Linear theory of large-orbit gyrotron traveling wave amplifiers with misaligned electron beam

Jiao, Chong-Qing; Luo, Ji-Run
November 2010
Physics of Plasmas;Nov2010, Vol. 17 Issue 11, p114502
Academic Journal
A linear theory of large-orbit gyrotron traveling wave amplifiers (gyro-TWAs), which can be applied to analyze the effect of electron beam misalignment, is developed by specializing the corresponding theory of small-orbit gyro-TWAs. The linear theory is validated by comparing with a nonlinear theory. Numerical results show that beam misalignment can reduce linear gain and amplification bandwidth of large-orbit gyro-TWAs and increase the starting length of large-orbit gyro-BWOs for modes in accordance with the mode-selective condition. In addition, beam misalignment can also break the limitation of mode-selective condition and make the instability problem more complex.


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