3 years ago

A study on the performance of an electrostatic focusing mirror for Rydberg positronium

Adric C. L. Jones, Daniel J. Adams, Melina Fuentes-Garcia, Allen P. Mills Jr., Harry W. K. Tom, Gabriel G. Cecchini, Jeremy Moxom, Harris J. Rutbeck-Goldman, Kevin Osorno, Rod G. Greaves

Abstract

Recently, we demonstrated an electrostatic mirror that focuses a beam of Rydberg positronium atoms over a 6 m path to a 32 ± 1 mm FWHM diameter spot on a position sensitive detector. The mirror is comprised of 360 wires arranged in the shape of a nearly-cylindrical revolved truncated ellipse ~96 mm in radius, with potentials of equal and opposite magnitude applied to alternating wires to create a short-ranged electric field that decreases in magnitude exponentially with e-folding length = 0.53 mm. Here, we explore in detail the observed resolution and discuss the factors contributing to its broadening from the ideal point focus of a perfect embodiment of the mirror. Improvements to the design are considered, with the aim to achieve a mirror with a resolution of <0.5 mm, which is necessary for a proposed measurement of the gravitational deflection of positronium.

Graphical abstract

Publisher URL: https://link.springer.com/article/0.1140/epjd/e2017-80625-4

DOI: 10.1140/epjd/e2017-80625-4

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