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Article Dans Une Revue Physics of Plasmas Année : 2016

Energy boost in laser wakefield accelerators using sharp density transitions

C. Thaury
Agustin Lifschitz
Kim Ta Phuoc
Victor Malka

Résumé

The energy gain in laser wakefield accelerators is limited by dephasing between the driving laser pulse and the highly relativistic electrons in its wake. Since this phase depends on both the driver and the cavity length, the effects of dephasing can be mitigated with appropriate tailoring of the plasma density along propagation. Preceding studies have discussed the prospects of continuous phase-locking in the linear wakefield regime. However, most experiments are performed in the highly non-linear regime and rely on self-guiding of the laser pulse. Due to the complexity of the driver evolution in this regime, it is much more difficult to achieve phase locking. As an alternative, we study the scenario of rapid rephasing in sharp density transitions, as was recently demonstrated experimentally. Starting from a phenomenological model, we deduce expressions for the electron energy gain in such density profiles. The results are in accordance with particle-in-cell simulations, and we present gain estimations for single and multiple stages of rephasing.
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Dates et versions

hal-01342480 , version 1 (11-10-2017)

Identifiants

Citer

A. Döpp, E. Guillaume, C. Thaury, Agustin Lifschitz, Kim Ta Phuoc, et al.. Energy boost in laser wakefield accelerators using sharp density transitions. Physics of Plasmas, 2016, 23 (5), pp.56702. ⟨10.1063/1.4946018⟩. ⟨hal-01342480⟩
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