This study analyzes the dependences of the size of the luminous region of hydrocarbon pellet cloud on the ablation rate, as well as on the ambient plasma electron density and temperature. The data were obtained in a series of experiments where spherical solid polystyrene pellets with a diameter of ≈900 μm at a speed of ≈450 m s⁻¹ were injected into hydrogen plasma of the large helical device. The ambient plasma with an electron temperature of 0.5–1.5 keV and a density of (1–7) 10¹⁹ m⁻³ was maintained by injection of neutral atom beams with total the heating power of 3–14 MW. A scaling law was derived for determining the transverse size of the cloud’s luminous region from the known values of the pellet’s current radius as well as the values of the density and temperature of the ambient plasma at the place of image acquisition. The interdependencies between various dimensions of the luminous region obtained in the line spectrum are established. The presence of such dependences makes it possible to describe the dimensions of the luminous region comprehensively by means of the scaling law for its transverse size.

本研究分析了碳氢化合物颗粒云发光区域大小对烧蚀速率以及周围等离子体电子密度和温度的依赖性。这些数据是在一系列实验中获得的，其中直径 ≈900 μm 的球形固体聚苯乙烯颗粒以≈450 ms ^-1的速度注入到大型螺旋装置的氢等离子体中。电子温度为 0.5-1.5 keV 且密度为 (1-7) 10 ¹⁹ m ^-3的环境等离子体通过注入总加热功率为 3-14 MW 的中性原子束来维持。根据颗粒当前半径的已知值以及图像采集位置周围等离子体的密度和温度值，推导出用于确定云发光区域横向尺寸的比例定律。建立了在线光谱中获得的发光区域的各个维度之间的相互依赖性。这种相关性的存在使得可以通过其横向尺寸的标度定律来全面描述发光区域的尺寸。