FIRST BEAM TEST OF ∆ ∆ ∆φ φ-A INITIAL BEAM LOADING COMPENSATION FOR ELECTRON LINACS

The initial beam loading effect may cause serious beam loss in the electron linac of the Super SOR light source (1). Because of the large energy spread, it is difficult to compensate the beam loading with ordinary methods, such as the adjustment of injection timing and ECS (Energy Compensation System). A phase-amplitude (∆φ - A) modulation system has already been developed and tested. First beam test using this system was carried out at the 125MeV electron linac of Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University. Its result shows that our system well corrects the energy spread due to initial beam loading effect. In this paper, we report the results of first beam test.