Progress towards a positron reaction microscope

The progress toward the construction of a positron reaction microscope is outlined. The design principles of an electrostatic lens system used to focus and transport the positron beam with a ∼ 1 mm diameter spot are briefly discussed. Also presented here are the results obtained from the characterisation of the supersonic gas jet assembly, an increased peaking factor of ∼ 4 has been observed along with a centerline density of ∼ 1012 cm-3.