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Experimental verification of time‐average forces due to an rf field acting on charged particles is obtained by measuring the transmission of an electron beam through the high‐frequency fields of a cavity. By adjusting the external dc magnetic field so that cyclotron resonance is approached, it is possible to reflect high‐energy beams; that is, 66 w of microwave power completely reflected a 24‐v beam. Agreement between experiment and theory was close.