Numerical Simulation Research on Inter-electrode Capacitance of High-power Electronic Tetrode

Abstract

High-power electronic tetrode is the RF wave transmitting component in the ion cyclotron range of frequency (ICRF) heating system in EAST. In high-frequency use, its inter-electrode capacitance is an important factor that cannot be ignored, which will have a significant impact on the operating frequency and output power. Based on the theory of electrostatics and considering the influence of each electrode, this paper established a three-dimensional solid model of the electronic tetrode, and the numerical simulation about the inter-electrode capacitance is calculated by the finite element software COMSOL. The obtained inter-electrode capacitance simulation calculation values are all within the actual test value range. On this basis, the relationship between the inter-electrode capacitance and the inter-electrode distance is studied, and the adjustable range of the electrode diameter is calculated. The finite element numerical simulation method calculated the inter-electrode capacitance of high-power tetrodes and the quantitative relationship between the inter-electrode capacitance and inter-electrode distance more accurately, which can provide a reference for the simulation and design of megawatt-level electronic tetrodes in the future.