TRANSFORMATION RATIO AT PLASMA WAKEFIELD EXCITATION BY LASER PULSE WITH RAMPING OF ITS INTENSITY ACCORDING TO COSINE
Abstract
Plasma wakefield excitation by shaped laser pulse, the intensity of which slowly increases up to its maximum in longitudinal direction according to cosine and sharply cuts off at the tail of the pulse, is numerically simulated with the purpose to increase the transformation ratio. The transformation ratio determines the maximum energy, to which electrons can be accelerated, and it is estimated by the ratio of the amplitude of the wake wave after the pulse and the amplitude of the plasma perturbation within the pulse. The length of the shaped laser pulse is selected to be longer than the plasma wavelength. The radius of the pulse is selected to be much smaller than its length. It is shown that for the considered type of laser pulse shaping with these parameters the transformation ratio can be much larger than the limiting value of two, which follows from Wilson theorem developed for particle bunch, and which corresponds to any symmetric particle distribution in a bunch.
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References
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