BackgroundElectron 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. https://cosmeticssquadets.shop/product-category/keys/