Characterization of a transmission positron/positronium converter for antihydrogen production

In this work a characterization study of forward emission from a thin, meso-structured silica positron/positronium (Ps) converter following implantation of positrons in light of possible antihydrogen production is presented. The target consisted of a ∼1μm thick ultraporous silica film e-gun evaporat...

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Hauptverfasser: Aghion, Stefano (VerfasserIn) , Demetrio, Andrea (VerfasserIn) , Müller, Simon R. (VerfasserIn) , Oberthaler, Markus K. (VerfasserIn) , Zimmer, Christoph (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 6 June 2017
In: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
Year: 2017, Jahrgang: 407, Pages: 55-66
ISSN:1872-9584
DOI:10.1016/j.nimb.2017.05.059
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1016/j.nimb.2017.05.059
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0168583X17306596
Volltext
Verfasserangaben:S. Aghion, C. Amsler, T. Ariga, G. Bonomi, R.S. Brusa, M. Caccia, R. Caravita, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, A. Ereditato, C. Evans, R. Ferragut, J. Fesel, A. Fontana, S. Gerber, M. Giammarchi, A. Gligorova, F. Guatieri, S. Haider, A. Hinterberger, H. Holmestad, A. Kellerbauer, D. Krasnický, V. Lagomarsino, P. Lansonneur, P. Lebrun, C. Malbrunot, S. Mariazzi, V. Matveev, Z. Mazzotta, S.R. Müller, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, D. Pagano, L. Penasa, V. Petracek, L. Povolo, F. Prelz, M.Rerevedelli, L. Ravelli, L. Resch, B. Rienäcker, J. Robert, O.M. Røhne, A. Rotondi, M. Sacerdoti, H. Sandaker, R. Santoro, P. Scampoli, M. Simon, L. Smestad, F. Sorrentino, G. Testera, I.C. Tietje, E. Widmann, P. Yzombard, C. Zimmer, J. Zmeskal, N. Zurlo, S.L. Andersen, J. Chevallier, U.I. Uggerhøj, F. Lyckegaard

MARC

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520 |a In this work a characterization study of forward emission from a thin, meso-structured silica positron/positronium (Ps) converter following implantation of positrons in light of possible antihydrogen production is presented. The target consisted of a ∼1μm thick ultraporous silica film e-gun evaporated onto a 20nm carbon foil. The Ps formation and emission was studied via Single Shot Positron Annihilation Lifetime Spectroscopy measurements after implantation of pulses with 3-4·107 positrons and 10ns temporal width. The forward emission of implanted positrons and secondary electrons was investigated with a micro-channel plate - phosphor screen assembly, connected either to a CCD camera for imaging of the impinging particles, or to a fast photomultiplier tube to extract information about their time of flight. The maximum Ps formation fraction was estimated to be ∼10%. At least 10% of the positrons implanted with an energy of 3.3keV are forward-emitted with a scattering angle smaller than 50° and maximum kinetic energy of 1.2keV. At least 0.1-0.2 secondary electrons per implanted positron were also found to be forward-emitted with a kinetic energy of a few eV. The possible application of this kind of positron/positronium converter for antihydrogen production is discussed. 
650 4 |a Antihydrogen 
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650 4 |a Transmission 
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