Group Velocity Matching in Dielectric-Lined Waveguides and its Role in Electron-THz Interaction

Healy, Alisa and Burt, Graeme Campbell and Jamison, Steven (2017) Group Velocity Matching in Dielectric-Lined Waveguides and its Role in Electron-THz Interaction. In: IPAC2017 Proceedings. JACoW, Geneva, pp. 3296-3298. ISBN 9783954501823

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Abstract

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.

Item Type:
Contribution in Book/Report/Proceedings
Subjects:
ID Code:
88578
Deposited By:
Deposited On:
06 Nov 2017 11:26
Refereed?:
Yes
Published?:
Published
Last Modified:
05 May 2020 00:44