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The transmission of High-Power Microwave (HPM) with a frequency of 1 GHz in a plasma double-line induced by intense femtosecond laser pulses is discussed by CST software. The influence of plasma electron density and collision frequency on HPM transmission performance is analyzed especially. The simulation results indicate that, the influence of plasma electron density on the transmission performance of HPM along the double-line is slight when the electron density is in the range of 1015 cm-3 ~1017 cm-3. It can also be obtained that the incident EM wave can propagate around the plasma double-line rather than in the over-dense plasma. We also discover that the attenuation value of the EM wave increases significantly with increasing the plasma collision frequency. Meanwhile, the attenuation value of the EM along the plasma transmission line can be calculated at approximately 0.94 dB/m and 1.56 dB/m when the plasma collision frequencies are 6×109 Hz and 1.5×1011 Hz, respectively. As can be seen, it is not necessary to increase the electron density of femtosecond laser plasma for achieving a high HPM transmission performance in the future applications.
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Yang Liu, Shouye Lv, Jinzhou Li, Xiaobin Li, Yan He, Jiaming Shi, "Simulation analysis of the HPM propagation along the femtosecond laser plasma double-line," Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126173S (4 April 2023); https://doi.org/10.1117/12.2666127