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

• Main Authors: Aghion, Stefano, Amsler, C, Ariga, A, Ariga, T, Belov, AS, Bonomi, G, Bräunig, P, Bremer, J, Brusa, RS, Cabaret, L, Caccia, M, Caravita, R, Castelli, F, Cerchiari, G, Chlouba, K, Cialdi, S, Comparat, D, Consolati, G, Demetrio, A, Di Noto, L, Doser, M, Dudarev, A, Ereditato, A, Evans, C, Fesel, J, Fontana, A, Forslund, OK, Gerber, S, Giammarchi, M, Gligorova, Angela, Gninenko, S, Guatieri, F, Haider, S, Holmestad, Helga Margrete, Huse, Torkjell, Jernelv, IL, Jordan, E, Kaltenbacher, T, Kellerbauer, A, Kimura, M, Koetting, T, Krasnicky, D, Lagomarsino, V, Lebrun, P, Lansonneur, P, Lehner, S, Liberadzka, J, Malbrunot, C, Mariazzi, S, Marx, L, Matveev, V, Mazzotta, Z, Nebbia, G, Nedelec, P, Oberthaler, M, Pacifico, Nicola, Pagano, D, Penasa, L, Petracek, V, Pistillo, C, Prelz, F, Prevedelli, M, Ravelli, L, Rienäcker, B, Røhne, Ole Myren, Rosenberger, S, Rotondi, A, Sacerdoti, M, Sandaker, Heidi, Santoro, R, Scampoli, P, Sorrentino, F, Spacek, M, Storey, J, Strojek, IM, Testera, G, Tietje, I, Vamosi, S, Widmann, E, Yzombard, P, Zavatarelli, S, Zmeskal, J
• Format: Article
• Language: English
• Subjects: Bunching; Positron; Positronium

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.