Wang G, Rhodes T L, Howard N T, Peebles W A
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
MIT - Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
Rev Sci Instrum. 2024 Aug 1;95(8). doi: 10.1063/5.0219577.
To validate nonlinear gyrokinetic simulations of electron temperature turbulence, the experimental correlation electron cyclotron emission (CECE) measurements are to be compared using a synthetic CECE diagnostic, which generates modeled CECE measurement quantities by implementing realistic measurement parameters (e.g., spatial and wavenumber resolutions, radial location, etc.) to nonlinear gyrokinetic simulations. In this work, we calculate the radial and vertical spatial and wavenumber transfer functions, which are defined by the electron cyclotron emission emissivity radial profile and vertical probing antenna pattern, respectively. These transfer functions are applied to nonlinear gyrokinetic simulations of electron temperature turbulence using the continuum gyrokinetic code. A simultaneous comparison of the experimental electron temperature turbulence power spectrum and root-mean-square (RMS) level, as well as the radial correlation length with the new synthetic CECE diagnostic at a core location ρ ∼ 0.75 in an L-mode DIII-D tokamak plasma, is presented. The preliminary result shows that the synthetic CECE output underestimates the RMS level by ∼42% and overestimates the radial correlation length by ∼40%.
为了验证电子温度湍流的非线性回旋动理学模拟，将使用一种合成电子回旋辐射（CECE）诊断方法来比较实验相关的电子回旋辐射测量结果，该诊断方法通过将实际测量参数（例如空间和波数分辨率、径向位置等）应用于非线性回旋动理学模拟来生成模拟的CECE测量量。在这项工作中，我们计算了径向和垂直空间以及波数传递函数，它们分别由电子回旋辐射发射率径向分布和垂直探测天线方向图定义。这些传递函数被应用于使用连续回旋动理学代码进行的电子温度湍流的非线性回旋动理学模拟。给出了在L模DIII-D托卡马克等离子体中，在核心位置ρ ∼ 0.75处，实验电子温度湍流功率谱、均方根（RMS）水平以及径向相关长度与新的合成CECE诊断结果的同时比较。初步结果表明，合成CECE输出低估了RMS水平约42%，高估了径向相关长度约40%。
