KAERI, Daejon, Republic of Korea
For the future extension of the PEFP (Proton Engineering Frontier Project) proton linac, a study on the SRF technology has been performed including a prototype cavity development to confirm the design of the cavity and fabrication procedures and to check the RF and mechanical properties of a low-beta elliptical cavity. The geometrical beta and resonant frequency of operating mode are 0.42 and 700 MHz, respectively. The cavity is a five-cell structure stiffened by double-ring structure to increase mechanical stability. For the vertical test of the cavity, RF system based on PLL (phase locked loop) has been prepared. If there is no magnetic shielding and operating temperature is 4.2 K, the required RF power to generate the design accelerating field of 8 MV/m is estimated to be about 320 W at critical coupling. In case single RF amplifier cannot deliver sufficient RF power, a coaxial type two-way RF combiner is under consideration. The details of the cavity test setup and results will be presented in this paper.
