Design of the quasi-optical mode converter for the 140-GHz Gyrotron

In this paper the quasi-optical mode converter consisting a easily Vlasov launcher, one parabolic mirror and two phase correcting mirrors for the 140-GHz TE
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Gyrotron has been presented. A computer code for vector analysis of the electromagnetic fields in mirror systems has been developed in terms of the vector diffraction theory. Based on Stratton-Chu formula and the Katsenelenbaum-Semenov Algorithm (KSA), the structure of the two adapted phase correcting mirrors have been obtained. Using commercial software, the simulation results show that the power transmission efficiency from the Vlasov launcher to the vacuum widow is 90.51% and the fundamental Gaussian mode content is 96.52%.