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Laser Cooling Positronium with Broadband Laser Pulses
/ Caravita, R (TIFPA/INFN, Trento) ; Alfaro Campos, S ; Auzins, M ; Berghold, M ; Bergmann, B ; Burian, P ; Brusa, R S ; Camper, A ; Castelli, F ; Cerchiari, G et al.
The first successful demonstration of broadband laser cooling of positronium (Ps) atoms, obtained within the AEgIS experiment at CERN, is presented here. By employing a custom-designed pulsed alexandrite laser system at 243 nm featuring long-duration pulses of 70 ns and an energy able to saturate the 1$^{3}$S–2$^{3}$P transition over the broad spectrum range of 360 GHz, the temperature of a room-temperature Ps cloud was reduced from 380 K to 170 K in 70 ns. [...]
2025 - 6 p.
- Published in : J. Phys. : Conf. Ser. 3029 (2025) 012002
Fulltext: PDF;
In : International Workshop on Positron and Positronium Chemistry, Kanazawa, Japan, 27 Oct - 1 Nov, pp.012002
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Positron-Positronium Converters in Reflection and Transmission Geometry for Gravitational Experiments with Antihydrogen using Moiré Deflectometry
/ Ferguson, R C (Trento U. ; INFN, Trento) ; Alfaro Campos, S (Siegen U. ; Innsbruck U.) ; Auzins, M (Latvia U.) ; Berghold, M (Munich, Tech. U.) ; Bergmann, B (Prague, Tech. U.) ; Burian, P (Prague, Tech. U.) ; Brusa, R S (Trento U. ; INFN, Trento) ; Camper, A (Oslo U.) ; Caravita, R (Trento U. ; INFN, Trento) ; Castelli, F (INFN, Milan ; Milan U.) et al.
In the context of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) located at CERN, positron-positronium converters with a high positron-positronium conversion efficiency have been designed in both reflection and transmission geometries. The converters utilize nanochanneled silicon target technology with positron conversion efficiencies up to around 50% and around 16%, at room temperature and in the absence of magnetic fields, for reflection and transmission respectively. [...]
2025 - 5 p.
- Published in : J. Phys. : Conf. Ser. 3029 (2025) 012005
Fulltext: PDF;
In : International Workshop on Positron and Positronium Chemistry, Kanazawa, Japan, 27 Oct - 1 Nov, pp.012005
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Real-time antiproton annihilation vertexing with submicrometer resolution
/ AEḡIS Collaboration
The primary goal of the AEgIS experiment is to precisely measure the free fall of antihydrogen within Earth's gravitational field. To this end, a cold ~50K antihydrogen beam has to pass through two grids forming a moiré deflectometer before annihilating onto a position-sensitive detector, which shall determine the vertical position of the annihilation vertex relative to the grids with micrometric accuracy. [...]
arXiv:2406.16044.-
2025-04-04 - 10 p.
- Published in : Sci. Adv. 11 (2025) ads1176
Fulltext: 2406.16044 - PDF; document - PDF;
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Development of a Position-Sensitive Detector for Positronium Inertial Sensing Measurements
/ Mariazzi, S (Trento U. ; TIFPA-INFN, Trento) ; Caravita, R (TIFPA-INFN, Trento) ; Glöggler, L (CERN ; Berlin, Tech. U.) ; Povolo, L (Trento U. ; TIFPA-INFN, Trento) ; Penasa, L (Trento U. ; TIFPA-INFN, Trento) ; Sharma, S (TIFPA-INFN, Trento ; Jagiellonian U. ; Jagiellonian U. (main)) ; Moskal, P (Jagiellonian U. ; Jagiellonian U. (main)) ; Brusa, R S (Trento U. ; TIFPA-INFN, Trento)
In the last twenty years, both free fall and interferometry/deflectometry experiments have been proposed for the measurement of the gravitational acceleration on positronium, which is a purely leptonic matter-antimatter atom formed by an electron and its antiparticle (positron). Among the several challenges posed by these experiments is the development of position-sensitive detectors to measure the deflection of positronium in the Earth's gravitational field. [...]
2022 - 5 p.
- Published in : Acta Phys. Pol. A 142 (2022) 319-323
Fulltext: PDF;
In : 4th Jagiellonian Symposium on Advances in Particle Physics and Medicine, Kraków, Poland, 10 - 15 Jul 2022, pp.319-323
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Search for polarized antiproton production
/ Grzonka, D (Julich, Forschungszentrum) ; Alfs, D (Julich, Forschungszentrum ; Jagiellonian U.) ; Asaturyan, A (NAS Armenia, Yerevan) ; Carmignotto, M (Catholic U.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Eyrich, W (Erlangen - Nuremberg U.) ; Głowacz, B (Jagiellonian U.) ; Hauenstein, F (Old Dominion U.) ; Horn, T (Catholic U.) ; Kilian, K (Julich, Forschungszentrum) et al.
The production of antiprotons is studied in view of possible polarization effects as basis for a polarized antiproton beam. If antiprotons are produced with some polarization, a quite simple procedure for the generation of a polarized antiproton beam could be worked out. [...]
2019 - 8 p.
- Published in : Hyperfine Interact. 240 (2019) 22
In : 13th International Conference on Low Energy Antiproton Physics, Paris, France, 12 - 16 Mar 2018, pp.22
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Drift chamber calibration and particle identification in the P-349 experiment
/ Alfs, D (Julich, Forschungszentrum ; Jagiellonian U.) ; Asaturyan, A (NAS Armenia, Yerevan) ; Carmignotto, M (Catholic U.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Eyrich, W (Erlangen - Nuremberg U.) ; Głowacz, B (Jagiellonian U.) ; Grzonka, D (Julich, Forschungszentrum) ; Hauenstein, F (Old Dominion U.) ; Horn, T (Catholic U.) ; Kilian, K (Julich, Forschungszentrum) et al.
The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC..
2019 - 4 p.
- Published in : EPJ Web Conf. 199 (2019) 05017
Fulltext: PDF;
In : 15th International Workshop on Meson Physics, Kraków, Poland, 7 - 12 Jun 2018, pp.05017
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