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In this paper, the design of a magnetron injection gun (MIG) with a single-anode built for W-band gyrotron oscillator is presented. The simulation of the MIG is finished with the help of a trajectory program EGUN. The simulation results indicate that the velocity ratio with velocity spread of less than 4% is 1.41.
Micro-reentrant square cavities operating at high order modes have been demonstrated to be a viable solution for the realization of millimeter wave klystrons. However, the excitation of the required high order mode is a challenging task. The realization and measurement of a novel coupler for high order mode cavities is proposed.
A novel model of the compact high power 264 GHz CW Extended Interaction Oscillator has been developed by CPI Canada. By combination of mechanical tuning and electronic switching between two operating modes, this EIO provides over 1 W of power in the range of 258 to 270 GHz. Liquid cooling is used to stabilize RF circuit temperature and prevent frequency detuning. Further development is ongoing to...
A modified slotted helix slow-wave structure is proposed to develop high-power, wide-bandwidth millimeter TWT. The electromagnetic characteristics are calculated by HFSS. The results show that the modified structure has higher interaction impedance and lower attenuation compared with original slotted helix SWS, which would lead to higher output power in millimeter-wave TWT.
A Ku-Band high power Gyro-TWT is designed and the experiment hot test has been finished. The operating mode is TE11 mode. A linear polarized input coupler is used to introduce the input power. The start-oscillation current of operating TE11 mode and the backward TE21 mode is studied by the linear, non-linear self-consistent theory and 3D PIC simulation. The loss ceramics are used in the HF circuit...
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 realization of millimeter wave klystrons is limited by cavity dimensions. High order mode cavities permit larger dimensions for a same frequency, but their low Q and R/Q are not adequate for klystron realization. A new topology of klystron is proposed to effectively support high order mode cavities at millimeter waves.
A new way to control the electron beam current is proposed based on nonrelativistic electron beam and millimeter wave interaction. Simulation shows specific high harmonic current was generated while other harmonic components were suppressed. This current can be used to generate terahertz wave by a new beam wave interaction process.
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