Group velocity matching in terahertz-driven dielectric-lined waveguides for electron acceleration

Healy, A. L. and Burt, G. and Jamison, S. P. (2017) Group velocity matching in terahertz-driven dielectric-lined waveguides for electron acceleration. In: 2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017. 2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017 . Institute of Electrical and Electronics Engineers Inc., GBR. ISBN 9781538627204

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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. The effect on net acceleration is demonstrated via an example of a structure excited by a THz pulse of different temporal lengths.

Item Type:
Contribution in Book/Report/Proceedings
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3108
Subjects:
ID Code:
137871
Deposited By:
Deposited On:
28 Apr 2020 08:00
Refereed?:
Yes
Published?:
Published
Last Modified:
06 Jul 2020 01:40