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High-efficiency fast scintillators for 'optical' soft x-ray arrays for laboratory plasma diagnostics

机译：用于实验室等离子体诊断的“光学”软X射线阵列的高效快速闪烁器

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Scintillator-based "optical" soft x-ray (OSXR) arrays have been investigated as a replacement for theconventional silicon (Si)-based diode arrays used for imaging, tomographic reconstruction, magnetohy-drodynamics, transport, and turbulence studies in magnetically confined fusion plasma research. An experimental survey among several scintillator candidates was performed, measuring the relative and absolute conversion efficiencies of soft x rays to visible light. Further investigations took into account glass and fiber-optic faceplates (FOPs) as substrates, and a thin aluminum foil (150 nm) to reflect the visible light emitted by the scintillator back to the optical detector. Columnar (crystal growth) thallium-doped cesium iodide (CsI:Tl) deposited on an FOP, was found to be the best candidate for the previously mentioned plasma diagnostics. Its luminescence decay time of the order of approx1-10 (mu)s is thus suitable for the 10 (mu)s time resolution required for the development of scintillator-based SXR plasma diagnostics. A prototype eight channel OSXR array using CsI:Tl was designed, built, and compared to an absolute extreme ultraviolet diode counterpart: its operation on the National Spherical Torus Experiment showed a lower level of induced noise relative to the Si-based diode arrays, especially during neutral beam injection heated plasma discharges. The OSXR concept can also be implemented in less harsh environments for basic spectroscopic laboratory plasma diagnostics.
机译：已经研究了基于闪烁体的“光学”软X射线（OSXR）阵列，以替代常规的基于硅（Si）的二极管阵列，该阵列用于成像，断层成像重建，磁流体动力学，输运和湍流研究中的磁约束聚变等离子研究。在几个候选闪烁体之间进行了实验调查，测量了软X射线到可见光的相对和绝对转换效率。进一步的研究考虑了以玻璃和光纤面板（FOP）为基材，以及薄铝箔（150 nm），以将闪烁体发出的可见光反射回光学检测器。发现沉积在FOP上的柱状（晶体生长）th掺杂碘化铯（CsI：Tl）是上述血浆诊断的最佳候选者。因此，其发光衰减时间约为1-10μs的量级，适合开发基于闪烁器的SXR等离子体诊断程序所需的10μs的时间分辨率。设计，构建了使用CsI：Tl的原型八通道OSXR阵列，并将其与绝对的极端紫外线二极管对应物进行了比较：与国家硅球形二极管阵列相比，其在国家球形圆环实验中的运行显示出较低的感应噪声水平，尤其是在中性束注入过程中，加热的等离子体放电。 OSXR概念还可以在不太苛刻的环境中实施，以进行基本的光谱实验室等离子体诊断。

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