Present status of the OPU electron accelerators for the multipurpose applications

In Radiation Research Center, Osaka Prefecture University (OPU) 18 MeV electron linear accelerator and 600 keV Cockcroft Walton electron accelerator have been used for scientific and industrial researches in various fields. These accelerators were constructed 40-50 years ago. For supplying stable beams to many user experiments the accelerator components have been improved. For performing the characteristic beam applications ultra-low intensity beams and coherent THz light sources have been developed. The recent application researches of the electron beams and the future plans are reported. (author)