The imaging neutral particle analyzer (INPA) is a scintillator-based diagnostic that provides energy and radially resolved measurements of confined fast ions. To verify operation, understanding, and modeling of the diagnostic performance, distributions of deuterium beam ions in low density, nearly MHD-quiescent plasmas are measured on the DIII-D tokamak using the INPA. The distribution is altered by changing the pitch-angle scattering rate with electron cyclotron heating (ECH). Experimental images are mostly reproduced with simulation of core fast ions charge exchanging with injected beam and edge cold neutrals in classical cases. Image comparisons between the experiment and simulation show agreement with less than 25% discrepancies near the beam injection energy of 50 keV. Other strong passive signals, observed in a localized region on the image, are suggested to come from charge exchange between cold neutrals and fast ions around the plasma boundary.

中文翻译：

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在 DIII-D 上使用注入束离子在近 MHD 静态等离子体中验证成像中性粒子分析仪

成像中性粒子分析仪 (INPA) 是一种基于闪烁体的诊断，可提供能量和受限快离子的径向分辨测量值。为了验证诊断性能的操作、理解和建模，使用 INPA 在 DIII-D 托卡马克上测量低密度、近 MHD 静态等离子体中的氘束离子分布。通过电子回旋加热 (ECH) 改变俯仰角散射率来改变分布。实验图像主要是通过模拟经典情况下的注入束和边缘冷中性粒子的核心快离子电荷交换来再现的。实验和模拟之间的图像比较表明，在 50 keV 的射束注入能量附近，差异小于 25%。在图像的局部区域观察到的其他强被动信号，