E-Thesis 409 views 81 downloads
A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud / PHILLIP JOHN
Swansea University Author: PHILLIP JOHN
DOI (Published version): 10.23889/SUthesis.63766
Abstract
The density of the positron cloud is a crucial parameter in many applications ofaccumulated positrons. Previous work has shown that adjusting the frequency ofthe rotating wall potential following positron accumulation can be used to controlthe density of positron clouds. In this work, positron cloud...
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Swansea, Wales, UK
2023
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| Institution: | Swansea University |
| Degree level: | Master of Philosophy |
| Degree name: | M.Phil |
| Supervisor: | Eriksson, Stefan J. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa63766 |
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| Abstract: |
The density of the positron cloud is a crucial parameter in many applications ofaccumulated positrons. Previous work has shown that adjusting the frequency ofthe rotating wall potential following positron accumulation can be used to controlthe density of positron clouds. In this work, positron clouds were studied afterbeing compressed using a linear rotating wall frequency sweep under a selection ofrotating wall drive amplitudes and cooling gas pressures following an initial staticfrequency compression. This was performed for SF6, CF4, and briefly for CO. Theeffect of changing the cooling gas appears congruent to that shown by the staticfrequency case. The results are in qualitative agreement with previous work byDeller et al., and compare briefly but favourably to a simplistic numerical model. |
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| Keywords: |
Positrons, rotating wall, frequency sweep |
| College: |
Faculty of Science and Engineering |