THz driven injection for high-quality high-gradient novel acceleration

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Bunching of particle beams driven by laser-generated terahertz pulses offers a route to femtosecond control of electron beams surpassing current radio-frequency capability. Following on from our recent international-first demonstrations of THz-driven acceleration of relativistic beams, we will undertake a proof-of-concept demonstration of THz-driven compression of high energy electron beams. The achievement of THz-driven compression will provide few-femtosecond duration electron beams with femtosecond-level synchronisation control. Such a capability will enable controlled injection into novel acceleration schemes, such as the plasma wakefield acceleration of AWAKE, and the attainment of the beam quality and high energy necessary for high-energy physics. It will also enable revolutionary improvements in accelerator based light sources, and in ultrafast electron diffraction.