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Pulsed Production of Antihydrogen in AEgIS
/ AEgIS Collaboration
Cold antihydrogen atoms are a powerful tool to probe the validity of fundamental physics laws, and it's clear that colder atoms, generally speaking, allow an increased level of precision.
After the first production of cold antihydrogen ($\bar{H}$) in 2002, experimental efforts have progressed continuously (trapping, beam formation, spectroscopy), with competitive results already achieved by adapting to cold antiatoms techniques previously well developed for ordinary atoms. Unfortunately, the number of $\bar{H}$ atoms that can be produced in dedicated experiments is many orders of magnitude smaller than available hydrogen atoms, which are at hand in large amount, so the development of novel techniques that allow the production of $\bar{H}$ with well defined conditions (and possibly control its formation time and energy levels) is essential to improve the sensitivity of the methods applied by the different experiments.
We present here the first experimental results concerning the production of $\bar{H}$ in a pulsed mode where the time when 90\% of
the atoms are produced is known with an uncertainty of around 250~ns. [...]
2022 - 7 p.
- Published in : PoS DISCRETE2020-2021 (2022) 079
Fulltext: PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021), Bergen, Norway, 29 Nov - 3 Dec 2021, pp.079
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Control system for ion Penning traps at the AEgIS experiment at CERN
/ Nowicka, D (Warsaw U. of Tech.) ; Bergmann, B (Prague, Tech. U.) ; Bonomi, G (Brescia U. ; INFN, Brescia ; INFN, Pavia) ; Brusa, R S (TIFPA-INFN, Trento ; Trento U.) ; Burian, P (Prague, Tech. U.) ; Camper, A (Oslo U.) ; Caravita, R (TIFPA-INFN, Trento ; Trento U.) ; Castelli, F (Milan U. ; INFN, Milan) ; Cheinet, P (LAC, Orsay) ; Comparat, D (LAC, Orsay) et al.
The AEgIS experiment located at the Antiproton Decelerator at CERN aims to measure the gravitational fall of a cold antihydrogen pulsed beam. The precise observation of the antiatoms in the Earth gravitational field requires a controlled production and manipulation of antihydrogen. [...]
2022 - 5 p.
- Published in : J. Phys. : Conf. Ser. 2374 (2022) 012038
Fulltext: PDF;
In : International Conference on Technology and Instrumentation in Particle Physics (TIPP 2021), Online, Canada, 24 - 29 May 2021, pp.012038
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AE$\overline{g}$IS latest results
/ Guatieri, F (TIFPA-INFN, Trento ; Trento U.) ; Aghion, S (Milan, Polytech. ; Bern U., LHEP) ; Amsler, C (Stefan Meyer Inst. Subatomare Phys.) ; Angela, G (Bern U., LHEP) ; Bonomi, G (Norwegian U. Sci. Tech. ; INFN, Pavia ; Pavia U.) ; Brusa, R S (TIFPA-INFN, Trento ; Trento U.) ; Caccia, M (U. Brussels (main) ; Milan U. ; INFN, Brescia) ; Caravita, R (Genoa U. ; INFN, Genoa) ; Castelli, F (U. Brussels (main) ; Milan U.) ; Cerchiari, G (Heidelberg, Max Planck Inst.) et al.
The validity of the Weak Equivalence Principle (WEP) as predicted by General Relativity has been tested up to astounding precision using ordinary matter. The lack hitherto of a stable source of a probe being at the same time electrically neutral, cold and stable enough to be measured has prevented highaccuracy testing of the WEP on anti-matter. [...]
2018 - 7 p.
- Published in : EPJ Web Conf. 181 (2018) 01037
Fulltext: PDF;
In : International Conference on Exotic Atoms and Related Topics (EXA 2017), Vienna, Austria, 11 - 15 Sep 2017, pp.01037
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Positronium Rydberg excitation diagnostic in a 1T cryogenic environment
/ Caravita, R (CERN) ; Mariazzi, S (Trento U. ; INFN, Trento) ; Aghion, S (Milan Polytechnic ; INFN, Milan) ; Amsler, C (Stefan Meyer Inst. Subatomare Phys.) ; Antonello, M (INFN, Milan ; Insubria U., Como) ; Belov, A (Mainz U., Inst. Phys. ; Moscow, INR) ; Bonomi, G (Brescia U. ; INFN, Brescia ; INFN, Pavia) ; Brusa, R S (Trento U. ; INFN, Trento) ; Caccia, M (INFN, Milan ; Insubria U., Como) ; Camper, A (CERN) et al.
Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal of the AEḡIS collaboration, which aims to a first gravity measurement on neutral antimatter. Recently achieved results in Ps formation and laser spectroscopy in the main AEḡIS apparatus are summarized. [...]
2019 - 6 p.
- Published in : AIP Conf. Proc. 2182 (2019) 030002
In : 18th International Conference on Positron Annihilation (ICPA-18): Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications, Orlando, United States, 19 - 24 Feb 2018, pp.030002
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Method for measuring positron number in high intensity nanosecond positron bunches based on Poisson statistic
/ Rienäcker, B (CERN) ; Mariazzi, S (Trento U. ; TIFPA-INFN, Trento) ; Povolo, L (Trento U. ; TIFPA-INFN, Trento) ; Guatieri, F (Tech. U., Munich (main) ; Trento U.) ; Caravita, R (TIFPA-INFN, Trento) ; Penasa, L (Trento U. ; TIFPA-INFN, Trento) ; Pino, F (U. Padua, Dept. Phys. Astron.) ; Nebbia, G (INFN, Padua) ; Brusa, R S (Trento U. ; TIFPA-INFN, Trento)
A novel method for the measurement of the number of positrons contained in intense positron bunches is presented. The technique is based on the Poisson distribution of the number of gamma rays emitted by many simultaneous positron–electron annihilations in a small solid angle. [...]
2022 - 5 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1033 (2022) 166661
Publication: PDF;
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Imaging a positronium cloud in a 1 Tesla
/ Camper, Antoine (CERN) ; Aghion, Stefano (Milan Polytechnic ; INFN, Milan) ; Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Antonello, Massimiliano (INFN, Milan ; Insubria U., Como) ; Belov, Alexander (Moscow, INR) ; Bonomi, Germano (INFM, Brescia ; INFN, Pavia) ; Brusa, Roberto (Trento U. ; TIFPA-INFN, Trento) ; Caccia, Massimo (INFN, Milan ; Insubria U., Como) ; Caravita, Ruggero (CERN) ; Castelli, Fabrizio (INFN, Milan ; Milan U.) et al.
We report on recent developments in positronium work in the frame of antihydrogen production through charge exchange in the AEgIS collaboration [1]. In particular, we present a new technique based on spatially imaging a cloud of positronium by collecting the positrons emitted by photoionization. [...]
2019 - 7 p.
- Published in : EPJ Web Conf. 198 (2019) 00004
Fulltext: PDF;
In : Quantum Technology International Conference 2018, Paris, France, 5 - 7 Sep 2018, pp.00004
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Absolute fraction of emitted Ps determined by GEANT4 supported analysis of gamma spectra
/ Rienäcker, Benjamin (CERN ; Tech. U., Munich (main)) ; Gigl, Thomas (Tech. U., Munich (main)) ; Nebbia, Giancarlo (INFN, Padua) ; Pino, Felix (INFN, Padua) ; Hugenschmidt, Christoph (Tech. U., Munich (main))
The fraction of positronium (Ps) emitted from a surface of a germanium single crystal at high temperature is usually assumed to approach unity at zero positron implantation energy. In the experiment, however, the determination of the absolute Ps fraction is not straight forward since recording a reference spectrum with $100\,\%$ Ps formation remains demanding. [...]
arXiv:2010.01854.-
2020-12-18 - 8 p.
- Published in : Phys. Rev. A 102 (2020) 062212
Fulltext: 2010.01854 - PDF; PhysRevA.102.062212 - PDF;
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