Hounsell, Benjamin
(2023)
Conceptual design of the PERLE injector.
PhD thesis, University of Liverpool.
|
Text
200935694_Mar2022.pdf - Author Accepted Manuscript Download (3MB) | Preview |
Abstract
The injector is one of the key components in an ERL as ERL beam quality is source limited. ERL injectors must be capable of delivering high average current beams while mitigating the emittance growth due to effects such as space charge. In this thesis the conceptual design of the PERLE injector is investigated. The injector consists of a 350 kV direct current (DC) photoelectron gun, a low energy section containing two solenoids and a buncher cavity, an superconducting radio frequency (SRF) booster linac and a merger to transport the beam into the main ERL loop. The electrode geometry of the electron gun was optimised for performance at both 350 kV and 220 kV. Then the beam dynamics from the cathode to the exit of the booster linac were optimised and it was shown that it was possible to achieve the specification at that point. However at booster exit an “M” shaped longitudinal phase space developed. Variant injectors with the addition of higher harmonic cavities were explored to see if it was possible to linearise the longitudinal phase space. It was shown that it is possible while still achieving the required transverse emittances. Finally the design of the merger was investigated. Four merger schemes were optimised and compared and two of them were capable of meeting the specification. Once all of the subsections of the injector had been optimised a baseline design without higher harmonic cavities and using a U-bend merger was selected. This design met the specification achieving final emittances of 4.3 mm mrad in the horizontal plane and 3.8 mm mrad in the vertical plane
| Item Type: | Thesis (PhD) |
|---|---|
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 16 Feb 2023 10:56 |
| Last Modified: | 16 Feb 2023 10:56 |
| DOI: | 10.17638/03168262 |
| Supervisors: |
|
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3168262 |
Dimensions
Dimensions
