Efficient positronium laser excitation for antihydrogen production in a magnetic field

Castelli, F.; Boscolo, I.; Cialdi, S.; Giammarchi, M.; Comparat, D.

doi:10.1103/physreva.78.052512

Cited by 58 publications

(52 citation statements)

References 35 publications

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“…The scan with the mid-IR laser wavelength (shown in Fig. 5, right panel) showed the multi-peak structure typical of atomic spectra in presence of broadening of the energy levels with an isolated line (n = 15) and a quasi-continuum of energy levels (n > 16), consistent with the expected broadening caused by the 300 V cm −1 electric field present in the experimental chamber (see [17] and [18]). The overall efficiency of the Rydberg excitation could be estimated by the relative reduction in the Ps signal in the same time window used for the photoionization experiment, 7.9%, as in-flight annihilations of high-n states of Ps are negligible.…”

Section: Ps Laser Excitation To Rydberg Levelssupporting

confidence: 74%

Advances in Ps Manipulations and Laser Studies in the AEgIS Experiment

Caravita¹,

Aghion²,

Amsler³

et al. 2017

Acta Phys. Pol. B

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(1583) 1584 R. Caravita et al.Positronium (Ps), the unstable bound state of electron and positron, is a valuable system for neutral antimatter spectroscopic studies and for antihydrogen production. Forming a pulsed beam cold antihydrogen using charge-exchange with the Rydberg Ps is the goal of the AEgIS Collaboration, which aims to measure gravity on neutral antimatter. Recent results achieved in producing, manipulating and studying Ps are summarized. Ps has been first produced with mesoporous silica targets in a reflection geometry. Spectroscopy of Ps n = 3 state has been conducted, yielding as a byproduct an independent estimate of the produced Ps temperature. Efficient laser excitation to the Rydberg levels was then achieved, validating the proof-of-concept of AEgIS. Subsequently, production of Ps from a new class of transmission targets was also achieved, opening the possibility for future experiments.

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Section: Ps Laser Excitation To Rydberg Levelssupporting

confidence: 74%

Advances in Ps Manipulations and Laser Studies in the AEgIS Experiment

Caravita¹,

Aghion²,

Amsler³

et al. 2017

Acta Phys. Pol. B

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“…The Ps atoms exit the material in the direction of a gas of antiprotons in a Penning trap. Using a two-step process, the Ps will be excited optically, first to a quantum number n = 3 state, and then to a high-Rydberg state with n ≥ 20 (Castelli et al, 2008).…”

Section: B Gravity Studies With Antimattermentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

225

222

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In recent years, there has been a wealth of new science involving low-energy antimatter (i.e., positrons and antiprotons) at energies ranging from 10 2 to less than 10 −3 eV. Much of this progress has been driven by the development of new plasma-based techniques to accumulate, manipulate and deliver antiparticles for specific applications. This article focuses on the advances made in this area using positrons. However many of the resulting techniques are relevant to antiprotons as well. An overview is presented of relevant theory of single-component plasmas in electromagnetic traps. Methods are described to produce intense sources of positrons and to efficiently slow the typically energetic particles thus produced. Techniques are described to trap positrons efficiently and to cool and compress the resulting positron gases and plasmas. Finally, the procedures developed to deliver tailored pulses and beams (e.g., in intense, short bursts, or as quasi-monoenergetic continuous beams) for specific applications are reviewed. The status of development in specific application areas is also reviewed. One example is the formation of antihydrogen atoms for fundamental physics [e.g., tests of invariance under charge conjugation, parity inversion and time reversal (the CPT theorem), and studies of the interaction of gravity with antimatter]. Other applications discussed include atomic and materials physics studies and study of the electron-positron many-body system, including both classical electron-positron plasmas and the complementary quantum system in the form of Bose-condensed gases of positronium atoms. Areas of future promise are also discussed. The review concludes with a brief summary and a list of outstanding challenges.

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“…Laser spectroscopy of Ps in small pores can be used to determine pore sizes (even with closed pore structures), measure Ps cooling and diffusion rates, and efficiently produce excited state atoms for use in the formation of antihydrogen beams [11]. We note that recently laser spectroscopy of O 2 gas in porous Al 2 O 3 was performed [12] and line broadening due to wall collisions was observed, which could be used to measure pore sizes in samples with open pore structures.…”

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confidence: 95%

Cavity Induced Shift and Narrowing of the Positronium Lyman-αTransition

et al. 2011

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We report experiments in which the line shape of the Lyman-alpha (1S-2P) transition was measured for positronium (Ps) atoms both inside and outside a porous silica target. The energy interval ÁE for confined atoms was observed to be larger than that of free Ps by 1:26 AE 0:06 meV. A configuration interaction calculation yields results that are consistent with our $5 nm sample, and suggests that ÁE decreases dramatically for larger cavity diameters. The linewidth of the transition, ð0:066 AE 0:004Þ nm (FWHM), is about half of what one would expect for free Ps at room temperature due to the Dicke line narrowing effect of confinement. Such measurements can be used to determine void sizes in porous films and Ps dynamics therein, and elimination of the Doppler spread of atoms in a porous film could be useful for the efficient excitation of a Ps gas.

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Efficient positronium laser excitation for antihydrogen production in a magnetic field

Cited by 58 publications

References 35 publications

Advances in Ps Manipulations and Laser Studies in the AEgIS Experiment

Advances in Ps Manipulations and Laser Studies in the AEgIS Experiment

Plasma and trap-based techniques for science with positrons

Cavity Induced Shift and Narrowing of the Positronium Lyman-αTransition

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