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A trap-based pulsed positron beam optimised for positronium laser spectroscopy
File | Description | Size | Format | |
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1.4931690.pdf | Published version | 6.28 MB | Adobe PDF | View/Open |
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 |