Sung C, Rhodes T L, Peebles W A
Department of Physics and Astronomy, University of California, Los Angeles, California 90098, USA.
Rev Sci Instrum. 2018 Oct;89(10):10H106. doi: 10.1063/1.5036520.
In this paper, we address the challenging question of measuring turbulence levels on the high magnetic field side (HFS) of tokamak plasmas. Although turbulence measurements on the HFS can provide a stringent constraint for the turbulence model validation, to date only low magnetic field side (LFS) measured turbulence has been used in validation studies. To address this issue, an eight channel Correlation Electron Cyclotron Emission (CECE) system at DIII-D was modified to probe both LFS and HFS. In contrast to the second harmonic extraordinary mode electron cyclotron resonance emission that is typically used in CECE, we show that it is possible to probe the HFS using fundamental O-mode electron cyclotron resonance emission. The required hardware modifications for the HFS measurements are presented here, and the potential issues in this measurement are discussed.
在本文中，我们探讨了测量托卡马克等离子体高磁场侧（HFS）湍流水平这一具有挑战性的问题。尽管在高磁场侧进行湍流测量可为湍流模型验证提供严格约束，但迄今为止，验证研究中仅使用了低磁场侧（LFS）测量的湍流。为解决此问题，DIII-D装置上的一个八通道相关电子回旋辐射（CECE）系统被改装，以同时探测低磁场侧和高磁场侧。与通常用于相关电子回旋辐射的二次谐波异常模电子回旋共振辐射不同，我们表明利用基模O模电子回旋共振辐射来探测高磁场侧是可行的。本文介绍了高磁场侧测量所需的硬件改装，并讨论了该测量中可能存在的问题。
