Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator

Maitrallain, A and Brunetti, E and Streeter, M J V and Kettle, B and Spesyvtsev, R and Vieux, G and Shahzad, M and Ersfeld, B and Yoffe, S R and Kornaszewski, A and Finlay, O and Ma, Y and Albert, F and Bourgeois, N and Dann, S J D and Lemos, N and Cipiccia, S and Cole, J M and González, I G and Willingale, L and Higginbotham, A and Hussein, A E and Šmid, M and Falk, K and Krushelnick, K and Lopes, N C and Gerstmayr, E and Lumsdon, C and Lundh, O and Mangles, S P D and Najmudin, Z and Rageev, P P and Symes, D R and Thomas, A G R and Jaroszynski, D A (2022) Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator. New Journal of Physics, 24 (1). 013017. ISSN 1367-2630 (https://doi.org/10.1088/1367-2630/ac3efd)

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Abstract

Laser wakefield accelerators commonly produce on-axis, low-divergence, high-energy electron beams. However, a high charge, annular shaped beam can be trapped outside the bubble and accelerated to high energies. Here we present a parametric study on the production of low-energy-spread, ultra-relativistic electron ring beams in a two-stage gas cell. Ring-shaped beams with energies higher than 750 MeV are observed simultaneously with on axis, continuously injected electrons. Often multiple ring shaped beams with different energies are produced and parametric studies to control the generation and properties of these structures were conducted. Particle tracking and particle-in-cell simulations are used to determine properties of these beams and investigate how they are formed and trapped outside the bubble by the wake produced by on-axis injected electrons. These unusual femtosecond duration, high-charge, high-energy, ring electron beams may find use in beam driven plasma wakefield accelerators and radiation sources.

ORCID iDs

Maitrallain, A, Brunetti, E ORCID logoORCID: https://orcid.org/0000-0001-8302-9762, Streeter, M J V, Kettle, B, Spesyvtsev, R, Vieux, G ORCID logoORCID: https://orcid.org/0000-0003-4040-4117, Shahzad, M, Ersfeld, B ORCID logoORCID: https://orcid.org/0000-0001-5597-9429, Yoffe, S R ORCID logoORCID: https://orcid.org/0000-0002-6723-4990, Kornaszewski, A, Finlay, O, Ma, Y, Albert, F, Bourgeois, N, Dann, S J D, Lemos, N, Cipiccia, S, Cole, J M, González, I G, Willingale, L, Higginbotham, A, Hussein, A E, Šmid, M, Falk, K, Krushelnick, K, Lopes, N C, Gerstmayr, E, Lumsdon, C, Lundh, O, Mangles, S P D, Najmudin, Z, Rageev, P P, Symes, D R, Thomas, A G R and Jaroszynski, D A ORCID logoORCID: https://orcid.org/0000-0002-3006-5492;
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