Realistic 3-D Particle-In-Cell Simulation of a Medical 2.1 MW 40-Vane X -Band Coaxial Magnetron

• Published in: IEEE transactions on electron devices 2023-03, Vol.70 (3), p.1262-1269
• Main Authors: Lee, Jeong-Hun, Kim, Geun-Ju, Kim, Sanghoon, Lee, Yong-Seok, Kim, Insoo S., Jang, Kwang-Ho, Kim, Jung-Il
• Format: Article
• Language: English
• Subjects: Magnetic circuits; Magnetic fields; Parameters; Particle in cell technique; Simulation; Spokes; Waveguides
• ISSN: 0018-9383; 1557-9646
• DOI: 10.1109/TED.2023.3236349

A medical 2.1 MW 40-vane [Formula Omitted]-band coaxial magnetron is designed and analyzed using a 3-D particle-in-cell (PIC) simulation. For realistic simulation, the magnetic field profile from the 3-D magnetic circuit and the structure of the output window are included in the simulation. A frequency tuner is located inside the coaxial resonator to control the operating frequency, and the output power is measured at the WR-112 waveguide located behind the output window. Using the operating conditions with an anode voltage of 35.8 kV and a magnetic field of 0.595 T, a maximum output power of 2.1 MW with an efficiency of 53.6% is measured in the stable [Formula Omitted]-mode resulting from the 20-electron spokes. The frequency tuner is moved down and up by [Formula Omitted] along the axial direction, and the frequency bandwidth is 72 MHz from 9.272 to 9.344 GHz with the tuning parameter of 0.12 MHz/[Formula Omitted]. In addition, the output performance is simulated to investigate the effect of dimensional parameters such as the coupling slot width and transformer length.