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Self-injection threshold in self-guided laser wakefield accelerators

Publiceringsår: 2012
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review Special Topics. Accelerators and Beams
Volym: 15
Nummer: 1
Dokumenttyp: Artikel i tidskrift
Förlag: American Physical Society


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.


  • Atom and Molecular Physics and Optics


  • ISSN: 1098-4402

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