Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum

Amsler, Claude; Ariga, Akitaka; Ariga, Tomoko; Ereditato, Antonio; Kaltenbacher, Thomas Roland; Kimura, Mitsuhiro; Pistillo, Ciro; Scampoli, Paola; Storey, James William (2015). Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 362, pp. 86-92. Elsevier 10.1016/j.nimb.2015.08.097

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We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied by a positron source and a Surko-trap. Positron pulses from the accumulator are magnetically guided in a 0.085 T field and are injected into a region free of magnetic fields through a μ -metal field terminator. Here positrons are temporally compressed, electrostatically guided and accelerated towards a porous silicon target for the production and emission of positronium into vacuum. Positrons are focused in a spot of less than 4 mm FWTM in bunches of ∼8 ns FWHM. Emission of positronium into the vacuum is shown by single shot positron annihilation lifetime spectroscopy.

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