Two neutral-beam based diagnostic techniques are numerically evaluated for the stellarator TJ-II. The evaluation considers the beam from a dedicated diagnostic neutral beam injector that provides a 5 ms pulse of hydrogen accelerated to 30 keV as well as the light throughput of a dual purpose optical system that views the beam as it traverses the microwave, or neutral beam, heated plasmas of this magnetic confinement device. In the first instance, in which the implementation of the beam emission spectroscopy technique is considered for characterizing medium to long wavelength plasma turbulence, detailed estimates are made to determine the Balmer Hα light intensity reaching avalanche photodiode modules. In the second instance, similar detailed estimates are made for the spectrograph-based experimental set-up used for the Motional Stark Emission technique that has been successfully employed to determine the magnitude and direction of the internal magnetic field in TJ-II plasmas. In addition, optical measurements made to evaluate beam energy and composition are described. Finally, estimates and measurements are compared and discussed in order to complete this work.

中文翻译：

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仿星仪 TJ-II 中基于中性光束光谱诊断的数值考虑

对仿星器 TJ-II 的两种基于中性光束的诊断技术进行了数值评估。该评估考虑了来自专用诊断中性光束注入器的光束，该光束可提供 5 ms 加速至 30 keV 的氢脉冲，以及在光束穿过微波或中性光束时观察光束的双用途光学系统的光通量，该磁约束装置的加热等离子体。在第一种情况下，考虑实施光束发射光谱技术来表征中长波长等离子体湍流，进行详细估计以确定到达雪崩光电二极管模块的 Balmer Hα 光强度。在第二种情况下，对用于动态斯塔克发射技术的基于光谱仪的实验装置进行了类似的详细估计，该技术已成功用于确定 TJ-II 等离子体中内部磁场的大小和方向。此外，还描述了为评估光束能量和成分而进行的光学测量。最后，比较和讨论估计和测量以完成这项工作。