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Diagnostic development for ST plasmas on NSTX

机译：NSTX上ST血浆的诊断开发

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Spherical tori (ST) have much lower aspect ratio (a/R) and lower toroidal magnetic field than conventional tokamaks and stellarators. This paper will highlight some of the challenges and opportunities these features pose in the diagnosis of ST plasmas in the National Spherical Tor-us Experiment (NSTX), and discuss some of the corresponding diagnostic development that is underway. The low aspect ratio necessitates a small centre stack, with tight space constraints and large thermal excursions, complicating the design of magnetic sensors in this region. The toroidal magnetic field on the NSTX is less than or equal to0.6 T, making it impossible to use ECE as a good monitor of electron temperature. A promising new development for diagnosing electron temperature is electron Bernstein wave radiometry, which is currently being pursued on the NSTX. A high-resolution charge exchange recombination spectroscopy system is being installed. Since non-inductive current initiation and sustainment are top-level NSTX research goals, measurements of the current profile J(R) are essential to many planned experiments. On the NSTX several modifications are planned to adapt the motional Stark effect (MSE) technique to lower field, and two novel MSE systems are being prototyped. Several high-speed two-dimensional imaging techniques are being developed for viewing both visible and x-ray emission. The toroidal field is equivalent to the poloidal field at the outside plasma edge, producing a large field pitch (>50degrees) at the outer midplane. The large shear in pitch angle makes some fluctuation diagnostics like beam emission spectroscopy very difficult, while providing a means of achieving spatial localization for microwave scattering investigations of high-k turbulence, which are predicted to be virulent for NSTX plasmas. A brief description of several of these techniques will be given in the context of the current NSTX diagnostic set. [References: 32]
机译：球形托里（ST）的纵横比（a / R）低得多，环形磁场也比传统托卡马克和恒星器低。本文将重点介绍这些功能在国家球形眼睑试验（NSTX）诊断ST血浆中所带来的挑战和机遇，并讨论正在进行的某些相应诊断开发。低的长宽比需要较小的中心堆栈，并具有严格的空间限制和较大的热偏移，这使该区域的磁传感器设计变得复杂。 NSTX上的环形磁场小于或等于0.6 T，因此不可能将ECE用作电子温度的良好监测器。诊断电子温度的有希望的新进展是电子伯恩斯坦波辐射测定法，目前正在NSTX上进行。正在安装高分辨率电荷交换复合光谱系统。由于非感应电流的产生和维持是NSTX的顶级研究目标，因此电流分布J（R）的测量对于许多计划的实验都是必不可少的。在NSTX上，已计划进行几种修改，以使运动Stark效应（MSE）技术适应较低的领域，并且正在对两个新颖的MSE系统进行原型设计。正在开发几种高速二维成像技术以查看可见光和X射线发射。环形场等效于外部等离子体边缘处的极场，在外部中平面处产生较大的场距（> 50度）。俯仰角的大剪切力使某些波动诊断（如束发射光谱）非常困难，同时为实现高k湍流的微波散射研究提供了一种实现空间定位的手段，而高k湍流被认为对NSTX等离子体具有毒性。在当前的NSTX诊断集的背景下，将简要介绍其中的几种技术。 [参考：32]

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