Fig 11 Output power changes with velocity spread when frequency is 29GHz .
Conclusion: This paper designs a Ka band large-orbit gyro-TWT employing large-orbit electron beam and dielectric-loaded structure, which has achieved good effect on small-orbit gyro-TWTs. According to the PIC simulation results, the model performs well in terms of peak output power and bandwidth, with a magnetic field of only 5100 gauss, which can be provided by conventional electromagnetic coils. Compared with the large-orbit gyro-TWT with helically corrugated waveguide, the large-orbit gyro-TWT with periodic dielectric-loaded structure has mature process and high gain. This study provides a basis for the development of the upcoming Ka-band large-orbit TWT.
Acknowledgment : The authors would like to thank the fund from National Key Laboratory of Science and Technology on Vacuum Electronics (6142807210310) and the Key projects of China People’s Police University (2019zdgg001).