High-frequency electromagnetic fluctuations and edge-coherent modes (ECMs) have been detected by Doppler reflectometry (DR) in the pedestal region of the Experimental Advanced Superconducting Tokamak. The frequency of the electromagnetic fluctuations was proportional to the Alfvén velocity and localized in the ellipticity-induced Alfvén eigenmodes (EAEs) gap in the Alfvén continuum. Therefore, the fluctuations are presumed to be EAE. The DR measurements of poloidal flow fluctuations show that EAEs and ECMs have amplitude envelopes that are localized near the bottom of the radial electric field well. Simultaneous EAE and ECM activity generates sidebands at fEAE±fECM , the strengths of the upper and lower sidebands are unequal, with the upper sideband being stronger. This is consistent with the theoretical prediction of Chen et al. Compared with ECM-only discharges, the inclusion of EAEs leads to an increase in Dα intensity, thus indicating enhanced outward particle transport.

中文翻译：

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实验性先进超导托卡马克的阿尔芬本征模与边缘相干模之间的耦合

多普勒反射计 (DR) 在实验先进超导托卡马克的基座区域检测到了高频电磁波动和边缘相干模式 (ECM)。电磁涨落的频率与阿尔文速度成正比，并且位于阿尔文连续体中椭圆率引起的阿尔文本征模 (EAE) 间隙中。因此，波动被推定为 EAE。极向流波动的 DR 测量表明，EAE 和 ECM 具有位于径向电场井底部附近的幅度包络。同时 EAE 和 ECM 活动产生边带 F乙A乙±F乙C中号 ，上下边带的强度不相等，上边带较强。这与陈的理论预测是一致的等人。与仅 ECM 放电相比，包含 EAE 会导致 Dα 强度，从而表明向外的颗粒传输增强。