摘要：HL-2A tokamak will be equipped with a 75 GHz/1 MW/1 s ECRH system. The paper describes the design of the transmission system (Fig. 1), which is made up with a transmission line, an equatorial launcher. The paper describes the design of main components of the system such as, waveguides, ellipsoidal surface mirrors, a chemical vapor (CVD) diamond window, a steering mirror.