Jaworska, Helena (2024) Spectroscopy of Rubidium Plasma for Wakefield Diagnostics at the AWAKE Experiment. Bachelor's Thesis, Physics.
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Abstract
Previous work performed at the Stanford Linear Accelerator (SLAC) showed that the light intensity of a lithium plasma line is proportional to the energy deposited in plasma by the driver when exciting wakefields. This thesis is focused on spectroscopy of rubidium plasma light to investigate wakefields created at the AWAKE experiment at CERN. This was done by measuring the intensity of multiple rubidium lines during wakefield excitation and comparing it to simulation results and expected line intensities from the NIST Atomic Spectrum Database. The main goals were to verify if the measurements agree with expectations, and to establish a correlation between the light intensity and plasma electron temperature. First, it was found that the simulations are only accurate for small propagation distances into the plasma, where linear theory applies. Second, it was determined the temperature of plasma cannot be accurately predicted by this type of measurement due to lack of understanding of behaviour of the plasma electrons due to the presence of wakefields. Lastly, plasma light measurements as a diagnostic for wakefield amplitude are only appropriate when observing a single transition. Further experiments are needed to look at the time-resolved spectrum of the plasma to provide insight into the evolution of plasma light. This could give information about the velocity distribution of plasma electrons and therefore their temperature.
| Item Type: | Thesis (Bachelor's Thesis) |
|---|---|
| Supervisor name: | Hoekstra, R.A. and Kavatsyuk, M. |
| Degree programme: | Physics |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 14 Aug 2024 13:59 |
| Last Modified: | 14 Aug 2024 13:59 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/33953 |
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