A trap-based pulsed positron beam optimised for positronium laser spectroscopy

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Title: A trap-based pulsed positron beam optimised for positronium laser spectroscopy
Authors: Cooper, BS
Alonso, AM
Deller, A
Wall, TE
Cassidy, DB
Item Type: Journal Article
Abstract: We describe a pulsed positron beam that is optimised for positronium (Ps) laser-spectroscopy experiments. The system is based on a two-stage Surko-type buffer gas trap that produces 4 ns wide pulses containing up to 5 × 105 positrons at a rate of 0.5-10 Hz. By implanting positrons from the trap into a suitable target material, a dilute positronium gas with an initial density of the order of 107 cm−3 is created in vacuum. This is then probed with pulsed (ns) laser systems, where various Ps-laser interactions have been observed via changes in Ps annihilation rates using a fast gamma ray detector. We demonstrate the capabilities of the apparatus and detection methodology via the observation of Rydberg positronium atoms with principal quantum numbers ranging from 11 to 22 and the Stark broadening of the n = 2 → 11 transition in electric fields.
Issue Date: 1-Oct-2015
Date of Acceptance: 13-Sep-2015
URI: http://hdl.handle.net/10044/1/40564
DOI: http://dx.doi.org/10.1063/1.4931690
ISSN: 0034-6748
Publisher: AIP Publishing
Journal / Book Title: Review of Scientific Instruments
Volume: 86
Issue: 10
Copyright Statement: © 2016 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Review of Scientific Instruments and may be found at http://dx.doi.org/10.1063/1.4931690.
Keywords: Applied Physics
09 Engineering
02 Physical Sciences
03 Chemical Sciences
Publication Status: Published
Article Number: 103101
Appears in Collections:Quantum Optics and Laser Science
Physics
Faculty of Natural Sciences



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