The AEgIS experiment

Testera, G.; Aghion, S.; Amsler, C.; Ariga, A.; Ariga, T.; Белов, А. С.; Bonomi, G.; Bräunig, P.; Bremer, J.; Brusa, R. S.; Cabaret, L.; Caccia, M.; Caravita, R.; Castelli, F.; Cerchiari, G.; Chlouba, K.; Cialdi, S.; Comparat, D.; Consolati, G.; Curreli, Sebi; Demetrio, A.; Derking, J. H.; Noto, L. Di; Doser, M.; Dudarev, A.; Ereditato, A.; Ferragut, R.; Fontana, A.; Gerber, S.; Giammarchi, M.; Gligorova, A.; Gninenko, S.; Haider, S.; Hogan, Stephen; Holmestad, H.; Huse, T.; Jordan, Elena; Kawada, J.; Kellerbauer, A.; Kimura, Mitsuhiro; Krasnický, D.; Lagomarsino, V.; Lehner, S.; Malbrunot, C.; Mariazzi, S.; Matveev, V.; Mazzotta, Z.; Nebbia, G.; Nédélec, P.; Oberthaler, Markus K.; Pacifico, N.; Penasa, L.; Petráček, V.; Pistillo, C.; Prelz, F.; Prevedelli, M.; Ravelli, L.; Riccardi, C.; Røhne, O.; Rosenberger, S.; Rotondi, A.; Sandaker, H.; Santoro, R.; Scampoli, P.; Semeria, L.; Simon, M. C.; Špaček, M.; Storey, J. W.; Strojek, I.; Subieta, M.; Widmann, E.; Yzombard, P.; Zavatarelli, S.; Zmeskal, J.

doi:10.1007/s10751-015-1165-5

Cited by 24 publications

(15 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several newer collaborations have been established specifically to measure gravitational interactions involving antihydrogen [651,760]. These groups intend to generate antihydrogn via interactions of trapped antiprotons with excited state Ps atoms, which increases the antihydrogen formation cross section substantially [418,419,432,647].…”

Section: Antimatter Gravity Experimentsmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

View full text Add to dashboard Cite

Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

show abstract

Section: Antimatter Gravity Experimentsmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

View full text Add to dashboard Cite

show abstract

“…The lifetime of the A state is 50 μs with wavelengths of 2.53 μm (branching ratio of 96%) and 4.57 μm (branching ratio of 4%). In order to close the rotational transition cycle, two lasers are required for each of these vibrational transitions to couple X(N = 0, 2) to A(N = 1, J = 1 2 ). The C − 2 anion has the notable advantage of not presenting any hyperfine structure [25].…”

Section: Improvements: Rate Temperaturementioning

confidence: 99%

“…The primary scientific goal of AEgIS [1] is the direct measurement of the Earth's local gravitational acceleration g on antihydrogen (H). The experiment is designed to carry out a gravity measurement with antimatter by observing the vertical displacement (using a highresolution position-sensitive detector) of the shadow image produced by anH beam, formed by its passage through a Moiré deflectometer [2], the classical counterpart of a matter wave interferometer.…”

Section: Introduction and Overviewmentioning

confidence: 99%

AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Doser

Aghion

Amsler

et al. 2018

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

The efficient production of cold antihydrogen atoms in particle traps at CERN's Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth's gravitational acceleration on purely antimatter bodies. The goal of the AEgIS collaboration is to measure the value of for antimatter using a pulsed source of cold antihydrogen and a Moiré deflectometer/Talbot-Lau interferometer. The same antihydrogen beam is also very well suited to measuring precisely the ground-state hyperfine splitting of the anti-atom. The antihydrogen formation mechanism chosen by AEgIS is resonant charge exchange between cold antiprotons and Rydberg positronium. A series of technical developments regarding positrons and positronium (Ps formation in a dedicated room-temperature target, spectroscopy of the=1-3 and =3-15 transitions in Ps, Ps formation in a target at 10 K inside the 1 T magnetic field of the experiment) as well as antiprotons (high-efficiency trapping of [Formula: see text], radial compression to sub-millimetre radii of mixed [Formula: see text] plasmas in 1 T field, high-efficiency transfer of [Formula: see text] to the antihydrogen production trap using an in-flight launch and recapture procedure) were successfully implemented. Two further critical steps that are germane mainly to charge exchange formation of antihydrogen-cooling of antiprotons and formation of a beam of antihydrogen-are being addressed in parallel. The coming of ELENA will allow, in the very near future, the number of trappable antiprotons to be increased by more than a factor of 50. For the antihydrogen production scheme chosen by AEgIS, this will be reflected in a corresponding increase of produced antihydrogen atoms, leading to a significant reduction of measurement times and providing a path towards high-precision measurements.This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.

show abstract

“…Other AD experiments, namely ASACUSA [9], AEGIS [10] and GBAR [11], aim to create, and make measurements using, beams of H atoms. One advantage of this approach is that the investigations can be performed in a field-free region, thus avoiding the Zeeman and motional Stark shifts that are inevitable in a magnetic trap environment.…”

Section: Introductionmentioning

confidence: 99%

Formation of antihydrogen beams from positron–antiproton interactions

Jonsell

Charlton

2019

New J. Phys.

View full text Add to dashboard Cite

The formation of a beam of antihydrogen atoms when antiprotons pass through cold, dense positron plasmas is simulated for various plasma properties and antiproton injection energies. There are marked dependences of the fraction of injected antiprotons which are emitted as antihydrogen in a beam-like configuration upon the temperature of the positrons, and upon the antiproton kinetic energy. Yields as high as 13% are found at the lowest positron temperatures simulated here (5 K) and at antiproton kinetic energies below about 0.1 eV. By 1 eV the best yields are as low as 10 −3 , falling by about two orders of magnitude with an increase of the positron temperature to 50 K. Example distributions for the antihydrogen angular emission, binding energy and kinetic energy are presented and discussed. Comparison is made with experimental information, where possible.

show abstract

The AEgIS experiment

Cited by 24 publications

References 14 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Formation of antihydrogen beams from positron–antiproton interactions

Contact Info

Product

Resources

About