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

S Aghion,C Amsler,A Ariga,T Ariga,A S Belov,G Bonomi,P Braunig,J Bremer,R S Brusa,L Cabaret,M Caccia,R Caravita,F Castelli,G Cerchiari,K Chlouba,S Cialdi,D Comparat,G Consolati,A Demetrio,L Di Noto,M Doser,Alexey Dudarev,A Ereditato, Cynthia A Evans,J Fesel,A Fontana,O K Forslund,Susan I Gerber,M Giammarchi,A Gligorova,S Gninenko,F Guatieri,Stefan Haider,H Holmestad,T Huse,I L Jernelv,E Jordan,T Kaltenbacher,A Kellerbauer,Makoto Kimura, T Koetting,D Krasnicky,V Lagomarsino,P Lebrun,P Lansonneur,S Lehner,J Liberadzka,C Malbrunot,S Mariazzi, L D Marx,Viktor Matveev,Z Mazzotta,G Nebbia,P Nedelec,M K Oberthaler,N Pacifico,D Pagano,L Penasa,V Petracek,C Pistillo,F Prelz,M Prevedelli,L Ravelli,B Rienacker,O Rohne,S Rosenberger,A Rotondi,M Sacerdoti,H Sandaker,R Santoro,P Scampoli,Francesco Sorrentino,Michal Spacek,J W Storey,I M Strojek,G Testera,I Tietje,S Vamosi,E Widmann,P Yzombard,S Zavatarelli,J Zmeskal

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms（2015）

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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 0.085T 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 4mm FWTM in bunches of ∼8ns FWHM. Emission of positronium into the vacuum is shown by single shot positron annihilation lifetime spectroscopy.

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Key words

Positron,Positronium,Bunching

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