DESIGN AND CONSTRUCTION OF RF COUPLING COIL FOR THE MICE
Keywords:
RF coupling coil, MICE, impedance matching, S-parametersAbstract
An optimized radio-frequency (RF) coupling coil has been developed for application in the Muon Ionization Cooling Experiment (MICE) to enhance power transfer efficiency, electromagnetic field stability, and beam-cavity interaction performance in high-gradient accelerator environments. The design framework integrated Maxwell’s equations, impedance matching theory, and S-parameter analysis to achieve efficient coupling between the RF power source and the accelerating cavity under strong solenoidal magnetic fields and cryogenic operating conditions. Electromagnetic simulation and experimental validation demonstrated a significant improvement in RF performance metrics. The reflection coefficient (S11) was reduced from −18.5 dB in conventional configurations to −32.7 dB in the proposed design, indicating superior impedance matching. Correspondingly, the transmission coefficient (S21) increased from 0.68 to 0.91, yielding an RF power transfer efficiency improvement from 68% to 91%. The coupling coefficient approached near-critical coupling at β ≈ 1.02, ensuring optimal energy delivery into the TM010 cavity mode. Thermal analysis showed reduced localized heating due to improved current distribution, while mechanical stress remained within acceptable structural limits. Enhanced electromagnetic field symmetry and improved Q-factor stability were also observed. The results confirm that optimized RF coupling coil design significantly improves operational performance in muon ionization cooling systems and provides a robust solution for next-generation accelerator applications requiring high efficiency and stability.
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