Morgan T. Hibberd, Alisa L. Healy, Daniel S. Lake, Vasileios Georgiadis, Elliott J. H. Smith, Oliver J. Finlay, Thomas H. Pacey, James K. Jones, Yuri Saveliev, David A. Walsh, Edward W. Snedden, Robert B. Appleby, Graeme Burt, Darren Mc.Graham, Steven P. Jamison,
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| Experimental set-up. |
Particle accelerators driven by laser-generated terahertz (THz) pulses promise unprecedented control over the energy–time phase space of particle bunches compared with conventional radiofrequency technology. Here we demonstrate acceleration of a relativistic electron beam in a THz-driven linear accelerator. Narrowband THz pulses were tuned to the phase-velocity-matched operating frequency of a rectangular dielectric-lined waveguide for extended collinear interaction with 35 MeV, 60 pC electron bunches, imparting multicycle energy modulation to chirped (6 ps) bunches and injection phase-dependent energy gain (up to 10 keV) to subcycle (2 ps) bunches. These proof-of-principle results establish a route to whole-bunch linear acceleration of subpicosecond particle beams, directly applicable to scaled-up and multistaged concepts capable of preserving beam quality, thus marking a key milestone for future THz-driven acceleration of relativistic beams.
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