Optimal design and fabrication of a RF cavity for accelerator mass spectrometry system cyclotron

This study designed a radio frequency (RF) cavity for a cyclotron-based accelerator mass spectrometry (AMS) system. A cyclotron-based AMS system was used to accelerate ¹²C⁻, ¹³C⁻, and ¹⁴C⁻ particles. The experiment results confirmed that three resonant frequencies of the designed RF cavity accelerated the three particles. The RF cavity was a quarter-wavelength resonator (QWR) type and had an external inductor–capacitor (LC) circuit. The operating frequency range of the fabricated RF cavity was 8.5–10 MHz with coupling coefficients of 0.86, 0.99, and 1.11 at resonant frequencies of 8.85, 9.17, and 9.52 MHz, respectively. The reflected power at each frequency was less than 1%.