Electron cyclotron heating is one of the methods of additional plasma heating and noninductive current drive in the T-15MD tokamak. One to eight gyrotrons with a total power up to 7 MW will be used. The frequency of the microwave used depends on the parameters of the experimental scenarios in which the heating will be used and on the physical tasks for which it is intended. This article provides justification for the choice of the gyrotron frequency f(1) congruent to 82.6 GHz for the start-up phase and for the first plasma experiments and considers the possibility of using this frequency at the stage of full-scale experiments. In order to provide flexibility of the T-15MD ECH system, it is proposed to consider the possibility of the development of a gyrotron complex based on two-frequency gyrotrons with f(1) similar to 82.6 GHz and f(2) in the range of similar to 102-110 GHz.
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