Journal Article

Acceleration of relativistic beams using laser-generated terahertz pulses

Jones, James K, Hibberd, Morgan T, Pacey, Thomas H, Walsh, David A, Appleby, Robert B, Lake, Daniel S, Healy, Alisa L, Jamison, Steven P, Smith Elliott J H, Finlay, Oliver J, Saveliev Yuri, Burt, Graeme, Graham, Darren M, Snedden, Edward W, Georgiadis Vasileios

2020

Overview

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.Relativistic 35 MeV electron bunches with charges of 60 pC are accelerated in a terahertz-wave-driven dielectric waveguide. When the terahertz pulse energy is 0.8 μJ, an accelerating gradient of 2 MeV m−1 and energy gain of 10 keV are achieved.

• Publisher: Nature Publishing Group
• Subject: Acceleration / Dielectric waveguides / Electrons / Energy / Laser beams / Narrowband / Particle accelerators / Particle beams / Phase matching / Radio frequency / Relativistic effects / Relativistic electron beams / Terahertz frequencies