通过成像测量高温微粒加速度
Measurement of high-temperature microparticle acceleration through imaging
摘要：
尺寸从亚微米到毫米的微粒是磁聚变环境中常见的物质形式，并且由于它们的质量小，它们具有高度的移动性。除了重力之外，不同的力也会影响等离子体内外的运动。最近的几项进展开辟了新的诊断可能性，以表征粒子运动及其力量：高速成像相机技术，为融合开发的微粒注射技术，和图像处理软件。扩展我们早期的工作高温四维微粒跟踪使用爆炸线，我们报告的时间分辨微粒加速度测量的最新结果。新的粒子跟踪算法被发现是有效的粒子跟踪，即使有大量的粒子彼此接近。对极线约束用于双摄像机视图的轨迹配对。基于大量的二维航迹数据和三维航迹重建，对基于外几何模型的误差场进行了表征。获得基于各个重建的3D轨迹的加速度。力的灵敏度达到了10倍重力加速度的量级。高速成像是一种有用的诊断工具，用于微粒子物理、计算机模型验证和磁聚变质量注入技术的发展。
英文摘要：
Microparticles ranging from sub-microns to millimeter in size are a common form of matter in magnetic fusion environment, and they are highly mobile due to their small mass. Different forces in addition to gravity can affect their motion both inside and outside the plasmas. Several recent advances open up new diagnostic possibilities to characterize the particle motion and their forces: high-speed imaging camera technology, microparticle injection techniques developed for fusion, and image processing software. Extending our earlier work on high-temperature 4D microparticle tracking using exploding wires, we report latest results on time-resolved microparticle acceleration measurement. New particle tracking algorithm is found to be effective in particle tracking even when there are a large number of particles close to each other. Epipolar constraint is used for track-pairing from two-camera views. Error field based on epi-geometry model is characterized based on a large set of 2D track data and 3D track reconstructions. Accelerations based on individual reconstructed 3D tracks are obtained. Force sensitivity on the order of ten gravitational acceleration has achieved. High-speed imaging is a useful diagnostic tool for microparticle physics, computer model validation and mass injection technology development for magnetic fusion.
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