Characterization of a transmission positron/positronium converter for antihydrogen production

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:407

Article

Aghion, S.^1,2  Amsler, C.^3,4  Ariga, T.³  Bonomi, G.^1,5,6  Brusa, R. S.^7,8  Caccia, M.^2,9  Caravita, R.^10,11  Castelli, F.^2,13  Cerchiari, G.¹⁴  Comparat, D.¹⁵  Consolati, G.²  Demetrio, A.¹⁶  Di Noto, L.^10,11  Doser, M.¹²  Ereditato, A.³  Evans, C.^1,2  Ferragut, R.^1,2  Fesel, J.¹²  Fontana, A.⁶  Gerber, S.¹²  Giammarchi, M.²  Gligorova, A.¹⁷  Guatieri, F.^7,8  Haider, S.¹²  Hinterberger, A.¹²  Holmestad, H.¹⁹  Kellerbauer, A.¹⁴  Krasnicliky, D.¹¹  Lagomarsino, V.^10,11  Lansonneur, P.²⁰  Lebrun, P.²⁰  Malbrunot, C.⁴  Mariazzi, S.^4,23  Matveev, V.^21,22  Mazzotta, Z.^2,13  Mueller, S. R.¹⁶  Nebbia, G.²³  Nedelec, P.²⁰  Oberthaler, M.¹⁶  Pacifico, N.¹⁷  Pagano, D.^5,6  Penasa, L.^7,8  Petracek, V.¹⁸  Povolo, L.^7,8  Prelz, F.²  Prevedelli, M.²⁴  Ravelli, L.^7,8  Resch, L.¹²  Rienacker, B.¹²  Robert, J.¹⁵  Rohne, O. M.¹⁹  Rotondi, A.^6,25  Sacerdoti, M.^2,13  Sandaker, H.¹⁹  Santoro, R.^2,9  Scampoli, P.^3,26  Simon, M.⁴  Smestad, L.^12,27  Sorrentino, F.^10,11  Testera, G.¹¹  Tietje, I. C.¹²  Widmann, E.^4,16  Yzombard, P.¹⁵  Zimmer, C.^12,14  Zmeskal, J.⁴  Zurlo, N.^6,28,30  Andersen, S. L.²⁹  Chevallier, J.³⁰  Uggerhoj, U. I.³⁰  Lyckegaard, F.³⁰ 

[1] Politecn Milan, Piazza Leonardo Vinci 32, I-20133 Milan, Italy

[2] INFN Milano, Via Celoria 16, I-20133 Milan, Italy

[3] Univ Bern, Albert Einstein Ctr Fundamental Phys, Lab High Energy Phys, CH-3012 Bern, Switzerland

[4] Austrian Acad Sci, Stefan Meyer Inst Subat Phys, Boltzmanngasse 3, A-1090 Vienna, Austria

[5] Univ Brescia, Dept Mech & Ind Engn, Via Bronze 38, I-25123 Brescia, Italy

[6] INFN Pavia, Via Bassi 6, I-27100 Pavia, Italy

[7] Univ Trento, Dept Phys, Via Sommarive 14, I-38123 Povo, Trento, Italy

[8] TIFPA INFN Trento, Via Sommarive 14, I-38123 Trento, Italy

[9] Univ Insubria, Dept Sci, Via Valleggio 11, I-22100 Como, Italy

[10] Univ Genoa, Dept Phys, Via Dodecaneso 33, I-16146 Genoa, Italy

[11] INFN Genova, Via Dodecaneso 33, I-16146 Genoa, Italy

[12] CERN, Phys Dept, CH-1211 Geneva 23, Switzerland

[13] Univ Milan, Dept Phys, Via Celoria 16, I-20133 Milan, Italy

[14] Max Planck Inst Nucl Phys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[15] Univ Paris 11, Univ Paris Saclay, CNRS, Lab Aime Cotton,ENS Cachan, F-91405 Orsay, France

[16] Heidelberg Univ, Kirchhoff Inst Phys, Im Neuenheimer Feld 227, D-69120 Heidelberg, Germany

[17] Univ Bergen, Inst Phys & Technol, Allegaten 55, N-5007 Bergen, Norway

[18] Czech Tech Univ, Brehova 7, Prague 11519 1, Czech Republic

[19] Univ Oslo, Dept Phys, Saelandsvei 24, N-0371 Oslo, Norway

[20] Univ Lyon 1, Inst Nucl Phys, CNRS, IN2P3, F-69622 Villeurbanne, France

[21] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[22] Joint Inst Nucl Res, Dubna 141980, Russia

[23] INFN Padova, Via Marzolo 8, I-35131 Padua, Italy

[24] Univ Bologna, Viale Berti Pichat 6-2, I-40126 Bologna, Italy

[25] Univ Pavia, Dept Phys, Via Bassi 6, I-27100 Pavia, Italy

[26] Univ Napoli Federico II, Complesso Univ Monte S Angelo, Dept Phys Ettore Pancini, I-80126 Naples, Italy

[27] Res Council Norway, PO Box 564, NO-1327 Lysaker, Norway

[28] Univ Brescia, Dept Civil Engn, Via Branze 43, I-25123 Brescia, Italy

[29] Danish Technol Inst, Kongsvang Atte 29, DK-8000 Aarhus, Denmark

[30] Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus, Denmark

关键词: Positronium;    Transmission;    Antihydrogen;   

DOI  :  10.1016/j.nimb.2017.05.059

来源: Elsevier

【 摘 要 】

In this work a characterization study of forward emission from a thin, meso-structured silica Received 17 March 2017 positron/positronium (Ps) converter following implantation of positrons in light of possible antihydrogen production is presented. The target consisted of a similar to 1 mu m 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 similar to 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. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free