A four-channel collective scattering system (CSS) has been developed to extend the current turbulence measurement capability (poloidal wavenumber 3 cm⁻¹) beyond the ion gyroscale in the KSTAR tokamak. By utilizing a 300 GHz probe beam and four-channel detector array, the CSS can measure electron density fluctuations of four distinct poloidal wavenumbers from 14 to 26 cm⁻¹ at a high sampling rate (typically 10 MS s⁻¹). In between discharges the radial measurement location can be varied from the plasma center to the outer edge with the remote control of the optical system. In this paper, the details of the major components and laboratory evaluation of the optical system are described. Several initial measurements such as (1) the broadband turbulence reduction during L–H transition, (2) the broadband turbulence increase in H-mode when the amplitude of edge-localized mode crashes is reduced by increased density, (3) the amplification of a quasi-coherent mode by additional heating in high-performance H-mode, and (4) the appearance of high-frequency magnetohydro-dynamical modes during slow L–H transition, are briefly presented. The possibility of the CSS as a hybrid system (of a scattering system and fluctuation interferometer), which complicates the interpretation of the CSS data, is also discussed.

已经开发了四通道集体散射系统（CSS），以将当前湍流测量能力（极化波数3 cm ^-1）扩展到KSTAR托卡马克中的离子陀螺仪之外。通过利用300 GHz探测光束和四通道检测器阵列，CSS可以以高采样率（通常为10 MS s ^-1）测量从14到26 cm ^-1的四个不同的极谱波数的电子密度波动。）。在两次放电之间，可通过光学系统的远程控制，从等离子体中心到外边缘改变径向测量位置。在本文中，将详细介绍光学系统的主要组件和实验室评估。几种初始测量，例如（1）L–H过渡期间宽带湍流减小，（2）当边缘局部模式崩溃的幅度因密度增加而减小时，H模式下宽带湍流增加，（3）放大简要介绍了在高性能H模式下通过附加加热产生的准相干模式，以及（4）在慢L–H过渡过程中高频磁流体动力学模式的出现。CSS作为混合系统（散射系统和波动干涉仪）的可能性，