An Improved Design for High-power Coaxial-cavity Gyrotron with Misaligned Insert

The misalignment of insert would cause frequency shift, decrease in interaction efficiency and uneven ohmic loss distribution on the cavity walls which would affect the long pulse of gyrotron. The structure of gyrotron cavity has been optimized in our recent study to reduce the effect of misaligned insert. As the misaligned distance increases, the effects become larger. In this paper, the dependence of output characters on guiding center radius is investigated and an optimal guiding center radius is chosen to reduce the effect of misaligned insert.