Cooper, BS;
Alonso, AM;
Deller, A;
Wall, TE;
Cassidy, DB;
(2015)
A trap-based pulsed positron beam optimised for positronium laser spectroscopy.
Review of Scientific Instruments
, 86
(10)
, Article 103101. 10.1063/1.4931690.
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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.
| Type: | Article |
|---|---|
| Title: | A trap-based pulsed positron beam optimised for positronium laser spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.4931690 |
| Publisher version: | http://doi.org/10.1063/1.4931690 |
| Language: | English |
| Additional information: | © 2015 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 Cooper, BS; Alonso, AM; Deller, A; Wall, TE; Cassidy, DB; (2015) A trap-based pulsed positron beam optimised for positronium laser spectroscopy. Review of Scientific Instruments , 86 (10) , Article 103101 and may be found at http://doi.org/10.1063/1.4931690 |
| Keywords: | Science & Technology, Technology, Physical Sciences, Instruments & Instrumentation, Physics, Applied, Physics, SLOW POSITRONS, ANNIHILATION LIFETIME, LOW-ENERGY, EXCITATION, SURFACES, ACCUMULATOR, TRANSITION, COLLISIONS, RADIATION, INTERVAL |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1498511 |
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