Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.770774
Title: Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam
Author: Zhang, Huibo
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2018
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Abstract:
The main objective of the thesis is to investigate the generation of coherent terahertz (THz) Smith-Purcell radiation using microbunched electron beams. Several ways of generating electron microbunches were considered and a method to monitor the separation between microbunches was developed. Microbunch trains, with picosecond (or sub-picosecond) periodicities, were generated through a variety of methods, including the modulation of a long electron bunch in a plasma channel, direct generation of microbunches from a photocathode (at KEK-LUCX, Japan), and the modulation of a long bunch (with an initial density modulation) using the longitudinal space charge forces during its propagation in the beamline (at TTX, China). The method to monitor the periodicity of microbunch trains was based on the analysis of coherent Smith-Purcell radiation and experiments were carried out with two microbunches to confirm its validity. Furthermore, the generation of coherent THz Smith-Purcell radiation using microbunch trains with tunable periodicities was investigated. The properties of the radiation generated were studied. Numerical simulations and experimental measurements have confirmed that the microbunching of electron bunches results in the intensity of the generated coherent Smith-Purcell radiation concentrating at around the microbunch frequency. These proof of concept studies demonstrate the possibility of the generation of high power, broadly tunable THz radiation using microbunched electron beams.
Supervisor: Konoplev, Ivan Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.770774  DOI: Not available
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