| Paper | Title | Page |
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WEPP25 |
Design of a Dielectric-Filled Cavity Beam Current Monitor for HUST-PTF | |
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| A dedicated proton therapy facility, HUST-PTF (Huazhong University of Science and Technology Proton Therapy Facility) is being developed in Wuhan. With respect to the proton therapy facility, non-destructive beam diagnostic devices are essential to guarantee the online measurement during the patient treatment. In order to meet the clinical requirement, the proton beam current varies from the 0.35-5 nA. Extremely low beam intensity is a great challenge to non-destructive beam current detection. Conventional beam current monitors used in proton therapy facility, ionization champers, will cause beam scattering and the monitor activation, etc. To mitigate this issue, we design a non-invasive beam current monitor based the principle of dielectric-filled reentrant cavity. The fundamental mode of the cavity was employed as the working mode and its working frequency of 146 MHz was matched to the second harmonic of the pulse rate. The CST Microwave Studio was used for electromagnetic modeling and design parameters optimization. We evaluated the effect of the different proton energy due to the degrader on the output signal. The electronics based on a commercial lock-in amplifier is proposed to perform the demodulation of induced signal and we evaluated the signal-to-noise ratio and the beam current resolution. The results of the design studies show that the dielectric-filled cavity resonator is a potential candidate for non-destructive beam current detection in HUST-PTF. | ||
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