论文标题
诊断具有斜质子射线照相的圆柱体内爆的磁场
Diagnosing Magnetic Fields in Cylindrical Implosions with Oblique Proton Radiography
论文作者
论文摘要
欧米茄激光系统上的两个实验使用斜质子X线照相术，测量带有和没有施加轴向磁场的圆柱体内爆的磁场。尽管这两个实验的目的都是测量爆内爆的核心中压缩轴向磁场的大小，但该场被压缩光束产生的冠状等离子体中的两个特征掩盖：方位角自我生成的磁场和小长度尺度，高振幅结构，高振幅结构，归因于无碰撞的无碰撞影响。为了理解这些特征，使用3-D Hydra模拟产生的字段生成合成X光片。这些合成X光片重现了实验X光片的特征，除了小规模的结构。直接的反转算法成功地应用于合成X光片，但仅部分能够倒入实验X光片，部分原因是某些质子被现场线圈阻塞。探索了X光片特征的起源及其对各种实验参数的依赖。该分析的结果应为圆柱体内爆的压缩轴向磁场的未来测量。
Two experiments on the OMEGA Laser System used oblique proton radiography to measure magnetic fields in cylindrical implosions with and without an applied axial magnetic field. Although the goal of both experiments was to measure the magnitude of the compressed axial magnetic field in the core of the implosion, this field was obfuscated by two features in the coronal plasma produced by the compression beams: an azimuthal self-generated magnetic field and small length scale, high-amplitude structures attributed to collisionless effects. In order to understand these features, synthetic radiographs are generated using fields produced by 3-D HYDRA simulations. These synthetic radiographs reproduce the features of the experimental radiographs with the exception of the small-scale structures. A direct inversion algorithm is successfully applied to a synthetic radiograph, but is only partially able to invert the experimental radiographs in part because some protons are blocked by the field coils. The origins of the radiograph features and their dependence on various experimental parameters are explored. The results of this analysis should inform future measurements of compressed axial magnetic fields in cylindrical implosions.
