Simultaneous excitation of fundamental and second harmonic in a quasi-optical gyrotron
A quasi-optical gyrotron (QOG) designed for operation at the fundamental (100 GHz) exhibits simultaneous emission at the fundamental and at the 2nd harmonic. The experimental measurements show that the 2nd harmonic can be excited only when the fundamental is present. Within 0.03% of deviation, the measured frequency of the 2nd harmonic is exactly twice that of the fundamental. Experimental evidence shows that when the 2nd harmonic is not excited, total efficiency is enhanced. In order to understand the nature of this unwanted emission and its effects on the efficiency of the quasi-optical gyrotron, a multimode code considering the competition between the fundamental and the 2nd harmonic, but not taking a.c. electrostatic self-fields into account, is used and results from the simulation are presented.
Bibliographic Reference: Paper presented: 32nd APS Annual Meeting, Division of Plasma Physics, Cincinnati (US), Nov. 12-16, 1990
Availability: Available from (1) as Paper EN 35635 ORA
Record Number: 199110821 / Last updated on: 1994-12-02
Original language: en
Available languages: en