In-vessel viewing system prototype performance measurements and simulation of measurement quality across the ITER in-vessel components
In-vessel viewing system prototype performance measurements and simulation of measurement quality across the ITER in-vessel components
复制标题
容器内查看系统原型性能测量以及 ITER 容器内组件测量质量的模拟
DOI：
10.1016/j.fusengdes.2019.03.187
复制
发表时间：
2019
影响因子：
1.7
通讯作者：
R. Reichle
中科院分区：
文献类型：
--
作者：
T. Siegel;E. Kolokotronis;A. Cifuentes;P. Matía;Adrià Sansa;Parthena Symeonidou;P. Bates;C. Damiani;G. Dubus;A. Puiu;R. Reichle
容器内观察和计量系统（IVVS）是ITER机器操作的基本工具，其任务是检查容器内组件的等离子体表面（PFS）是否有损坏和腐蚀。IVVS设计已发展到包括混合观察和计量系统，使用调频（FM）激光雷达进行绝对距离测量，研制了一台全尺寸的激光雷达样机，在最佳方案下，其视距精度达到2 μm。误差分析表明，当入射角为0-70°时，在0.5 ~ 10 m的表面上可获得2 ~ 400 μm的三维精度，超过了ITER的要求。为了参数化反射率，测量了偏滤器整体原型的双向反射分布函数（BRDF），并建立了BRDF的解析模型。开发了IVVS模拟器，并用于分析血管内几何结构和预测PFS的覆盖范围。我们已经证明，如果IVVS满足高达65°入射角和8 m距离的性能要求，则可以覆盖PFS区域的85%。
The In-Vessel Viewing and Metrology System (IVVS) is a fundamental tool for the ITER machine operations, tasked with inspection of plasma facing surfaces (PFS) of in-vessel components for both damage and erosion.The IVVS design has evolved to include a hybrid viewing and metrology system, using Frequency Modulated (FM) lidar for absolute distance measurements, and amplitude modulated (AM) lidar for surface viewing A full-scale prototype has been built, and has produced line-of-sight range precision of <2 μm in the optimum scenario. Error analysis indicates that 3D precision from 2 to 400 μm should be available over surfaces from 0.5 to 10 m with 0–70° incidence angles, exceeding the ITER requirements.Performance was found to be highly sensitive to received power and surface reflectivity. To parameterize the reflectivity, the Bidirectional Reflectance Distribution Function (BRDF) of a divertor monoblock prototype was measured and an analytic BRDF model was developed. An IVVS simulator was developed and used both to analyse the in-vessel geometry and to predict the coverage of the PFS. We have shown that 85% of the PFS area can be covered if the IVVS meets performance requirements up to incidence angles of 65° and distances of 8 m.