/ Experiment-Nucl

Characterization of a transmission positron/positronium converter for antihydrogen production

Aghion, S. (INFN, Milan) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Ariga, T. (U. Bern, AEC) ; Bonomi, G. (INFN, Pavia) ; Brusa, R.S. (TIFPA-INFN, Trento) ; Caccia, M. (Insubria U., Como) ; Caravita, R. (INFN, Genoa) ; Castelli, F. (Milan U.) ; Cerchiari, G. (Heidelberg, Max Planck Inst.) ; Comparat, D. (LAC, Orsay) ; Consolati, G. (INFN, Milan) ; Demetrio, A. (Kirchhoff Inst. Phys.) ; Di Noto, L. (INFN, Genoa) ; Doser, M. (CERN) ; Ereditato, A. (U. Bern, AEC) ; Evans, C. (INFN, Milan) ; Ferragut, R. (INFN, Milan) ; Fesel, J. (CERN) ; Fontana, A. (INFN, Pavia) ; Gerber, S. (CERN) ; Giammarchi, M. (INFN, Milan) ; Gligorova, A. (Bergen U.) ; Guatieri, F. (TIFPA-INFN, Trento) ; Haider, S. (CERN) ; Hinterberger, A. (CERN) ; Holmestad, H. (Oslo U.) ; Kellerbauer, A. (Heidelberg, Max Planck Inst.) ; Krasnický, D. (INFN, Genoa) ; Lagomarsino, V. (INFN, Genoa) ; Lansonneur, P. (Lyon, IPN) ; Lebrun, P. (Lyon, IPN) ; Malbrunot, C. (Stefan Meyer Inst. Subatomare Phys.) ; Mariazzi, S. (INFN, Padua) ; Matveev, V. (Dubna, JINR) ; Mazzotta, Z. (Milan U.) ; Müller, S.R. (Kirchhoff Inst. Phys.) ; Nebbia, G. (INFN, Padua) ; Nedelec, P. (Lyon, IPN) ; Oberthaler, M. (Kirchhoff Inst. Phys.) ; Pacifico, N. (Bergen U.) ; Pagano, D. (INFN, Pavia) ; Penasa, L. (TIFPA-INFN, Trento) ; Petracek, V. (Prague, Tech. U.) ; Povolo, L. (TIFPA-INFN, Trento) ; Prelz, F. (INFN, Milan) ; Prevedelli, M. (U. Bologna (main)) ; Ravelli, L. (TIFPA-INFN, Trento) ; Resch, L. (CERN) ; Rienäcker, B. (CERN) ; Robert, J. (LAC, Orsay) ; Røhne, O.M. (Oslo U.) ; Rotondi, A. (Pavia U.) ; Sacerdoti, M. (Milan U.) ; Sandaker, H. (Oslo U.) ; Santoro, R. (Insubria U., Como) ; Scampoli, P. (Naples U.) ; Simon, M. (Stefan Meyer Inst. Subatomare Phys.) ; Smestad, L. (Res. Council, Norway) ; Sorrentino, F. (INFN, Genoa) ; Testera, G. (INFN, Genoa) ; Tietje, I.C. (CERN) ; Widmann, E. (Stefan Meyer Inst. Subatomare Phys.) ; Yzombard, P. (LAC, Orsay) ; Zimmer, C. (Kirchhoff Inst. Phys.) ; Zmeskal, J. (Stefan Meyer Inst. Subatomare Phys.) ; Zurlo, N. (INFM, Brescia) ; Andersen, S.L. (Aarhus U.) ; Chevallier, J. (Aarhus U.) ; Uggerhøj, U.I. (Aarhus U.) ; Lyckegaard, F. (Aarhus U.)

Published in: Nucl.Instrum.Meth.
Year: 2017
Vol.: B407
Page No: 55-66
Pages: 12
Year: 2017-09-15 published

Abstract: 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 $3-4·10^7$ 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.

Keyword(s): Positronium ; Transmission ; Antihydrogen

Total numbers of views: 337
Numbers of unique views: 168
DOI: 10.1016/j.nimb.2017.05.059
 Record created 2017-07-04, last modified 2017-07-04

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