ACTA

Hybrid Imaging and Timing Ps Laser Excitation Diagnostics for Pulsed Antihydrogen Production

R. Caravita^a, M. Antonello^{b, c}, A. Belov^d, G. Bonomi^{e, f}, R.S. Brusa^{g, h}, M. Caccia^{b, c}, A. Camper^a, F. Castelli^{b, i}, D. Comparat^j, G. Consolati^{b, k}, A. Demetrio^l, L. Di Noto^{m, n}, M. Doser^a, M. Fanì^{a, m, n}, R. Ferragut^{b, k}, S. Gerber^a, M. Giammarchi^b, A. Gligorova^o, L.T. Glöggler^a, F. Guatieri^{g, h}, S. Haider^a, A. Hinterberger^a, O. Khalidova^a, D. Krasnickýⁿ, V. Lagomarsino^{m, n}, C. Malbrunot^a, S. Mariazzi^{g, h}, V. Matveev^{d, p}, S.R. Müller^l, G. Nebbia^q, P. Nedelec^r, M. Oberthaler^l, E. Oswald^a, D. Pagano^{e, f}, L. Penasa^{g, h}, V. Petracek^s, F. Prelz^b, B. Rienäcker^a, O.M. Røhne^t, A. Rotondi^{f, u}, H. Sandaker^t, R. Santoro^{b, c}, G. Testeraⁿ, I. Tietje^a, V. Toso^{b, k}, T. Wolz^a, C. Zimmer^a, N. Zurlo^{f, v}
^aPhysics Department, CERN, 1211 Geneva 23, Switzerland
^bINFN Milano, via Celoria 16, 20133, Milano, Italy
^cDepartment of Science, University of Insubria, Via Valleggio 11, 22100 Como, Italy
^dInstitute for Nuclear Research of the Russian Academy of Science, Moscow 117312, Russia
^eDepartment of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
^fINFN Pavia, via Bassi 6, 27100 Pavia, Italy
^gDepartment of Physics, University of Trento, via Sommarive 14, 38123 Povo, Trento, Italy
^hTIFPA/INFN Trento, via Sommarive 14, 38123 Povo, Trento, Italy
ⁱDepartment of Physics, University of Milano, via Celoria 16, 20133 Milano, Italy
^jLaboratoire Aimé Cotton, Université Paris-Sud, ENS Cachan, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France
^kPolitecnico of Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
^lKirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
^mDepartment of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy
ⁿINFN Genova, via Dodecaneso 33, 16146 Genova, Italy
^oStefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
^pJoint Institute for Nuclear Research, 141980 Dubna, Russia
^qINFN Padova, via Marzolo 8, 35131 Padova, Italy
^rInstitute of Nuclear Physics, CNRS/IN2p3, University of Lyon 1, 69622 Villeurbanne, France
^sCzech Technical University, Prague, Bøehová 7, 11519 Prague 1, Czech Republic
^tDepartment of Physics, University of Oslo, Semælands vei 24, 0371 Oslo, Norway
^uDepartment of Physics, University of Pavia, via Bassi 6, 27100 Pavia, Italy
^vDepartment of Civil Engineering, University of Brescia, via Branze 43, 25123 Brescia, Italy

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In this work we present a hybrid detection method providing simultaneous imaging and timing information suitable for fully monitoring positronium (Ps) formation, its laser excitation, and its spatial propagation for the first trials of pulsed antihydrogen H̅ production through a charge-exchange reaction with trapped antiprotons p̅. This combined method, based on the synchronous acquisition of an EJ-200 scintillation detector and a micro-channel plate (MCP) detector with a dual readout (phosphor screen image and electrical pick-up signal), allows all relevant events in the experiment to be accurately determined in time while allowing high resolution images of e⁺ from Ps laser photodissociations to be acquired. The timing calibration process of the two detectors discussed in details as well as the future perspectives opened by this method.

DOI:10.12693/APhysPolA.137.96
PACS numbers: 39.10.+j, 36.10.Dr, 78.79.Bj