In the present work, we report the dynamics and geometrical features of the plasma plume formed by the laser ablation of copper and graphite (carbon) targets in the presence of different transverse magnetic field. This work emphasizes on the effect of atomic mass of the plume species on the diamagnetic behaviour and geometrical aspect of the expanding plasma plume in the magnetic field. The time-resolved analysis of the simultaneously captured two directional images in orthogonal to the expansion axis is carried out for the comparative study of projected three-dimensional structure of copper and carbon plasma plume. In the presence of magnetic field, sharp differences are observed between the copper and carbon plasma plumes in terms of formation of diamagnetic cavity and structure formation. An elliptical cavity-like structure is observed in case of copper plasma plume which attains the sharp conical shape with increasing the time delay or magnetic field strength. On the other hand, splitted carbon plasma plume appears as a Y-shape structure in the presence of magnetic field where the cavity-like structure is not observed for the considered time and magnetic field. Based on the modified energy balance relation for the elliptic cylindrical geometry, we have also simulated the dynamics of the plume which is in close agreement with observed plasma expansion in diamagnetic and non-diamagnetic regions.

在目前的工作中，我们报告了在存在不同横向磁场的情况下由铜和石墨（碳）目标的激光烧蚀形成的等离子体羽流的动力学和几何特征。这项工作强调羽流种类的原子质量对磁场中膨胀等离子体羽流的抗磁行为和几何方面的影响。对同时捕获的与扩展轴正交的两个方向图像进行时间分辨分析，以比较研究铜和碳等离子体羽流的投影三维结构。在磁场存在下，铜和碳等离子体羽流在抗磁腔的形成和结构形成方面存在明显差异。在铜等离子体羽流的情况下观察到椭圆腔状结构，随着时间延迟或磁场强度的增加，其获得尖锐的圆锥形状。另一方面，分裂的碳等离子体羽流在存在磁场的情况下表现为 Y 形结构，其中在所考虑的时间和磁场中未观察到空腔状结构。基于椭圆圆柱几何的修正能量平衡关系，我们还模拟了羽流的动力学，这与观察到的抗磁性和非抗磁性区域的等离子体膨胀非常一致。在存在磁场的情况下，分裂的碳等离子体羽流显示为 Y 形结构，其中在所考虑的时间和磁场中未观察到空腔状结构。基于椭圆圆柱几何的修正能量平衡关系，我们还模拟了羽流的动力学，这与观察到的抗磁性和非抗磁性区域的等离子体膨胀非常一致。在存在磁场的情况下，分裂的碳等离子体羽流显示为 Y 形结构，其中在所考虑的时间和磁场中未观察到空腔状结构。基于椭圆圆柱几何的修正能量平衡关系，我们还模拟了羽流的动力学，这与观察到的抗磁性和非抗磁性区域的等离子体膨胀非常一致。