Bayesian Combined Analysis of JET LIDAR, Edge LIDAR and Interferometry Diagnostics
Bayesian Combined Analysis of JET LIDAR, Edge LIDAR and Interferometry Diagnostics
复制标题
JET LIDAR、Edge LIDAR 和干涉测量诊断的贝叶斯组合分析
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Contributors
中科院分区：
文献类型：
--
作者：
O. Ford;J. Svensson;M. Beurskens;A. Boboc;J. Flanagan;M. Kempenaars;D. McDonald;A. Meakins;J. Contributors
简介 电子密度 ne 和温度 Te 的精确测定对于托卡马克研究的许多领域都很重要。在 JET 上，一些诊断会进行观察，通常会独立分析这些观察以推断 ne 和 Te。由于位置、空间分辨率和诊断物理过程的不同以及不同分析的假设和准确性，将这些结果结合起来以获得 Te 和 ne 的单一完整图像变得复杂。本文使用贝叶斯分析和正演建模，从干涉测量 [1]、核心 LIDAR [2] 和边缘 LIDAR [3] 诊断的观察以及一组先验假设中获得关于 Ne 和 Te 的已知信息的单一一致图像。干涉测量法沿极面平面内的 8 条视线精确测量线积分密度。两个激光雷达系统测量约 300ps 激光脉冲的汤姆逊背向散射光光谱。核心 LIDAR 激光大致穿过磁性中平面，边缘 LIDAR 与通量表面相切，从而对等离子体边缘进行高分辨率观测。视线如图1a所示。
Introduction The accurate determination of electron density ne and temperature Te is important for many areas of Tokamak research. On JET, several diagnostics make observations which are usually analysed independently to infer ne and Te. Combining such results to obtain a single complete picture of Te and ne is complicated by the varying location, spatial resolution and physical processes of the diagnostics and by the assumptions and accuracies of the different analyses. Bayesian analysis and forward modelling are used in this paper to obtain a single consistent picture of what can be known about Ne and Te from the observations of the Interferometry[1], core LIDAR[2] and edge LIDAR[3] diagnostics and a single set of prior assumptions. The interferometry measures accurate line-integrated density along 8 line of sights in the poloidal plane. Two LIDAR systems measure the spectrum of Thomson back-scattered light, from a ∼ 300ps laser pulse. The core LIDAR laser passes approximately through the magnetic midplane and the edge LIDAR passes tangential to the flux surfaces, giving high resolution observations of the plasma edge. The lines of sight are shown in figure 1a.