Author(s):
Pathak, V. B. 
; Vieira, J. ; Fonseca, R. A. ; Silva, L. O.
Date: 2012
Persistent ID: http://hdl.handle.net/10071/7099
Origin: Repositório do ISCTE-IUL
Document details
Effect of the frequency chirp on laser wakefield acceleration
Description
WOS:000302310200002 (Nº de Acesso Web of Science) “Prémio Científico ISCTE-IUL 2013” The role of laser frequency chirps in the laser wakefield accelerator is examined. We show that in the linear regime, the evolution of the laser pulse length is affected by the frequency chirp, and that positive (negative) chirp compresses (stretches) the laser pulse, thereby increasing (decreasing) the peak vector potential and wakefield amplitude. In the blowout regime, the frequency chirp can be used to fine-tune the localized etching rates at the front of the laser. In our simulations, chirped laser pulses can lead to 15% higher self-trapped electrons and 10% higher peak energies as compared to the transform-limited pulse. Chirps may be used to control the phase velocity of the wake and to relax the self-guiding conditions at the front of the laser. Our predictions are confirmed by multi-dimensional particle-in-cell simulations with OSIRIS.
WOS:000302310200002 (Nº de Acesso Web of Science) “Prémio Científico ISCTE-IUL 2013” The role of laser frequency chirps in the laser wakefield accelerator is examined. We show that in the linear regime, the evolution of the laser pulse length is affected by the frequency chirp, and that positive (negative) chirp compresses (stretches) the laser pulse, thereby increasing (decreasing) the peak vector potential and wakefield amplitude. In the blowout regime, the frequency chirp can be used to fine-tune the localized etching rates at the front of the laser. In our simulations, chirped laser pulses can lead to 15% higher self-trapped electrons and 10% higher peak energies as compared to the transform-limited pulse. Chirps may be used to control the phase velocity of the wake and to relax the self-guiding conditions at the front of the laser. Our predictions are confirmed by multi-dimensional particle-in-cell simulations with OSIRIS.
Document Type
Article
Language English
Language English
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