Methods for extremely sparse-angle proton tomography.
Methods for extremely sparse-angle proton tomography.
复制标题
极稀疏角质子断层扫描方法。
DOI：
10.1103/physreve.104.045201
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Spiers BT
中科院分区：
文献类型：
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作者：
Spiers BT
质子放射成像是一种广泛应用于测量等离子体磁性结构的诊断技术。利用多mev动能质子在磁场作用下的偏转来推断其路径积分场强。在这里，首次提出使用层析成像方法来消除这些路径集成测量中固有的简并性，从而允许在三维空间上完全重建空间分辨磁场结构。本文提出了两种改进层析成像重建算法的技术，在探测光束数量严重有限的情况下，如在激光等离子体相互作用实验中，探测是由短的、高功率的激光脉冲照射二次箔目标产生的。一种新的配置允许生产更多的质子束从一个单一的短激光脉冲也提出了和这些分析的进步串联使用。
Proton radiography is a widely fielded diagnostic used to measure magnetic structures in plasma. The deflection of protons with multi-MeV kinetic energy by the magnetic fields is used to infer their path-integrated field strength. Here the use of tomographic methods is proposed for the first time to lift the degeneracy inherent in these path-integrated measurements, allowing full reconstruction of spatially resolved magnetic field structures in three dimensions. Two techniques are proposed which improve the performance of tomographic reconstruction algorithms in cases with severely limited numbers of available probe beams, as is the case in laser-plasma interaction experiments where the probes are created by short, high-power laser pulse irradiation of secondary foil targets. A new configuration allowing production of more proton beams from a single short laser pulse is also presented and proposed for use in tandem with these analytical advancements.