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Title: Velocity-modulated beam driven electromagnetic waves generation in photonic crystals and application in particle acceleration
Author: Xu , Yiming
Awarding Body: Lancaster University
Current Institution: Lancaster University
Date of Award: 2011
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The research presented in this thesis focuses on electromagnetic (EM) waves generation in photonic crystals (PC). A 2D PC with defect(s) can act as a standing-wave resonator that allows only selected resonances to be confined in the defect(s). In this thesis, two single-defect metallic PCs working at 9.532 GHz were designed, fabricated and characterised, and assembled together to a two-PC module similar to a two-cavity klystron. The two-PC module velocity-modulated a low current electron beam and exchanged energy with the beam in ultra high vacuum (UHV). The observed output spectrum indicated that a unique state was confined. Measured output power observed when varying the input power, DC beam current and voltage agre~d well with theoretical and numerical estimations. For multi-beam applications, multi-defect PCs with multiple splitted resonant states were theoretically and numerically investigated. A dual-state 6-beam 2-PC klystron based on a 6-defect PC numerically demonstrated good gain at S-band (2 to 4 GHz) with low current beams. A new concept of compact PC based accelerator integrating a 6-beam klystron and an acceleration cell was introduced through discussions of 7-defect PCs. Limitations and possible improvement of such a structure were analysed and discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available