Improvements in the rf system for the Photon Factory Advanced Ring (PF-AR)

The Photon Factory Advanced Ring (PF-AR) is a 6.5-GeV synchrotron light source at KEK. An rf system for the PF-AR can provide an rf accelerating voltage of about 16 MV. During an upgrading project for the PF-AR, we carried out some improvements in the rf system. This paper reports these improvements, as well as the present operation status of the system.