Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam
<p>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 develo...
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| Format: | Thesis |
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2018
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| _version_ | 1826317173268676608 |
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| author | Zhang, H |
| author2 | Konoplev, I |
| author_facet | Konoplev, I Zhang, H |
| author_sort | Zhang, H |
| collection | OXFORD |
| description | <p>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.</p> |
| first_indexed | 2024-03-06T19:49:04Z |
| format | Thesis |
| id | oxford-uuid:2354c364-d4a3-4f98-8175-5514c25b4307 |
| institution | University of Oxford |
| last_indexed | 2025-02-19T04:34:19Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | oxford-uuid:2354c364-d4a3-4f98-8175-5514c25b43072025-01-24T14:08:16ZCoherent terahertz Smith-Purcell radiation generated by the microbunched electron beamThesishttp://purl.org/coar/resource_type/c_db06uuid:2354c364-d4a3-4f98-8175-5514c25b4307ORA Deposit2018Zhang, HKonoplev, I<p>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.</p> |
| spellingShingle | Zhang, H Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam |
| title | Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam |
| title_full | Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam |
| title_fullStr | Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam |
| title_full_unstemmed | Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam |
| title_short | Coherent terahertz Smith-Purcell radiation generated by the microbunched electron beam |
| title_sort | coherent terahertz smith purcell radiation generated by the microbunched electron beam |
| work_keys_str_mv | AT zhangh coherentterahertzsmithpurcellradiationgeneratedbythemicrobunchedelectronbeam |