Electron bunch evolution in laser-wakefield acceleration

D. E. Cardenas, S. Chou, E. Wallin, J. Xu, L. Hofmann, A. Buck, K. Schmid, D. E. Rivas, B. Shen, A. Gonoskov, M. Marklund, L. Veisz

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We report on systematic and high-precision measurements of the evolution of electron beams in a laser-wakefield accelerator (LWFA). Utilizing shock-front injection, a technique providing stable, tunable and high-quality electron bunches, acceleration and deceleration of few-MeV quasimonoenergetic beams were measured with cutting-edge technology sub-5-fs and 8-fs laser pulses. We explain the observations with dephasing, an effect that fundamentally limits the performance of LWFAs. Typical density dependent electron energy evolution with 57-300 μm dephasing length and 6-20 MeV peak energy was observed and is well described by a parabolic fit. This is a promising electron source for time-resolved few-fs electron diffraction.

Original languageEnglish
Article number112803
JournalPhysical Review Accelerators and Beams
Issue number11
StatePublished - 30 Nov 2020


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