The Institute of Applied Physics of the Russian Academy of Sciences has for many years been developing sub-terahertz and terahertz large-orbit gyrotrons that permit selective oscillation at higher cyclotron harmonics than is possible in the conventional gyrotrons. Currently, experimental studies are conducted at two specialized facilities. A prototype universal sub-terahertz source for magnetic resonance spectroscopy is studied using a facility that generates long-pulse and continuous electron beams with particle energies of up to 30 KeV. Continuous selective oscillation at the second and third cyclotron harmonics with frequencies of 0.267 and 0.394 THz was obtained for a radiation power of 900 and 370 W, respectively. New resonators with periodic phase correctors have been developed to increase the efficiency of third-harmonic oscillation and obtain fourth-harmonic oscillation with frequencies of up to 0.65 THz. Using a facility with an electron energy of up to 80 KeV, we study the possibilities of increasing the pulse generation power at the third harmonic at frequencies close to 1 THz to employ in experiments on obtaining a gas discharge in a focused terahertz wave beam and generating high-power extreme ultraviolet radiation.

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在 IAP RAS 具有环绕轴电子束的高谐波回旋加速器

俄罗斯科学院应用物理研究所多年来一直在开发亚太赫兹和太赫兹大轨道回旋加速器，它们允许在比传统回旋加速器更高的回旋谐波下进行选择性振荡。目前，实验研究在两个专门设施进行。使用可产生长脉冲和连续电子束且粒子能量高达 30 KeV 的设备研究了用于磁共振波谱的原型通用亚太赫兹源。对于 900 W 和 370 W 的辐射功率，分别获得了频率为 0.267 和 0.394 THz 的二次和三次回旋谐波的连续选择性振荡。已开发出具有周期性相位校正器的新型谐振器，以提高三次谐波振荡的效率并获得频率高达 0.65 THz 的四次谐波振荡。使用电子能量高达 80 KeV 的设备，我们研究了在频率接近 1 THz 的三次谐波处增加脉冲产生功率的可能性，以用于在聚焦太赫兹波束中获得气体放电并产生高功率极紫外辐射。