Influence of magnetic field on the basic electrical quantities of a cyclotron rf cavity resonator

The basic electrical quantities of a resonator determine the operating quantities of an RF cavity resonator. Therefore, the possibility of influence from a magnetic field on the basic electrical quantities of a power RF resonator that is operated in the presence of a magnetic field has been observed experimentally. This observation is important because if the magnetic field affects the basic quantities of the resonator, it could also affect the operating quantities of the resonator. The basic quantities observed were resonance frequency, quality factor, and impedance, whereas the operating quantities observed were generated voltage, transferred RF power, and reflected power. The observed component of the power RF resonator was an RF Dee of the DECY-13 cyclotron in the R&D laboratory of the Indonesian National Research and Innovation Agency. This RF resonator operates at a power of 20 kW. The magnitude of the magnetic field observed was in the range of 6,000 to 12,000 Gauss. The experimental results showed that magnetic field has no effect on resonance frequency, but there is an effect on two other basic quantities: quality factor and impedance. A giant-magneto-resistance phenomenon was observed in the experimental results, and the magneto-inductance phenomenon was presumably present. In the magnetic field range of 10,000 to 11,000 Gauss, the optimum values of the two basic electrical parameters were obtained. In addition, in the presence of a 12,000 Gauss magnetic field, which is the operational value of the DECY-13 cyclotron magnetic field, the values for these quantities did not significantly decrease.