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

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Published
Publication date16/10/2017
Host publication2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)9781538627204
<mark>Original language</mark>English
Event10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017 - Liverpool, United Kingdom
Duration: 11/09/201713/09/2017

Conference

Conference10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017
Country/TerritoryUnited Kingdom
CityLiverpool
Period11/09/1713/09/17

Publication series

Name2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017

Conference

Conference10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2017
Country/TerritoryUnited Kingdom
CityLiverpool
Period11/09/1713/09/17

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.