Power measurement is necessary for an electron cyclotron resonance heating (ECRH) system. The dummy load is one of the significant equipment for the millimeter wave power measurement. In this paper, The dummy load is analyzed based on the quasi-optical method and the ray tracing method. The reflectivity and thermal deposition of the dummy load has been considered to ensure the safety of the whole system. High-power tests have been carried out at a 105 GHz/500 kW ECRH system. The results of the tests indicate that the dummy load is stable and valid.

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