Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum

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.; Demetrio, A.; Noto, L. Di; Doser, M.; Dudarev, A.; Ereditato, A.; Evans, C.; Fesel, J.; Fontana, A.; Forslund, Ola Kenji; Gerber, S.; Giammarchi, M.; Gligorova, A.; Gninenko, S.; Guatieri, F.; Haider, S.; Holmestad, H.; Huse, T.; Jernelv, Ine L.; Jordan, Elena; Kaltenbacher, T.; Kellerbauer, A.; Kimura, Mitsuhiro; Koetting, T.; Krasnický, D.; Lagomarsino, V.; Lebrun, P.; Lansonneur, P.; Lehner, S.; Liberadzka, J.; Malbrunot, C.; Mariazzi, S.; Marx, L.; Matveev, V.; Mazzotta, Z.; Nebbia, G.; Nédélec, P.; Oberthaler, Markus K.; Pacifico, N.; Pagano, D.; Penasa, L.; Petráček, V.; Pistillo, C.; Prelz, F.; Prevedelli, M.; Ravelli, L.; Rienäcker, B.; Røhne, O.; Rosenberger, S.; Rotondi, A.; Sacerdoti, M.; Sandaker, H.; Santoro, R.; Scampoli, P.; Sorrentino, F.; Špaček, M.; Storey, J. W.; Strojek, I.; Testera, G.; Tietje, I. C.; Vamosi, S.; Widmann, E.; Yzombard, P.; Zavatarelli, S.; Zmeskal, J.

doi:10.1016/j.nimb.2015.08.097

Cited by 40 publications

(32 citation statements)

References 28 publications

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“…The system used to perform the present experiment is described in detail elsewhere [25,28,29]. Briefly, positrons emitted by β + decay of a 22 Na source were slowed by a solid Ne moderator [30] to a kinetic energy of a few eV, trapped and cooled in a Surko-style trap through the use of buffer gas [31].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…There the positron plasma was radially compressed using the rotating-wall technique [33] and then extracted by fast pulses of the electric potential on the trap electrodes in the form of 20 ns bunches in the range of a few times 10 7 positrons at 100 eV axial energy. The cloud was then transported to a magnetic-field-free region where it was further compressed in time [34] using a 24-electrode buncher [29] to about 7 ns and accelerated onto a nanochanneled silicon target with a final kinetic energy of 3.3 keV.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…A detailed electric field map of our experimental chamber [25,29] was calculated using SIMION [43] in the plane orthogonal to the laser propagation axis (see Fig. 10, left panel).…”

Section: Modelingmentioning

confidence: 99%

See 2 more Smart Citations

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Aghion¹,

Amsler²,

Antonello³

et al. 2018

Phys. Rev. A

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Producing positronium (Ps) in the metastable 2 3 S state is of interest for various applications in fundamental physics. We report here on an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the 3 3 P level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V cm −1 . The evidence of the 2 3 S state production is obtained to the 3.6σ level of statistical significance using a novel analysis technique of the single-shot positronium annihilation lifetime spectra. The dynamic of the Ps population on the involved levels has been studied with a rate equation model.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

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Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Aghion¹,

Amsler²,

Antonello³

et al. 2018

Phys. Rev. A

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“…5(a), Ps was produced by directing a 3.3 keV beam of e + from a custom-built bunching and electrostatic transport system [38] onto a high-efficiency converter target. Both the ultraviolet (UV) laser with λ UV ≈ 204 .…”

Section: Positronium Lifetime Spectroscopymentioning

confidence: 99%

Probing antimatter gravity – The AEGIS experiment at CERN

Kellerbauer¹,

Aghion²,

Amsler³

et al. 2016

EPJ Web Conf.

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Abstract. The weak equivalence principle states that the motion of a body in a gravitational field is independent of its structure or composition. This postulate of general relativity has been tested to very high precision with ordinary matter, but no relevant experimental verification with antimatter has ever been carried out. The AEGIS experiment will measure the gravitational acceleration of antihydrogen to ultimately 1% precision. For this purpose, a pulsed horizontal antihydrogen beam with a velocity of several 100 m s −1 will be produced. Its vertical deflection due to gravity will be detected by a setup consisting of material gratings coupled with a position-sensitive detector, operating as a moiré deflectometer or an atom interferometer. The AEGIS experiment is installed at CERN's Antiproton Decelerator, currently the only facility in the world which produces copious amounts of low-energy antiprotons. The construction of the setup has been going on since 2010 and is nearing completion. A proof-of-principle experiment with antiprotons has demonstrated that the deflection of antiparticles by a few μm due to an external force can be detected. Technological and scientific development pertaining to specific challenges of the experiment, such as antihydrogen formation by positronium charge exchange or the position-sensitive detection of antihydrogen annihilations, is ongoing.

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“…Two implementations of TDAP are considered: controlled positron beam and operating the Penning-MalmbergSurko trap at LEPTA, allowing to create bunches of positrons of high intensity [7,8]. In the latter case, for realization the TDAP method can be used a bunching system for positron accumulate in the trap will be used (similar to the AEgIS experiments at CERN [9]). The bunch will be subsequently accelerated to achieve the required time resolution.…”

Section: Introductionmentioning

confidence: 99%

Positron annihilation spectroscopy on a beam of positrons the LEPTA facility

et al. 2016

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Abstract.The results and possibilities of the samples surfaces research by the Doppler method of positron annihilation spectroscopy (PAS) for a monochromatic beam of positrons at the LEPTA facility are presented in this paper. Method with high-resolution sensitivity to defects like vacancies and dislocations allows scanning of the surface and near-surface sample layers to a depth of several micrometers by the method of Doppler broadening of annihilation lines. The opportunities for the development of a PAS method based on the measurement of the positron lifetime in the sample irradiated by ordered flow of positrons from the injector of accelerator complex LEPTA at JINR are discussed.LEPTA facility [1] is a complex consisting of the cryogenic positron source based on the emitter -a radioactive 22Na with an activity of 30 mCi, the electromagnetic PenningMalmberg-Surko trap (PMS) and storage ring. After slowing down in a frozen solid neon layer a monochromatic flux of positrons with intensity up to 10 6 part./sec is formed. The width of the positron spectrum is about 2 eV. This flux can be used for fundamental and applied research [2]. It is possible to carry out layer-by-layer scanning of the defects in subsurface layers of the samples at depths from zero to several micrometers by varying the positron energy in the range of 0.05÷35 Kev. For this purpose, one of three versions of the PAS can be used [3]: observation of correlations in the angular distribution of annihilating photons -gamma quanta (ADAP), measurement of the lifetime of positrons in matter with registration the time distribution of the annihilation photons (TDAP) and the change in energy of the annihilation gamma-quanta -registration of Doppler broadening of annihilation lines (DBAL).The most perspective methods that allow to distinguish the defects of vacancy and dislocation types in samples with a sensitivity of 1 defect per 10 7 atoms in the crystal lattice and at depth resolution of the sample in tenths of nanometer, are the last two versions -TDAP and DBAL. Currently, at the LEPTA complex DBAL PAS method is used with the * Corresponding author: m.eseev@narfu.ru

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Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum

Cited by 40 publications

References 28 publications

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Probing antimatter gravity – The AEGIS experiment at CERN

Positron annihilation spectroscopy on a beam of positrons the LEPTA facility

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