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In an effort to discuss the evolution process of high-energy electron radiation in circular-polarized intense laser pulse with time in detail, a model describing the interaction between a high-energy single electron and intense laser pulse is built on the basis of Lagrange equation and electron energy equation. It is clearly illustrated how electron radiation evolves over time in space, time and frequency domain. By modulating the interaction time between laser and electron and referring to the spatial distribution image of energy, the maximum value and direction of radiation energy per unit solid angle are obtained. Moreover, the impact of the action duration on the radiation power and frequency distribution in this radiation direction is also fully discussed. The findings indicate that the maximum radiation energy per unit solid angle is expected to occur when laser and electron interaction period reaches around 450 fs, and that the time spectrum and frequency spectrum won’t vary considerably after that. As a result, by modifying the duration of the electron-laser interaction, it is possible to more precisely produce the electron radiation with the desired characteristics for the experiment. This has a specific reference value for choosing parameters in practical application settings, which can significantly save costs and improve efficiency.
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