Energy-chirped electron beam free electron laser amplification chirped pulse

Energy Chirped Electron Beam Free Electron Laser Amplified Chirped Pulsed Beam Xiaojian Peng Tangchao 2, Dou Yuhuan 1 (1. Beijing Institute of Applied Physics and Computational Mathematics, Beijing 100088; 2. School of Physical Science and Technology, Wuhan University, Wuhan 430072) and slide The effect of migration phenomenon. Using the developed one-dimensional non-stationary program GOFEL-P, the process of amplifying the chirped pulses of the energy-chirped free electron laser amplifier was numerically simulated and analyzed, and the extra-cavity compression of the pulses with different chirped parameters after being amplified was calculated. . The results show that the energy-chirped free-electron laser can amplify chirped pulses with larger chirp parameters than single-energy electron beams, increasing the peak power of the compressed pulse to 568GW and shortening the pulse width to 2.29fs. Enhance the effect of free electron laser amplification of chirped pulses and compression pulses outside the cavity.

Ultrashort pulses propagate in a linear medium with group velocity dispersion (GVD) to obtain a widened linear chirp pulse. If this chirping pulse is a Gaussian pulse, its slow-varying envelope can be expressed as a positive chirping at 2, indicating that the frequency of the trailing edge of the pulse will become larger. The powerful research methods in the field of research have promoted the development and progress of these fields of research. Cough pulse amplification (CPA) technology is a major way to obtain high-intensity ultra-short pulse free electron laser (FEL). From the numerical simulation results of the single-energy FEL amplifier to amplify the chirp pulse, the highest peak power reached when C = 50 is 63.3GW. Therefore, the effect of the FEL amplifier using energy-embedding electron beam to amplify the chirp pulse is much better than that of the single-energy The effect of the electron beam FEL amplifier, the amplified chirp pulse can be compressed to obtain a peak power that is nearly an order of magnitude higher. After 300, the peak power of the pulse after compression will decrease. This is because the increase in the C value will increase the detuning of the chirping pulse after each wavelength of the slip. Therefore, an excessive C value is the amplification and compression of the pulse. Adverse.

The minimum width of the pulse shown in (b) after compression is 2.29fs (C = 350), which is nearly an order of magnitude smaller than the simulation result of the single-energy electron beam amplification chirp pulse in 18.5fs. This is mainly due to the energy-coughing electron beam which greatly increases the gain line width of the FEL amplifier, which can amplify the coughing pulse with a large C value, greatly improve the pulse compression ratio of the pulse, and make the pulse width compressed shorter.

3 Conclusion Using the one-dimensional non-stationary program GOFEL-P, the process of enlarging the pulse of energy coughing FEL is numerically simulated and analyzed. The results show that: energy cuffing FEL can significantly increase the pulse power gain and increase the FEL The gain line width can amplify the chirping pulse with a large C value, greatly improving the pulse compression ratio of the pulse. Compared with the single-energy electron beam, the peak power of the pulse after compression is increased and the width is shortened by nearly an order of magnitude, which greatly improves the compression effect of the FEL amplified chirp pulse and the extra-cavity pulse. The results of numerical simulations preliminarily verify that FEL using energy-chirping electron beam can directly generate chirping pulses. How to use FEL amplifier with energy coughing electron beam to generate and amplify coughing pulse will be our further research work.

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