Study of Mode Control in Long-Anode High-Power Pulse Magnetron

This paper presents an analytical study of long anode magnetron (LAM) resonant structure to have an insight in the designing of this class of magnetrons. The most prominent feature of an LAM is its anode block length, which has the complication of generating higher order axial modes. In addition, this length also affects the effectiveness of strapping in magnetrons. Both of these statements were verified through simulation of long anode hole and slot resonant structure on CST Microwave Studio under the length analysis and strap analysis study. It was attempted to search for an optimized length of anode block by observing the nλ variations for various modes, which resulted in concluding that long anode block length must be near to 0.8λ. In addition, the dispersion curves and Hull-Hartree plots were analyzed for evaluating the effectiveness of strapping, which showed that strapping is not very effective and advantageous in LAM structure.