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A W-band sheet-beam extended interaction klystron (EIK) has been fabricated and tested. The EIK integrates a 3-cavity circuit with our previously demonstrated 20-kV, 3.5-A beamstick. The EIK has produced a saturated peak output power of over 7.5 kW and a small-signal gain of almost 40 dB, in very good agreement with our simulations.
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...
Modeling a gyrotron cavity in 3D and timedomain is very challenging due to the open-end features of cavity structure and higher-order mode excitation employed to achieve high efficiency. In this work, a conformal finite-difference time-domain (CFDTD) method is proposed to simulate a gyrotron cavity and a particle-in-cell (PIC) algorithm is used to describe a gyro electron beam. Our preliminary result...
The w-band sapphire pillbox window had been designed in the article, with a bandwidth larger than 4GHz while VSWR less than 1.2. Structural parameters' effects on the bandwidth were analyzed and a relatively realizable assembling and welding structure was given out.
A five waveguide output structure is proposed in order to improve the microwave power propagation capability for gyro-devices applications. The simulations and experiments were performed for analyzing the transmission characteristics of the structure. The results show the simulations are in good agreement with the experiments, which is beneficial for gyro-devices applications.
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