Characterization of a transmission positron/positronium converter for antihydrogen production

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. GerberM. 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. Prevedelli, 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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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 ∼1 μm thick ultraporous silica film e-gun evaporated onto a 20 nm 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 10 ns 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 3.3 keV are forward-emitted with a scattering angle smaller than 50° and maximum kinetic energy of 1.2 keV. 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.

Original languageEnglish
Pages (from-to)55-66
Number of pages12
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Publication statusPublished - Sept 15 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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