Fast impedance matching for the ion cyctron resonance heating system based on capacitors at the EAST tokamak

This paper presents an impedance matching system based on real-time feedback control, designed to address impedance mismatching issues in radio frequency (RF) systems. The proposed system integrates a directional coupler, a double-section impedance matcher, a variable capacitor, a servo motor, and a fast real-time impedance matching feedback control system. By measuring forward and reflected power via the directional coupler, the system dynamically adjusts the capacitance to achieve optimal matching. The real-time feedback mechanism controls the servo motor to adjust the capacitor’s value, thereby fine-tuning to the desired level. Experimental results show that the system can significantly reduce reflection power in less than 1 second, demonstrating fast response and high efficiency. The proposed solution is applicable in wireless communication, radar, and RF power transmission systems, offering improved system performance, reduced energy consumption, and enhanced signal quality.