KAERI, Daejon
PAL, Pohang, Kyungbuk
A superconducting RF cavity with a geometrical beta of 0.42 and a resonant frequency of 700 MHz has been designed to accelerate a proton beam above 100 MeV for an extended program of Proton Engineering Frontier Project (PEFP). The designed cavity is an elliptical shape with 5 cells stiffened by double-ring structure. A design accelerating gradient is 8.0 MV/m at the operating temperature of 4.2 K and a maximum duty factor is 9 %. In order to confirm the fabrication procedure and check the RF and mechanical properties of the designed cavity, two niobium prototypes are under development. One is a two-cell cavity mainly for a quick prototyping with the surface treatment study and the other is a five-cell cavity. For vertical test of the niobium cavities, test equipment such as a cryostat, RF amplifier and LLRF control system is under preparation. The status of the niobium protype development and preliminary results for the vertical test will be presented in this paper.
