Beam dynamics study of sub-harmonic bunching systems in PLS-II

Abstract PLS-II facility accelerates electrons to 3 GeV using a linear accelerator and then injects them into a storage ring for synchrotron light production. The beam quality in the linear accelerator is significantly influenced by the electron source, bunching system. To enhance the existing bunching system in PLS-II, a preliminary investigation into the application of sub-harmonic bunchers was carried out. To analyze and optimize beam performance, beam dynamics simulations were conducted using CST and PARMELA. Two SHB cavity frequencies, 1 GHz and 500 MHz, were considered. An MOGA was utilized to optimize the beam parameters for each SHB configuration. A comparative analysis of beam distributions demonstrated that the use of SHBs could enhance injection efficiency by forming a single main bunch.