Class structure of the Injector Linac control system of SPring-8

Abstract The first section of the Injector Linac for SPring-8 has been constructed and the initial beam meets the specification. This section, from the electron gun to the buncher and monitors, is also used as a test stand for the control software. The concept of Object-Oriented programming was adopted because of the special requirements for the accelerator control. We present an overview of the linac control system and the software architecture.