Poomaradee, Tanapoom;
(2021)
Towards ultracold Caesium isomers.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
This PhD thesis reports on works towards laser cooling and trapping caesium isotopes and nuclear isomers. The main outcome of the research was the installation of an experimental facility for obtaining ∼100 µK samples of 135mCs, and in the test of the facility with 133Cs+ ionic beams neutralised and trapped in MagnetoOptical Traps (MOTs). The work can be divided into three related experiments, instrumental for obtaining ultra-cold isomers of caesium atoms. The first part was conducted in the laser cooling laboratory at University College London. The task consisted of designing and setting up a laser and imaging systems for a dual-chamber MOT of 133Cs atoms. The laser systems comprise of two main lasers, cooling and repumping lasers, each equipped with frequency stabilisation and amplification stages. The second part of the work took place in the Accelerator Laboratory of the University of Jyvaskyla (Finland). Here, the systems created at UCL were transferred and installed within the existing Ion Guide Isotope Separation On-Line (IGISOL) facility. The reassembled system was tested again with the 133Cs MOT and optimised for stability and robustness in a new, uncontrolled, and noisy environment. In the third part of the experiment, the system in Finland was upgraded for neutralisation and laser cooling of an incoming +1 ions beam produced by IGISOL. This required the installation of a new experimental chamber, equipped with a thin Y foil for ion implantation and neutralisation, and coated with a low-desorption energy coating to increase the trapping efficiency. In parallel, the ions’ delivery system and connection to the IGISOL electrostatic transport line were also created. In this phase, the implantation of 135mCs+ beams was tested. In order to monitor the production and transport of the desired ions, the gamma decay of 135mCs implanted in a Ge detector was observed. The life-time of 135mCs atoms was measured to confirm the implanted species. Moreover, trapping of 135Cs was attempted. The long term goal of the research started with this thesis is to employ the facility to realise Bose-Einstein condensate of 135mCs. The realisation would have numbers of applications, most notably paving the path for investigations on multibody physics in ultra-cold nuclear matter, and the demonstration of the generation of coherent gamma photons.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Towards ultracold Caesium isomers |
| Event: | UCL (University College London) |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| 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 |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10135182 |
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