发表机构
Joint Institute for High Temperatures of the Russian Academy of Sciences（俄罗斯科学院高温联合研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过分子动力学模拟，研究了均匀磁场中超冷钙等离子体的膨胀，发现磁场导致电荷分离和电子逃逸，形成准中性核心与厚离子壳层，并观察到离子动能各向异性，结果与实验一致。
AI 中文摘要
我们展示了在恒定、均匀磁场中超冷 $^{40}$Ca 等离子体的分子动力学模拟结果。磁场引起了显著的空间电荷分离。此外，与向真空膨胀的情况相反，相当大比例的电子从离子所限定的区域逃逸。这导致形成一个准中性等离子体核心，其中包含剩余的电子，并被一个外部厚离子壳层包围，离子密度在壳层处急剧下降。还观察到离子动能的各向异性，这取决于离子运动方向相对于磁场线的方向。模拟结果与离子动力学的实验数据一致。
英文摘要
We present molecular dynamics simulation results for an ultracold $^{40}$Ca plasma in a constant, homogeneous magnetic field. The magnetic field induces a significant spatial separation of charges. Furthermore, a significant fraction of the electrons escapes from the region bounded by the ions, in contrast to the case of plasma expansion into a vacuum. This leads to the formation of a quasineutral plasma core containing the remaining electrons and surrounded by an outer, thick ion shell, where the ion density drops sharply. Anisotropy in the ion kinetic energy is also observed, depending on the direction of ion motion relative to the magnetic field lines. The simulation results are in agreement with experimental data on ion dynamics.
Comments6 pages, 10 figures
