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ABSTRACT: Pohang Accelerator Laboratory has obtained a full funding to upgrade Pohang Light Source. In the PLS-II storage ring, three elliptical superconducting RF cavities of 500 MHz will be used for accelerating an electron beam with energy of 3.0 GeV, and working at temperature of 4.4 K. Each cavity is powered by one set of high power source, and controlled by one set of digital LLRF and control system. The cryomodules are cooled by a cryogenic plant of 700 W.