Abstract
Strong electromagnetic fields are radiated during the operation of the intense electron-beam accelerator (IEBA), which may lead to the nearby electronic devices out of order. In this paper, the research on the electromagnetic radiation characteristic of the gas main switch of a capacitive IEBA is carried out by the methods of theory analysis and experiment investigation. It is obtained that the gas main switch is the dominating radiation resource. In the absence of electromagnetic shielding for the gas main switch, when the pulse forming line of the IEBA is charged to 700 kV, the radiation field with amplitude of 3280 V/m, dominant frequency of 84 MHz and high frequency 100 MHz is obtained at a distance of 10 meters away from the gas main switch. The experimental results of the radiation field agree with the theoretical calculations. We analyze the achievements of several research groups and find that there is a relationship between the rise time (T) of the transient current of the gas main switch and the dominant frequency (F) of the radiation field, namely, F*T=1. Contrast experiment is carried out with a metal shield cover for the gas main switch. Experimental results show that for the shielded setup the radiation field reduces to 115 V/m, the dominant frequency increases to 86.5 MHz at a distance of 10 away meters from the gas main switch. These conclusions are beneficial for further research on the electromagnetic radiation and protection of the IEBA.
Highlights
Intense electron-beam accelerators (IEBA) have been widely used in fields of nuclear explosion simulation, free-electron laser, source of HPM, medicine and environmental conservation.[1,2,3,4] Capacitive IEBA with the advantages of high efficiency, good output waveform, long pulse width, repetitive operation and high impedance,[5,6] has been widely used in the field of high power microwave
The capacitive IEBA is capable of generating a quasi-square wave with voltage of 100-800 kV by adjusting the gas pressure of the gas main switch and full width at half maximum (FWHM) of 160 ns when an impedance-matched load is connected.[11]
A basic conclusion can be drawn that there is a relation between the rise time (T ) of the pulse current flowing through the triggered gas main switch and the dominant frequency (F) of the electromagnetic radiation signal
Summary
Intense electron-beam accelerators (IEBA) have been widely used in fields of nuclear explosion simulation, free-electron laser, source of HPM, medicine and environmental conservation.[1,2,3,4] Capacitive IEBA with the advantages of high efficiency, good output waveform, long pulse width, repetitive operation and high impedance,[5,6] has been widely used in the field of high power microwave. There are still many problems that need to be resolved about the electromagnetic radiation of IEBA, such as what factors affect the dominant frequency and spectrum width of radiation signal, and how to restrain such interference of electromagnetic radiation while ensuring the normal operation of the accelerator. Based on this idea, the electromagnetic radiation characteristic of the gas main switch of a IEBA is investigated in this paper, these electromagnetic transients were measured and have been analysed in terms of their field magnitude and dominant frequency. The experimental results show that the radiation field intensity of the radiation signal is reduced by an order of magnitude at the distance of 10 meters by covering the gas main switch totally with the designed metal shield
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