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Article Dans Une Revue Nature Année : 2006

Controlled injection and acceleration of electrons in plasma wakefields by colliding laser pulses

Jérôme Faure
Agustin Lifschitz
Y. Glinec
  • Fonction : Auteur
  • PersonId : 838232
Victor Malka

Résumé

In laser-plasma-based accelerators, an intense laser pulse drives a large electric field (the wakefield) which accelerates particles to high energies in distances much shorter than in conventional accelerators. These high acceleration gradients, of a few hundreds of gigavolts per metre, hold the promise of compact high-energy particle accelerators. Recently, several experiments have shown that laser-plasma accelerators can produce high-quality electron beams, with quasi-monoenergetic energy distributions at the 100 MeV level. However, these beams do not have the stability and reproducibility that are required for applications. This is because the mechanism responsible for injecting electrons into the wakefield is based on highly nonlinear phenomena, and is therefore hard to control. Here we demonstrate that the injection and subsequent acceleration of electrons can be controlled by using a second laser pulse. The collision of the two laser pulses provides a pre-acceleration stage which provokes the injection of electrons into the wakefield. The experimental results show that the electron beams obtained in this manner are collimated (5 mrad divergence), monoenergetic (with energy spread <10 per cent), tuneable (between 15 and 250 MeV) and, most importantly, stable. In addition, the experimental observations are compatible with electron bunch durations shorter than 10 fs. We anticipate that this stable and compact electron source will have a strong impact on applications requiring short bunches, such as the femtolysis of water, or high stability, such as radiotherapy with high-energy electrons or radiography for materials science.

Dates et versions

hal-00502237 , version 1 (13-07-2010)

Identifiants

Citer

Jérôme Faure, Clément Rechatin, A. Norlin, Agustin Lifschitz, Y. Glinec, et al.. Controlled injection and acceleration of electrons in plasma wakefields by colliding laser pulses. Nature, 2006, 444, pp.737-739. ⟨10.1038/nature05393⟩. ⟨hal-00502237⟩
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