The first results of studies of quasi-coherent fluctuations (QCFs) in the spherical Globus-M tokamak are presented. QCFs were observed as oscillations of the Doppler backscattering (DBS) amplitude. These oscillations were not detected in the spectra of the complex signal of the quadrature detector, the shift of which determines the plasma rotation velocity. The multi-frequency DBS scheme allowed us to determine the region of existence of the QCFs (ρ = 0.6–0.7). Bicoherence analysis of the backscattered power demonstrates a nonlinear interaction between broadband turbulence and QCFs. The detected QC fluctuations were interpreted as relatively long-wave oscillations that influence the backscattering on shorter-wave oscillations.

介绍了球形 Globus-M 托卡马克中准相干涨落 (QCF) 的初步研究结果。观察到 QCF 作为多普勒反向散射 (DBS) 幅度的振荡。在正交检测器的复信号光谱中没有检测到这些振荡，正交检测器的偏移决定了等离子体的旋转速度。多频 DBS 方案使我们能够确定 QCF 的存在区域（ρ = 0.6-0.7）。反向散射功率的双相干分析表明宽带湍流和 QCF 之间存在非线性相互作用。检测到的 QC 波动被解释为相对长波振荡，它影响短波振荡的反向散射。