Imperial College London


Faculty of Natural SciencesDepartment of Physics

Professor of Physics



z.najmudin Website




736Blackett LaboratorySouth Kensington Campus






BibTex format

author = {Spesyvtsev, R and Brunetti, E and Vieux, G and Shahzad, M and Maitrallain, A and Yoffe, S and Ersfeld, B and Kornaszewski, A and Streeter, MJV and Finlay, O and Ma, Y and Kettle, B and Dann, SJD and Albert, F and Bourgeois, N and Cipiccia, S and Cole, JM and Gerstmayr, E and Gonzáles, IG and Higginbotham, A and Hussein, AE and Falk, K and Krushelnick, K and Lemos, N and Lopes, NC and Lumsdon, C and Lundh, O and Mangles, SPD and Najmudin, Z and Rajeev, PP and Smid, M and Symes, DR and Thomas, AGR and Jaroszynski, DA},
doi = {10.1117/12.2522781},
title = {Generation of electron high energy beams with a ring-like structure by a dual stage laser wakefield accelerator},
url = {},
year = {2019}

RIS format (EndNote, RefMan)

AB - © 2019 SPIE. The laser wake-field accelerator (LWFA) traditionally produces high brightness, quasi-monoenergetic electron beams with Gaussian-like spatial and angular distributions. In the present work we investigate the generation of ultra-relativistic beams with ring-like structures in the blowout regime of the LWFA using a dual stage accelerator. A density down-ramp triggers injection after the first stage and is used to produce ring-like electron spectra in the 300 - 600 MeV energy range. These well defined, annular beams are observed simultaneously with the on-axis, high energy electron beams, with a divergence of a few milliradians. The rings have quasi-monoenergetic energy spectra with an RMS spread estimated to be less than 5%. Particle-in-cell simulations confirm that off-axis injection provides the electrons with the initial transverse momentum necessary to undertake distinct betatron oscillations within the plasma bubble during their acceleration process.
AU - Spesyvtsev,R
AU - Brunetti,E
AU - Vieux,G
AU - Shahzad,M
AU - Maitrallain,A
AU - Yoffe,S
AU - Ersfeld,B
AU - Kornaszewski,A
AU - Streeter,MJV
AU - Finlay,O
AU - Ma,Y
AU - Kettle,B
AU - Dann,SJD
AU - Albert,F
AU - Bourgeois,N
AU - Cipiccia,S
AU - Cole,JM
AU - Gerstmayr,E
AU - Gonzáles,IG
AU - Higginbotham,A
AU - Hussein,AE
AU - Falk,K
AU - Krushelnick,K
AU - Lemos,N
AU - Lopes,NC
AU - Lumsdon,C
AU - Lundh,O
AU - Mangles,SPD
AU - Najmudin,Z
AU - Rajeev,PP
AU - Smid,M
AU - Symes,DR
AU - Thomas,AGR
AU - Jaroszynski,DA
DO - 10.1117/12.2522781
PY - 2019///
SN - 0277-786X
TI - Generation of electron high energy beams with a ring-like structure by a dual stage laser wakefield accelerator
UR -
ER -