Design and Development of Field Emission Based Magnetron for Industrial Applications Using 3-D Conformal Finite-Difference Time-Domain Particle-in-Cell Simulations

Abstract

This work extends our prior investigation of a field emission-based rising-sun magnetron by progressing from 2-D to a comprehensive 3-D conformal finite-difference time domain (CFDTD) particle-in-cell (PIC) simulations. Leveraging insights from the 2-D CFDTD PIC simulations, which achieved an efficiency of 80% with linear anode current density of 75.67 A/m, applied voltage of 5.2 kV, and a static magnetic field of 0.235 T, our 3-D design envisions a rising-sun magnetron with a 10 cm cavity height and an identical cross-sectional area in the x-y plane to achieve similar performance. The cavity optimization process, accounting for geometric and cavity loading effects, converges at an operating frequency of 2.45 GHz. The streamlined fabrication and assembly of the rising-sun magnetron, differing from conventional strapped magnetrons with thermionic cathodes, highlight its practicality and efficiency for industrial applications. This study not only expands insights from 2D simulations but also offers a comprehensive understanding of the potential and feasibility of 3-D design in real-world applications. The shift from 2-D to 3-D strengthens the design, positioning it as a practical alternative to current industrial magnetrons.