光学层析成像诊断研究气体动力学阱中性等离子体成分
Optical tomography diagnostic for study of neutral plasma component in the gas dynamic trap
摘要：
最近，在气体动力阱上安装了光学诊断观测装置，用于观测等离子体吸收体附近边界区多个弦上的D-α线发射。实施模式的观察线是适合于局部发射率分布的断层重建，虽然必须采取的步骤，增加通道计数和角等离子体覆盖范围的扩展。模块化设计的光学配准系统使用带宽带放大器的雪崩光电二极管，可实现大信号动态范围和1 mks的有效时间分辨率。基于极大似然原理的迭代后向投影技术具有较高的计算精度。获得了等离子体在截面上的演化图像。还开发了相关分析工具，并提出了等离子体湍流研究的第一个结果。
英文摘要：
The optical diagnostic observing D-alpha line emission along multiple chords in the boundary region close to the plasma absorber, is recently installed at the gas dynamic trap. The implemented pattern of viewing lines is suitable for a tomographic reconstruction of local emissivity profiles, although steps towards increasing the channel count and extending of angular plasma coverage must be taken. The optical registration system of a modular design uses avalanche photodiodes with wideband amplifiers for a large signal dynamic range and the effective time resolution of 1 mks. The iterative backward projection technique based on the maximum likelihood principle, demonstrates an acceptable computation accuracy. Images of plasma evolution in the cross section were obtained. Tools for the correlation analysis were also developed and first results of study of the plasma turbulence are presented.
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