Mirror synthesis for gyrotron quasi-optical mode converters

A new approach for the design of a quasi-optical gyrotron mode converter is proposed. It is based on the synthesis of quasi-optical mirrors using diffraction (Helmholtz-Kirchhoff) integrals. First application of such a method was already described. Now a more powerful technic is used to provide optimal distributions of the wave beam field. It is shown that by means of specially shaped mirrors, parameters of the main converter are enhanced strongly. In this paper the authors review the search for the optimal scheme of the converter, present and compare results of calculations and measurements of the gyrotron wave beam