TITLE

Frequency chirp and pulse shape effects in self-modulated laser wakefield accelerators

AUTHOR(S)
Schroeder, C. B.; Esarey, E.; Geddes, C. G. R.; Tóth, Cs.; Shadwick, B. A.; van Tilborg, J.; Faure, J.; Leemans, W. P.
PUB. DATE
May 2003
SOURCE
Physics of Plasmas;May2003, Vol. 10 Issue 5, p2039
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The effect of asymmetric laser pulses on plasma wave excitation in a self-modulated laser wakefield accelerator is examined. Laser pulse shape and frequency chirp asymmetries, controlled experimentally in the laser system through a grating pair compressor, are shown to strongly enhance measured electron yields for certain asymmetries. It is shown analytically that a positive (negative) frequency chirp enhances (suppresses) the growth rate of the Raman forward scattering and near-forward Raman sidescatter instabilities, but is of minimal importance for the experimental parameters. Temporal laser pulse shapes with fast rise times (≲ plasma period) are shown to generate larger wakes (compared to slow rise time pulses) which seed the growth of the plasma wave, resulting in enhanced electron yield.
ACCESSION #
9572985

 

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