Based on the classical Thomson scattering theory, we theoretically study the electron trajectory and spectrum generated during the frontal collision of electrons with a tightly focused circularly polarized laser pulse. The results show that there is a linear relationship between the initial z-axis coordinate z0 of the electron and the collision center. The increase in the initial energy and the initial z-axis coordinate of the electron will cause the concentration of the longitudinal motion of the electron and the redshift of the spectrum. The difference between the two is that the higher the initial energy of the electron, the smaller the transverse motion of the electron, and the higher the maximum single harmonic energy of the spectrum, while the increase in the initial z-axis coordinate of the electron will cause the interference fringes of the spectrum to increase first and then decrease, and the maximum single harmonic energy will decrease overall, with a jump point at z0 = 15λ0.
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