High Power Millimeter Wave Amplifier

The objective of this program is to design a high power pulsed amplifier for millimeter wave operation. The development is limited to the consideration of gyrotron-type amplifiers which involve an interaction based on cyclotron resonance. The present program was preceded by a Phase I study effort which explored the feasibility of gyroklystron amplifiers with cyclotron harmonic operation. The first interim report for Phase II covered the completion of testing of the X-band gyroklystron built under the previous study program. This report describes results on the first TE11 mode gyro-TWT experiment which demonstrated some net gain. The gain figures were somewhate lower than expected due to large launching losses. At the end of this reporting period, the tube had been rebuilt with an increased length and was essentially ready for test.