Shi Peiyun, Srivastav Prabhakar, Beatty Cuyler, Nirwan Ripudaman Singh, Scime Earl E
Department of Physics and Astronomy, West Virginia University and Center for KINETIC Plasma Physics, Morgantown, West Virginia 26506, USA.
Rev Sci Instrum. 2021 Mar 1;92(3):033102. doi: 10.1063/5.0040606.
A new incoherent Thomson scattering system measures the evolution of electron velocity distribution functions perpendicular and parallel to the ambient magnetic field during kinking of a single flux rope and merging of two flux ropes through magnetic reconnection. The Thomson scattering system provides sub-millimeter spatial resolution, sufficient to diagnose the several millimeters sized magnetic reconnection electron diffusion region in the PHAse Space MAppgin experiment. Due to the relatively modest plasma density ∼10 m and electron temperature ∼1 eV, stray light suppression is critical for these measurements. Two volume Bragg gratings are used in series as a notch filter with a spectral bandwidth <0.1 nm in the collection branch. A CCD with a Gen III intensifier with peak quantum efficiency >47% is used as the detector in a 1.3 m spectrometer. Preliminary results of gun plasma electron temperature will be reported and compared with measurements obtained from a triple Langmuir probe.
一种新型的非相干汤姆逊散射系统，用于测量在单个磁通绳扭结以及通过磁重联使两个磁通绳合并过程中，电子速度分布函数在垂直和平行于背景磁场方向上的演化。该汤姆逊散射系统提供亚毫米级的空间分辨率，足以在相空间映射实验中诊断尺寸为几毫米的磁重联电子扩散区。由于等离子体密度相对适中（约为10^19 m^-3）且电子温度约为1 eV，杂散光抑制对于这些测量至关重要。在收集支路中，两个体布拉格光栅串联用作带通滤波器，其光谱带宽<0.1 nm。在一台1.3米光谱仪中，使用带有峰值量子效率>47%的第三代增强器的电荷耦合器件（CCD）作为探测器。将报告枪式等离子体电子温度的初步结果，并与通过三探针朗缪尔探针获得的测量结果进行比较。
