A novel method for power measurement of a short pulse gyrotron using Friis transmission formula at W-band

In this paper, we introduce a new measurement method for a W-band, high power short pulse gyrotron using Friis transmission equation. The proposed method is superior to other calorimetric measurements since it provides a real-time power measurement and without calibration. To apply to Friis transmission equation, we derive the directivity of Gaussian beam in detail. Also, to demonstrate the method, we measured the output power based on the proposed method and compared with conventional measurement. The results prove that the proposed new power measurement technique works very well without any limitation applying it to higher average and peak power and long pulse duration.