PAL, Pohang, Kyungbuk
A superconducting radio frequency (SRF) elliptical cavity is decided for accelerating a CW electron beam with energy of 3.0 GeV and current of 400 mA in the PLS-II storage ring. The cavity is working at the temperature of 4.4 K and at a frequency of 500 MHz. Three single-cell cavities will be installed into one and a half long-straight sections of the PLS-II storage ring tunnel. Each cavity is powered by one set of high power source, and controlled by one set of digital LLRF and control system. Three cryomodules are cooled by a cryogenic plant of 700 W. In this paper, the cryomodules, high power system, LLRF and control system, and cryogenic system for PLS-II RF system have been introduced.
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.
