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.
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. Bräunig, 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, A. Dudarev, A. Ereditato, C. Evans, J. Fesel, A. Fontana, O.K. Forslund, S. Gerber, M. Giammarchi, A. Gligorova, S. Gninenko, F. Guatieri, S. Haider, H. Holmestad, T. Huse, I.L. Jernelv, E. Jordan, T. Kaltenbacher, A. Kellerbauer, M. Kimura, T. Koetting, D. Krasnicky, V. Lagomarsino, P. Lebrun, P. Lansonneur, S. Lehner, J. Liberadzka, C. Malbrunot, S. Mariazzi, L. Marx, V. Matveev, Z. Mazzotta, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, D. Pagano, L. Penasa, V. Petracek, C. Pistillo, F. Prelz, M. Prevedelli, L. Ravelli, B. Rienäcker, O.M. Røhne, S. Rosenberger, A. Rotondi, M. Sacerdoti, H. Sandaker, R. Santoro, P. Scampoli, F. Sorrentino, M. Spacek, J. Storey, I.M. Strojek, G. Testera, I. Tietje, S. Vamosi, E. Widmann, P. Yzombard, S. Zavatarelli, J. Zmeskal. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS. - ISSN 0168-583X. - 362(2015 Nov), pp. 86-92. [10.1016/j.nimb.2015.08.097]
Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum
F. Castelli;S. Cialdi;M. Giammarchi;Z. Mazzotta;F. Prelz;M. Sacerdoti;
2015
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 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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