Journal
APPLIED PHYSICS LETTERS
Volume 78, Issue 21, Pages 3175-3177Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1373407
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To achieve multi-GeV electron energies in the laser wakefield accelerator, it is necessary to propagate an intense laser pulse long distances in plasma channels while maintaining a proper phase with the accelerated electrons. We have demonstrated a method that allows control of the laser group velocity in long, multistage plasma channels. The control is achieved by modifying the index of refraction through a variation of the plasma density using a segmented capillary discharge. (C) 2001 American Institute of Physics.
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