Abstract:
Background The quasi-square wave output characteristic of a PFN-Marx generator is a pair of contradictions with the compactness of the setup. With the higher requirement of the compactness of the setup, the inter stage electromagnetic coupling of PFN wave transmission becomes increasingly significant, which has a significant effect on the pulse modulation characteristics of the PFN and further affects the quasi-square wave output characteristics of the generator.
Purpose It is necessary to investigate the electromagnetic coupling during the wave transmission process of the PFN-Marx generator and derive the corresponding calculation formulas. This allows for the avoidance of specific electromagnetic couplings during the design phase, ensuring both the quality of the output waveform and the compactness of the device.
Methods This paper presents an electromagnetic coupling analysis of the PFN during the discharging process of PFN Marx generator. Firstly, the electromagnetic coupling phenomena in the PFN and between the PFNs are analyzed by theoretical derivation, and the calculation formulas are obtained. Then, the 3D model of the typical PFN Marx generator is built up for field circuit simulation. Finally, a single-stage generator and a multi-stage generator are built for experimental verification.
Results The experimental results verify the theoretical analysis and simulation results, showing good consistency. The preliminary design optimization directions for the PFN-Marx generator can be outlined as follows: 1. Maintain appropriate inter-wire spacing; 2. Increase design redundancy to compensate for electromagnetic coupling; 3. Keep the transmission lines neat and regular to minimize unnecessary electromagnetic coupling.
Conclusions Based on the above results, the understanding of electromagnetic coupling in the wave transmission of PFN-Marx generator can be improved, so as to avoid partial electromagnetic coupling in design and improve the square wave output ability of PFN-Marx generator. This paper can provide technical reference for the development of quasi-square wave technology and compact technology of the PFN-Marx generator.
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