Abstract
An ultrashort laser pulse propagating in plasma can excite a nonlinear plasma wake field which can accelerate charged particles up to GeV energies within a compact space compared to the conventional accelerator devices. In this paper, the effect of different kinds of nonlinear chirped Gaussian laser pulse on wake field generation is investigated. The numerical analysis of our results depicts that the excitation of plasma wave with large and highly amplitude can be accomplished by nonlinear chirped pulses. The maximum amplitude of excited wake in nonlinear chirped pulse is approximately three times more than that of linear chirped pulse. In order to achieve high wake field generation, chirp parameters and functions should be set to optimal values.
Highlights
An ultrashort laser pulse propagating in plasma can excite a nonlinear plasma wake field which can accelerate charged particles up to GeV energies within a compact space compared to the conventional accelerator devices
It has been shown that the main pulse shape and its oscillation have an essential effect on wake field generation
The more oscillation of the main pulse leads to decreasing behavior of the wake field generation
Summary
Laser plasma interaction has been received worldwide research interest because of wide-ranging applications in laser induced fusions, laser wake field accelerators, industries, biologies, medical sciences, subatomic matter interactions, nuclear reactions, high energy physics, etc.[1,2,3,4,5,6,7,8] Lots of developments of ultrashort high power lasers have been carried out with progress in ultrashort laser technologies such as chirped pulse amplification.[9,10,11,12,13] The interaction of an intense short laser pulse with under dense plasma can produce accelerating gradients, thousands of times, higher than conventional accelerators.[14,15,16] Plasma wake can travel at the group velocity of laser pulse, close to the speed of light, in order to accelerate particles up to relativistic velocities. In 2004, Khachatryan et al.[17,18] showed the possibility to greatly increase the plasma wake field which is generated by the chirped laser pulse. This can be the result of receiving a nonzero transverse momentum of the plasma electron which increases the effective mass of the plasma electron. This fact leads to an enhancement of the nonlinear plasma wavelength. The theoretical and experimental work in the field of chirped laser pulse interaction with plasma has been investigated in detail.[25,26,27,28,29,30,31,32] Pathak et al illustrated the effect of
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