The heat and electrodynamic calculations of a power input coupler into superconducting cavities of an accelerator's injector with energy recuperation are presented. The design of a double coaxial input of an average power of 2 × 75 kW is described. The heat losses in this device are <0.2, <3.5, and <75 W at temperatures of 2, 4, and 80 K, respectively. The external Q factor of the cavity can be adjusted. The design of the coupler can be modified for inputting an average power of 2 × 250 kW.
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