The CYCIAE-14 project was launched by BRIF division of CIAE in year 2010, to build a 14MeV compact proton cyclotron for medical applications. The beam energy, intensity as well as other parameters of the machine is selected in such a way, so that the cyclotron-based production of technetium-99m (Tc-99m) can be evaluated. The commission of this cyclotron was successfully finished in the middle of year 2012, with extracted beam energy equals to 14.6MeV and intensity high than 100uA. The RF system of the CYCIAE-14 cyclotron includes a set of lambda by four cavities (connected with each other under central region), a 20kW triode amplifier and related 1 inch rigid line power transmission system. It also includes a set of Low Level RF control circuits, which takes advantages of modern digital technologies such as DSP and DDS to achieve close-loop regulation of the accelerating voltage and frequency. The design of this RF system starts from the middle of year 2010. Most of the equipments are manufactured and shipped to site before the end of year 2011. The installation and commission of this RF system was started in the beginning of year 2012 and finished about 3 months later, the measured voltage stability is better than 0.1%. The design and difficulties in the commission was reviewed in this paper, on particular, the instability introduced by transmission line taped with high Q load as well as the problems caused by RF leakage during the commission was also analyzed.
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