Pablant N A, Cheng Z, O'Mullane M, Gao L, Barnsley R, Bartlett M N, Bitter M, Bourcart E, Brown G V, De Bock M, Delgado-Aparicio L F, Dunn C, Fairchild A J, Hell N, Hill K W, Klabacha J, Kraus F, Lu D, Magesh P B, Mishra S, Sánchez Del Río M, Tieulent R, Yakusevich Y
Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton, New Jersey 08543, USA.
ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France.
Rev Sci Instrum. 2024 Aug 1;95(8). doi: 10.1063/5.0219328.
A high-fidelity synthetic diagnostic has been developed for the ITER core x-ray crystal spectrometer diagnostic based on x-ray ray tracing. This synthetic diagnostic has been used to model expected performance of the diagnostic, to aid in diagnostic design, and to develop engineering tolerances. The synthetic model is based on x-ray ray tracing using the recently developed xicsrt ray tracing code and includes a fully three-dimensional representation of the diagnostic based on the computer aided design. The modeled components are: plasma geometry and emission profiles, highly oriented pyrolytic graphite pre-reflectors, spherically bent crystals, and pixelated x-ray detectors. Plasma emission profiles have been calculated for Xe44+, Xe47+, and Xe51+, based on an ITER operational scenario available through the Integrated Modelling & Analysis Suite database, and modeled within the ray tracing code as a volumetric x-ray source; the shape of the plasma source is determined by equilibrium geometry and an appropriate wavelength distribution to match the expected ion temperature profile. All individual components of the x-ray optical system have been modeled with high-fidelity producing a synthetic detector image that is expected to closely match what will be seen in the final as-built system. Particular care is taken to maintain preservation of photon statistics throughout the ray tracing allowing for quantitative estimates of diagnostic performance.
基于X射线追踪技术，为国际热核聚变实验堆（ITER）的核心X射线晶体光谱仪诊断系统开发了一种高保真合成诊断方法。该合成诊断方法已用于对诊断系统的预期性能进行建模，辅助诊断设计，并确定工程公差。合成模型基于使用最近开发的xicsrt射线追踪代码进行的X射线追踪，并且包括基于计算机辅助设计的诊断系统的全三维表示。所建模的组件包括：等离子体几何形状和发射轮廓、高度定向热解石墨预反射器、球形弯曲晶体和像素化X射线探测器。基于通过集成建模与分析套件数据库获得的ITER运行场景，计算了Xe44+、Xe47+和Xe51+的等离子体发射轮廓，并在射线追踪代码中作为体积X射线源进行建模；等离子体源的形状由平衡几何形状和与预期离子温度轮廓相匹配的适当波长分布确定。X射线光学系统的所有单个组件都已进行高保真建模，生成的合成探测器图像预计将与最终建成系统中看到的图像非常接近。在整个射线追踪过程中特别注意保持光子统计信息，以便对诊断性能进行定量估计。
