RF system adjustment in ramping process of HLS

HLS (Hefei light source) is a dedicated synchrotron radiation light source, where charged beam with low energy is injected and accumulated in the ring, and then the beam is synchronously accelerated to high energy and circulates in storage ring. During ramping process, with the drastic increasing synchrotron radiation energy loss of particle, beam loading is changing and appropriate adjustment of RF parameters is necessary in order to keep beam stability. In this paper, two possible RF adjustment modes for ramping in HLS are discussed and optimum RF status during operation in high energy is calculated.