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The charging of the traveling wave resonator (TWR) of a microwave compressor by a relativistic S-band magnetron that generates microwave pulses with power ≤ 250 MW and duration of ~ 100 ns is described. The short pulse duration determining the resonator charging time and traveling electromagnetic wave increases the electric strength of the resonator. The short duration of the input pulse determines the coupling and Q-factor of the TWR, and it is not necessary to apply an interference switch for energy release. A scheme for releasing energy at a microwave power of ≥ 1 GW using a ferrite circulator is discussed.