The 1-MM wavelength orotron with TRPS on first space harmonic

Abstract

The results of the 1 mm wavelength orotron optimization operating on the first space harmonic of a two-row periodic structure (TRPS) are presented. The computer simulation methods of the electron-wave interaction efficiency investigation, which were developed for the orotron at long-wavelength range, are used. The multi-focus sphere-cylinder mirror was used as a focusing mirror. The cylinder longitudinal axis was perpendicular to the broad electron beam direction. The optimal TRPS length dependence on ohmic losses in the open resonator for maximum orotron efficiency is found. The calculations were fulfilled on the bases of the results obtained in paper [1, 3]. It was shown that the quality of the surface treatment of TRPS plays an important role. The higher is the surface quality the shorter is the length of space interaction where the maximum efficiency is achieved and the higher is its value and the value of output power, which can be ten of watts (and more) on the first space harmonic at the broad electron beam with current density of only 35A/cm2. The calculations were fulfilled for the transformation coefficient k of HF field of OR to the 1st space harmonic of TRPS at K=2/π and k = 0.2. The decrease of k = 0.2 leads up to TRPS length increase.