plumes.

The design of IBS combined with the cold background of the plume has the potential to provide higher resolution ion mass data than previously studied.

We present our initial analysis of previously unpublished IBS data from the E7 encounter in combination with the ELS & IMS data, concentrating on the composition of the ion populations detected whilst also commenting on other features observed.