Speaker
Description
Electron bunches internally injected into plasma accelerators reach relativistic energies in giga-volt-per-metre-level fields, reducing emittance growth due to space charge and ultimately yielding high-brightness beams.Density downramps with steep gradients have provided an effective method of controllable injection into beam-driven plasma-wakefield accelerators, but previously have relied on the fields of an intense particle beam or laser to preionise the acceleration stage. Here, injection using downramps formed via optical ionisation is experimentally shown to be compatible with discharge-based-acceleration stages, producing bunches with up to six times higher energy than with laser-only preionisation. Results demonstrating injection of charge using a purely discharge-preionised acceleration stage and a low-energy injection laser suggest the feasibility of a scalable, high-repetition-rate injection stage—potentially attractive for high-average-power applications.
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