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A high-order-mode harmonic multiplying gyrotron traveling-wave amplifiers (gyro-TWA) with large circuit dimensions and low ohmic loss can achieve a high average power. Wall losses can suppress some competing modes; however, such wall losses do not suppress all competing modes in the gyro-TWA. An improved mode-selective circuit can provide the rejection points within the frequency range to suppress...
Backward wave oscillation modes in a TE01 Gyro-TWT are researched by a nonlinear theory with consideration of electrons misalign. The results show the output power of most oscillation modes decreases with the increment of misaligns distance.
A high-order-mode harmonic multiplying gyro-TWA could allow the amplifier to achieve high average powers. An improved mode-selective circuit is employed for suppressing non-TE0n competing modes while wall losses are employed for suppressing TE0n competing modes. A G-band second harmonic multiplying gyro-TWT is predicted to yield a peak output power of 56 kW at 200 GHz with an efficiency of 11%, a...
In this paper, design of the interaction structure to generate 2THz radiation at second cyclotron harmonic is presented. Based on start oscillating current and stability at high magnetic field, TE24,4 is selected as operating mode. The eigen mode analysis and beam wave interaction in the interaction structure have been carried out using MAGIC and CST-Microwave Studio.
Amplification studies of a Ka-band harmonic multiplying gyrotron traveling wave tube are reported. Coupled cavity and the precise control of focusing magnet field were used to improve the coupling between the fundamental and the harmonic and to adapt the sensitivity of the effect of focusing magnet field on the beam-wave interaction in the tube with a high order mode operation. Some experimental phenomena...
Some experimental phenomena of a harmonic multiplying gyrotron traveling wave tube operating in 8 mm band has been discussed in this extended abstract, it has been found that the output power of the tube decreased with the increase of the filament power and its bandwidth increased with the decrease of the output power for the same beam current.
Theoretical studies and computer simulation show that the coaxial gyrotron with two electron beams (CGTB) can increase the output power of gyrotron and even can operate at dual frequency. In this paper, calculation and design of a coaxial gyrotron with two beams is presented for the experimental verification.
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