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

The results of the 1-mm wavelength orotron optimization operating on the first space harmonic of two row periodic structure (TRPS) are presented. The computer simulation methods of the electron - wave interaction efficiency investigation, which were developed for an orotron at long-wavelength range, are used. The spherocylinder was used as a focusing mirror. The cylinder longitudinal axis was parallel to the electron beam direction. The optimal TRPS length dependence vs. ohmic losses in open resonator for maximum orotron efficiency is found. The calculations were fulfilled on the bases of the results obtained in paper. It was shown that the quality of the surface treatment of TRPS plays 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 narrow - electron beam with current density only 60A/cm².