High-Flux Femtosecond X-Ray Emission from Controlled Generation of Annular Electron Beams in a Laser Wakefield Accelerator

Zhao, T. Z. and Behm, K. and Dong, C. F. and Davoine, X. and Kalmykov, S. Y. and Petrov, V. and Chvykov, V. and Cummings, P. and Hou, B. and Maksimchuk, A. and Nees, J. A. and Yanovsky, V. and Thomas, A. G. R. and Krushelnick, K. (2016) High-Flux Femtosecond X-Ray Emission from Controlled Generation of Annular Electron Beams in a Laser Wakefield Accelerator. Physical review letters, 117 (9). ISSN 0031-9007

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Abstract

Annular quasimonoenergetic electron beams with a mean energy in the range 200-400 MeV and charge on the order of several picocoulombs were generated in a laser wakefield accelerator and subsequently accelerated using a plasma afterburner in a two-stage gas cell. Generation of these beams is associated with injection occurring on the density down ramp between the stages. This well-localized injection produces a bunch of electrons performing coherent betatron oscillations in the wakefield, resulting in a significant increase in the x-ray yield. Annular electron distributions are detected in 40% of shots under optimal conditions. Simultaneous control of the pulse duration and frequency chirp enables optimization of both the energy and the energy spread of the annular beam and boosts the radiant energy per unit charge by almost an order of magnitude. These well-defined annular distributions of electrons are a promising source of high-brightness laser plasma-based x rays.

Item Type: Journal Article
Journal or Publication Title: Physical review letters
Additional Information: © 2016 American Physical Society
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 82692
Deposited By: ep_importer_pure
Deposited On: 11 Nov 2016 11:38
Refereed?: Yes
Published?: Published
Last Modified: 18 Oct 2019 00:52
URI: https://eprints.lancs.ac.uk/id/eprint/82692

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