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WEPVA019 |
Group Velocity Matching in Dielectric-Lined Waveguides and its Role in Electron-THz Interaction |
3296 |
SUSPSIK031 |
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- A.L. Healy, G. Burt
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
- D.M. Graham
The University of Manchester, The Photon Science Institute, Manchester, United Kingdom
- S.P. Jamison
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
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Terahertz(THz)-driven dielectric-lined waveguides have applications in electron manipulation, particularly acceleration, as the use of dielectric allows for phase velocities below the speed of light. However matching a single frequency to the correct velocity does not maximise electron-THz interaction; waveguide dispersion typically results in an unmatched group velocity and so the pulse envelope of a short THz pulse changes along the length of the structure. This reduces field amplitude and therefore accelerating gradient as the envelope propagates at a different velocity to the electron. Presented here is an analysis of the effect of waveguide dispersion on THz-electron interaction and its influence on structure dimensions and choice of THz pulse generation. This effect on net acceleration is demonstrated via an example of a structure excited by a single-cycle THz pulse, with a comparison of multi-cycle, lower intensity THz pulses on net acceleration.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA019
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