Characterization of electrons and x-rays produced using chirped laser pulses in a laser wakefield accelerator

Zhao, T. Z. and Behm, K. and He, Z-H and Maksimchuk, A. and Nees, J. A. and Yanovsky, V. and Thomas, A. G. R. and Krushelnick, K. (2016) Characterization of electrons and x-rays produced using chirped laser pulses in a laser wakefield accelerator. Plasma Physics and Controlled Fusion, 58 (10): 105003. ISSN 0741-3335

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The electron injection process into a plasma-based laser wakefield accelerator can be influenced by modifying the parameters of the driver pulse. We present an experimental study on the combined effect of the laser pulse duration, pulse shape, and frequency chirp on the electron injection and acceleration process and the associated radiation emission for two different gas types-a 97.5% He and 2.5% N-2 mixture and pure He. In general, the shortest pulse duration with minimal frequency chirp produced the highest energy electrons and the most charge. Pulses on the positive chirp side sustained electron injection and produced higher charge, but lower peak energy electrons, compared with negatively chirped pulses. A similar trend was observed for the radiant energy. The relationship between the radiant energy and the electron charge remained linear over a threefold change in the electron density and was independent of the drive pulse characteristics. X-ray spectra showed that ionization injection of electrons into the wakefield generally produced more photons than self-injection for all pulse durations/frequency chirp and had less of a spread in the number of photons around the peak x-ray energy.

Item Type:
Journal Article
Journal or Publication Title:
Plasma Physics and Controlled Fusion
Additional Information:
This is an author-created, un-copyedited version of an article accepted for publication/published in Plasma Physics and Controlled Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/0741-3335/58/10/105003
Uncontrolled Keywords:
?? laser wakefield acceleratorelectronsx-rayschirped laser pulsesbeamsnuclear energy and engineeringcondensed matter physics ??
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Deposited On:
11 Nov 2016 13:54
Last Modified:
31 Dec 2023 00:45