Beinortaitė, Judita;
(2025)
Effects of beam energy deposition and transfer in a plasma-wakefield accelerator on the microsecond timescale.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Achieving high-repetition-rate operation in plasma-wakefield accelerators (PWFA) is necessary to showcase the applicability of this acceleration scheme in future high-energy physics or photon science facilities, operating at up to the MHz level. Topics ranging from technical design of high-repetition-rate plasma module cooling to repeated or cumulative effects in the plasma itself after electron beam energy deposition must be investigated to progress towards this goal. In this thesis, the effects that repeat after each bunch interaction with plasma are explored. Two processes had been studied at the PWFA facility FLASHForward, long-term ion motion, the initial observation of which indicated nanoseconds-lifetime, and long-term ionisation. This involved observing their lifetime, dependencies, especially comparing two gas species, argon and hydrogen, used in the discharge capillary. To assess the feasibility of MHz-level repetition rates in PWFA, the timescale of interest was of the order of microseconds, where the fastest-rate changes in plasma occur on the nanoseconds timescale. The experimentation involved two separate diagnostics, probe electron bunch pair which interacts with a perturbed plasma as a successive bunch and samples the plasma at a nanosecond resolution, and optical emission spectroscopy set up for discharge capillaries at FLASHForward. The knowledge of the measured lifetimes of long-term ion motion and ionisation and their dependencies will help inform the fundamental high-repetition rate limitations in PWFA as well as plasma parameter ranges for future operation.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Effects of beam energy deposition and transfer in a plasma-wakefield accelerator on the microsecond timescale |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2025. 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 UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10203153 |
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