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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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review Special Topics: Accelerators and Beams
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
85788
Deposited By:
Deposited On:
03 Apr 2017 13:48
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Aug 2020 02:52