Self-injection threshold in self-guided laser wakefield accelerators

Mangles, Stuart P. D. and Genoud, G. and Bloom, M. S. and Burza, M. and Najmudin, Zulfikar and Persson, A. and Svensson, K. and Thomas, Alexander George Roy and Wahlstrom, C.-G. (2012) Self-injection threshold in self-guided laser wakefield accelerators. Physical Review Special Topics: Accelerators and Beams, 15. ISSN 1098-4402

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A laser pulse traveling through a plasma can excite large amplitude plasma waves that can be used to accelerate relativistic electron beams in a very short distance—a technique called laser wakefield acceleration. Many wakefield acceleration experiments rely on the process of wave breaking, or self-injection, to inject electrons into the wave, while other injection techniques rely on operation without self-injection. We present an experimental study into the parameters, including the pulse energy, focal spot quality, and pulse power, that determine whether or not a wakefield accelerator will self-inject. By taking into account the processes of self-focusing and pulse compression we are able to extend a previously described theoretical model, where the minimum bubble size k p r b required for trapping is not constant but varies slowly with density and find excellent agreement with this model.

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Journal Article
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Physical Review Special Topics: Accelerators and Beams
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03 Apr 2017 13:48
Last Modified:
22 Nov 2022 04:33