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ELSEVIER
DOI: 10.1016/j.nima.2020.163637
Keywords
Scintillator detector; Antihydrogen; Antiproton; Positron; Gravity; Antimatter; Cryogenic tracker
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Funding
- Istituto Nazionale di Fisica Nucleare
- CERN Fellowship programme
- CERN Doctoral student programme
- Swiss National Science Foundation Ambizione Grant [154833]
- Deutsche Forschungsgemeinschaft research grant
- excellence initiative of Heidelberg University
- Marie Sklodowska-Curie Innovative Training Network Fellowship of the European Commission's Horizon 2020 Programme [721559 AVA]
- European Research Council under the European Unions Seventh Framework Program FP7/2007-2013 [291242, 277762]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement ANGRAM [748826]
- Austrian Ministry for Science, Research, and Economy
- Research Council of Norway
- Bergen Research Foundation
- John Templeton Foundation
- Ministry of Education and Science of the Russian Federation
- Russian Academy of Sciences
- European Social Fund [LM2015058]
- Marie Curie Actions (MSCA) [748826] Funding Source: Marie Curie Actions (MSCA)
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We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1T superconducting magnet of the AEgIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4 K and are read out by silicon photomultipliers (MPPCs) at near room temperature. FACT provides the antiproton/antihydrogen annihilation position information with a few ns timing resolution. We present the hardware and software developments which led to the successful operation of the detector for antihydrogen detection and the results of an antiproton-loss based efficiency assessment. The main background to the antihydrogen signal is that of the positrons impinging onto the positronium conversion target and creating a large amount of gamma rays which produce a sizeable signal in the MPPCs shortly before the antihydrogen signal is expected. We detail the characterization of this background signal and its impact on the antihydrogen detection efficiency.
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