Newly developed injection mode of PLS

At the Pohang Light Source, 2 GeV electron beam had been injected to the storage ring and increased to 2.5 GeV using an energy ramping system previously. This ramping process was regarded as a source of closed orbit distortions. The successful upgrade of injection power of the PLS linear accelerator has enabled to develop the full energy injection mode, where 2.5 GeV electron beam is injected and synchrotron radiation is provided to the photon beamlines without the ramping process. With the constraints of preserving the so called "golden orbit" and parameters something like betatron tunes, new optimized sets of magnetic fields are searched for, taking into account of possible septum magnetic field leakage. The observed results and improvements after the newly employed injection mode are reported.