Pulse antenna in application of high power laser target electromagnetic pulse diagnosis

Massive electromagnetic pulses could be generated by the interactions between intensive laser and solid targets in inertial confinement fusion (ICF), leading to the inaccuracy of experimental data and even the malfunction of diagnostic facilities. A method for diagnosing electromagnetic pulses (EMP) generated by laser illuminating solid targets was presented. A conical antenna was designed and simulated to obtain the attenuation coefficient, 3D gain and other parameters of the antenna physical model. The in situ monitoring the target process was performed to evaluate the value of electromagnetic radiation and electric voltage, by which the time-domain distribution of electromagnetic impulse was expected. The experimental results indicate that the intensity of electromagnetic radiation is related to many factors, such as the power of laser, the way of laser shooting, and angle of incidence. As for planar targets, if image and material are the same, EMP engendered by laser with different power has the similar energy spectral density (ESD) and the identical characteristic frequency. The results are expected to offer significant experiment information to study physics mechanism regarding the interactions between laser and target, which will also lay foundation for the later EMP shielding design for the important diagnostic facilities in ICF experiment.