A 104-MHz ladder interdigital-H radio frequency quadrupole accelerator(T-IH-RFQ)is developed for applying RFQs to heavy ion implantation and accelerator-based mass spectroscopy in recent years at the Institute of Heavy Ion Physics,Peking University.It could accelerate ions with a mass-to-charge ratio of less than 14,from 2.9 keV/u to 35.7 keV/u within a length of 1.1 m.The T-IH-RFQ cavity operating at H21(0)mode was constructed successfully.Based on a well designed rf power feeding system,the cavity was cold measured and tested with high rf power.In the case of cold measurement,the rf properties were obtained using a vector network analyzer with the help of a perturbation capacitor.During a high power test,the inter−electrode voltage was derived from the energy spectrum of x-rays measured by a high purity Ge detector.The results show that the specific shunt impedance of the T-IH-RFQ cavity reaches 178 kΩm,which could meet the requirements of beam dynamics design.
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