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

Abstract : 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 μμ-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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Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier, 2015, 362, pp.86-92. 〈10.1016/j.nimb.2015.08.097〉
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S. Aghion, C. Amsler, A. Ariga, T. Ariga, A.S. Belov, et al.. 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, Elsevier, 2015, 362, pp.86-92. 〈10.1016/j.nimb.2015.08.097〉. 〈in2p3-01258082〉

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