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Surface ionisation in a new type of hot cavity characterised by the shape of a truncated cone is considered in the paper. Influence of the hot cavity shape and its temperature on the ionisation efficiency of stable and long-lived nuclides is under investigation and the supremacy of elongated conical cavities is proven. The role of the extraction opening size is studied and its optimal diameter (≈ 1 mm) is found for the considered cavity shapes. It is shown that the extraction voltages of 1–2 kV are large enough to obtain high efficiencies and saturation of the current–voltage curves is observed above these values. Changes of ionisation effciency with the ioniser temperature are investigated — increase of ion yield with T is observed. It was proven that cold spots inside the ioniser cavity (near the extraction opening — in the considered case) can degrade ion source performance by several tens percent.

Ionisation Efficiency in Conical Hot Cavities