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We present a technique for time-domain measurement and predistortion of complex wideband waveforms in a Ka-band helix TWT power amplifier. The measurement technique relies on a hybrid calibration procedure that uses both single tone and wideband multitone calibration for characterizing the amplifier response to simultaneous excitation across its operating frequency band. We compare our measurements...
Recently, a set of instrument named Electron Beam Measuring and Analyzing System (EBMAS) has being built in Institute of Electronics, Chinese Academy of Sciences (IECAS), which can be used to measure the dynamic parameters for the high power electron beam during its formation and transport for microwave vacuum electron devices. In this paper, the EBMAS with its measurement of cross section, current...
The experimental study of a Q-band gyrotron-travelling-wave tube (gyro-TWT) amplifier operating in the circular TE01 mode at fundamental cyclotron harmonic is presented. A periodic dielectric loaded structure is adopted in the interaction circuit of the gyro-TWT to suppress spurious modes TE11 and TE21. A saturated peak power of 175 kW is obtained corresponding to saturated gain of 53 dB and an efficiency...
This paper describes RF performance on a Ka/Q-band mini-TWT. An output power of greater than 80 W has been demonstrated in the Ka and Q communication bands.
In order to build an X-band sheet beam klystron with the peak output power of 5 MW, a high frequency structure has been designed through the three dimensional particle-in-cell simulations. The design method is consist of two steps, which are firstly finding a stable single-arm output cavity with the high energy extraction ability and secondly constructing a multi-cavity bunching section to produce...
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