With Maxwell equation and Newton equation as a starting point, according to the present situation cannot be directly measuring the parameters of the ultrahigh laser, the theoretical derivation and numerical simulation method is deduced low-energy single electron acceleration model, and through MATLAB iteration, studied and analyzed the different polarization parameters of the laser pulse order electronic movement rule and the characteristics of space radiation. The results show that as the polarization parameterincreases from 0 to 1, the spatial distribution of electron energy radiation changes from linear plane to spiral shape, and the overall trend can be divided into four stages. The trajectory of the electron also changes from the plane oscillation to the spiral, and the radius of the spin gradually increases, and the decreasing speed of the radius after the peak also slows down. Based on the above research, the theoretical and numerical simulation basis is provided for the experimental study of high-energy electron radiation in full time, full space and the anti-detection of various parameters of laser.
The influence of pulse width on relativistic motion and full spatial characteristics of radiation generated from electron oscillations driven by circularly polarized intense femtosecond laser pulses have been investigated theoretically and numerically using a single electron model. The electron trajectories show asymmetric spiral patterns for few-cycle laser pulse which do not resemble with twofold symmetric spiral patterns in the multi-cycle laser pulse. It is discovered that the patterns of the full spatial distribution of electron emission are of the shape resembling a flower of calla for few-cycle laser pulse and the radiated power per unit solid angle show a horn like shape directed toward the direction of the laser pulses propagation with a narrower divergence for multi-cycle laser pulse.
In this paper, through numerical simulation, the effect of initial phase on nonlinear Thomson scattering in a Gaussian laser pulse under tight focusing is studied. It is found for the first time that the initial phase is out of synchronization with the maximum radiation angle. When the initial phase changes from 360° to 180°, the maximum radiation distribution appears multi peak phenomenon, and the degree of the initial phase angle is different from that when the initial phase changes from 0 to 180 degrees., it shows an antisymmetric variation law. Furthermore, we discuss the process and reason of this phenomenon, which provides a accurate observation time and theoretical basis for high energy electron radiation experiment.
In this paper, based on the Lorentz equation and Maxwell's equations the single electron acceleration model was established, we use MATLAB to study the electron dynamics and radiation emission in the field of a relativistic intense laser pulse. In the spatial distribution of the electron appear "ramifications", and the intensity of electron radiation angle of peak time spectrum showed that, when the beam waist radius from 7λ0 to 4λ0, the main peak change from multiple into a single gradually, from 4λ0 the main peak symmetric bimodal pattern is obvious damage, and the intensity of the main peak is mainly on the left side. The radiation peak is positively correlated with the beam waist radius while the pulse width is just the opposite. Combining with the electronic motion images, we find that the change of the growth trend also occurs at 4λ0 and 7λ0. It marks that, it's possibly that there is an intermediate state between the tight-focused and the non-tight-focused.
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