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).