eprintid: 1498511
rev_number: 29
eprint_status: archive
userid: 608
dir: disk0/01/49/85/11
datestamp: 2016-06-12 04:50:14
lastmod: 2021-10-04 01:04:52
status_changed: 2017-03-17 14:13:24
type: article
metadata_visibility: show
creators_name: Cooper, BS
creators_name: Alonso, AM
creators_name: Deller, A
creators_name: Wall, TE
creators_name: Cassidy, DB
title: A trap-based pulsed positron beam optimised for positronium laser spectroscopy
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
keywords: Science & Technology, Technology, Physical Sciences, Instruments & Instrumentation, Physics, Applied, Physics, SLOW POSITRONS, ANNIHILATION LIFETIME, LOW-ENERGY, EXCITATION, SURFACES, ACCUMULATOR, TRANSITION, COLLISIONS, RADIATION, INTERVAL
note: © 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
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.
date: 2015-10
date_type: published
publisher: AMER INST PHYSICS
official_url: http://doi.org/10.1063/1.4931690
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_id: 1092964
doi: 10.1063/1.4931690
lyricists_name: Cassidy, David
lyricists_name: Deller, Adam
lyricists_id: DBCAS57
lyricists_id: AMDEL12
actors_name: Cassidy, David
actors_name: Laslett, David
actors_id: DBCAS57
actors_id: DLASL34
actors_role: owner
actors_role: impersonator
full_text_status: public
publication: Review of Scientific Instruments
volume: 86
number: 10
article_number: 103101
pages: 11
issn: 0034-6748
citation:        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 <https://doi.org/10.1063/1.4931690>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1498511/1/Cassidy_1%252E4931690.pdf