Electron cyclotron resonance heating (ECRH) is an important heating and plasma current control method for the HL-3 tokamak. Microwave inject into plasma through the launcher, which is an important part of the ECRH system. The ECRH launcher system of HL-3 tokamak consists of three launchers, including a mid equatorial launcher and two upper launchers. All launchers are located in the same sector, and can work together to complete functions such as heating and Neoclassical Tearing Mode (NTM) control.

This study aims to design and test the ECRH launcher system of the HL-3 tokamak.

First of all, the overall planning was carried out for the launcher system. Subsequently, the transmission path and structure of the launcher were designed, and the effect of microwave injection were calculated by simulation. Then, detail design and implementation for the mid-equatorial launcher and No.1 upper launcher were completed, so did the optical path design for No.2 upper launcher. Finally, the transmission angle and rotation speed of the launcher were tested, and the rotation angle of the launcher was calibrated.

The full range response time of the mid-equatorial launcher is less than 90 ms. The full range response time of the No.1 upper launcher is less than 190 ms.

The control of the equatorial launcher and the No.1 upper launcher is precise and fast, meeting the requirements for experimental use of the tokamak.