Directed fluxes of positronium using pulsed travelling optical lattices

Barker, P. F.; Charlton, M.

doi:10.1088/1367-2630/14/4/045005

Cited by 9 publications

(3 citation statements)

References 43 publications

(44 reference statements)

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“…Some of the properties of n = 30 Rydberg states of Ps, H and He are compared in Table 4. Note that while many Ps Rydberg properties do indeed scale from those of H by a factor of ≈2, the dipole moment to mass ratio depends also on the electron/proton mass ratio, meaning that Ps should be very easy to control using Stark deceleration methods (see also [412]). …”

Section: Excitation Of Rydberg Statesmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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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.

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Section: Excitation Of Rydberg Statesmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…If the lifetime of Ps is extended by Rydberg excitation subsequent to the formation in transmission, the Ps can be utilized to measure the gravitational free-fall of Ps [19], to produce antihydrogen inside a Penning trap by antiproton charge exchange [31], or to fill a stellarator for electron-positron plasma studies [32]. Variable energy Ps beamlines using the scheme of acceleration via an optical lattice [33] would benefit greatly from Ps formation in transmission, as would the incorporation of Ps inside macro cavities for Ps Bose-Einstein condensation [22]. Since transmission targets also allow optical access along the beam axis they can be used for experiments in which the laser orientation is important, such as state selective excitation with circularly polarized light.…”

Section: Introductionmentioning

confidence: 99%

Positronium emission and cooling in reflection and transmission from thin meso-structured silica films

Andersen

Cassidy

Chevallier

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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Measurements of the positronium (Ps) energy and formation fraction in reflection and transmission from a thin meso-structured silica target have been conducted using single-shot positron annihilation lifetime spectroscopy and Doppler spectroscopy. The silica sample is made using glancing angle deposition of vaporized SiO2 on a suspended thin carbon foil. Optical access through the silica sample facilitates measurement of the longitudinal Ps energy, and the Ps energy in the reflection geometry is found to decrease with positron energy as expected, with a minimum achievable Ps energy of 0.203(12) and 0.26(3) eV for the transverse and longitudinal directions, respectively. In the transmission geometry cooling of Ps becomes evident at the minimum positron impact energy required for the positrons to penetrate the carbon foil and enter the meso-structured silica. The minimum energies for this geometry are 0.210(12) and 0.287(14) eV in the transverse and longitudinal directions, respectively, and the minimum achievable Ps energy is found to be limited by the thickness of the structured silica target, since the same energy was found in both geometries.

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“…Ā H beam may also find application in further searches for a possible electric charge of the anti-atom. Finally, it may be feasible to use pulsed travelling optical lattices (as suggested for the formation of Ps beams [54]) to eject trapped H in a beam whose properties are defined by those of the lasers used to generate the lattice.…”

Section: Discussion and Prospectsmentioning

confidence: 99%

Closing in on the properties of antihydrogen

Charlton

2017

Eur. Phys. J. D

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Abstract. Recent achievements leading, amongst other things, to the observation of the two-photon 1S-2S transition in antihydrogen are reviewed. We summarise some of the technical advances that were necessary to facilitate this, and how these addressed the requirements posed by the underlying physical processes. Aspects of the latter have been elucidated by simulations aimed at describing as closely as possible the experimental situations, and we describe some recent insights from that work. We will close with a look to the future.

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Directed fluxes of positronium using pulsed travelling optical lattices

Cited by 9 publications

References 43 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Positronium emission and cooling in reflection and transmission from thin meso-structured silica films

Closing in on the properties of antihydrogen

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