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Design and Simulation of Lossy Interaction Structure for Ka-Band Gyro-TWT

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5 Author(s)
Alaria, M.K. ; Microwave Tubes Area, CSIR-Central Electronics Engineering Research Institute, Pilani, India ; Ghosh, S.K. ; Choyal, Y. ; Sinha, A.K.
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In this paper, beam-wave interaction analysis in a Ka-band periodically ceramic loaded gyrotron traveling-wave tube (gyro-TWT) amplifier is investigated using particle-in-cell (PIC) simulation. The simulations predict that the interaction structure can produce more than 80-kW output power, 50-dB saturated gain, and 3-dB bandwidth is 2.56 GHz for 65 kV and 5-A electron beam with velocity ratio (\alpha ) of 1.2. The dispersion and interaction impedance characteristics of the ceramic-loaded gyro-TWT amplifier are also determined using 3-D simulator CST-microwave studio. This paper describes the design and simulation of a high performance 35-GHz {\rm TE}_{01} mode gyro-TWT that applies the same technique of employing a periodic dielectric loaded interaction structure to achieve stability and wide bandwidth. The stability of this gyro-amplifier is excellent and demonstrates that the ceramic loading is highly effective for suppressing the spurious oscillations in gyro-TWT.

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Plasma Science, IEEE Transactions on  (Volume:41 ,  Issue: 8 )