Author_Institution :
Extreme Energy-Density Res. Inst., Nagaoka Univ. of Technol., Nagaoka, Japan
Abstract :
High power sub-terahertz pulsed gyrotrons are being developed for Collective Thomson Scattering (CTS) diagnostics of fusion plasmas. The typical target parameters are: output power 100~200 kW, operation frequency of 300 GHz, and pulsed length > 10 us. In order to support experimental development, numerical simulations have been carried out by using three dimensional particle-in-cell (PIC) code, "MAGIC". The oscillation modes of the electromagnetic radiation was selected as TE15,2 and TE17,2, for which the beam parameters and cavity dimensions was determined accordingly. So far, in the TE15,2 mode, the simulation results showed maximum power of ~ 156 kW at oscillation frequency of 295.10 GHz, with oscillation efficiency of ~ 24.04 %. Also, in the TE17,2 mode, the simulation results have showed maximum power of ~ 223 kW at oscillation frequency of 295.16 GHz, with conversion efficiency of ~ 34.42 %.
Keywords :
electromagnetic wave scattering; gyrotrons; CTS diagnostics; MAGIC; beam parameters; cavity dimensions; collective Thomson scattering diagnostics; efficiency 24.04 percent; efficiency 34.42 percent; electromagnetic radiation oscillation modes; frequency 295.10 GHz; frequency 295.16 GHz; frequency 300 GHz; fusion plasmas; power 100 kW to 200 kW; power 223 kW; subterahertz high-power gyrotron; three dimensional PIC code; three dimensional particle-in-cell code; three-dimensional particle-in-cell simulation; MAGIC; collective Thomson scattering; gyrotron; high-frequency; simulation; sub-terahertz;
