Speaker
Description
Laser Wakefield Acceleration (LWFA) enables GV/m acceleration gradients, promising compact accelerator designs with advantages in cost, environmental impact and portability. Standard LWFA schemes suffer from poor shot-to-shot stability and beam quality, resulting in broad energy spectrums, beam current variations, high emittance and limited intensity. External injection schemes attempt to overcome such challenges by treating the LWFA stage as purely an accelerating structure and not as a source. Motivated by the pursuit of compactness, external injection of low-energy (< 20 MeV) electron beams into ~ 10 cm of plasma will be explored using the Fourier-Bessel Particle-In-Cell (FBPIC) code. Bayesian optimisation is employed to assess the optimal injection phase and TWISS parameters to maximise the charge capture efficiency. For a given injection energy and laser intensity, a trade-off between capture efficiency and correlated energy spread is presented. This investigation presents working points from which future compact external injection designs can be optimised.
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