Development of high power sub-THz gyrotron for collective scattering measurement in nuclear fusion plasma

我们研制了工作在0.4THz左右的太赫兹光源，用于集体散射测量。考虑到电子枪的特性、非线性效应和模式竞争等因素，对工作模式和腔型进行了仔细的选择，成功地获得了0.35THz的52kW和0.4THz的37kW的辐射。此外，由于工作模式的改变和电子束质量的提高，利用TE18模式实现了0.4THz62kW的辐射。

We developed THz source operating at around 0.4THz for application of collective scattering measurement. As results of careful selection of operating mode and cavity shape under the consideration of characteristics of electron gun, nonlinear effect and mode competition, 52 kW radiation at 0.35THz and 37kW radiation at 0.4THz were successfully achieved. Moreover, 62kW radiation at 0.4THz using TE18 mode was realized due to change of operating mode and improvement of electron beam quality.