聚变等离子体中尘埃杂质的带电和运动特性及温度变化研究

研究了在磁约束聚变环境中不同等离子体参数下尘埃粒子的带电、运动及温度特性.研究表明:电子温度与离子温度比对尘埃带电量有明显的影响;二次电子发射会显著减少尘埃带电量;尘埃充电的弛豫时间比在实验室加工等离子中要短得多.在考虑离子拖曳力作用下,尘埃粒子的速度可达102m·s-1的量级;针对碳材料计算得到粒子的寿命达毫秒量级.这些数值研究结果与实验观测结果相一致.

Characteristics of charging, motion and temperature of dust particulates in magnetic fusion devices

Characteristics of dust particulates (charging, movement and temperature) in magnetic fusion devices with different plasma parameters are discussed. It is shown that the charge quantity of dust particulates is obviously influenced by the ratio between electron and ion temperatures; secondary electron emission reduces the charge quantity; the charging relaxation time of dust particulates in fusion plasma is much shorter than in laboratory plasma; dust particulates speed reach hundreds of meters per second under the action of ion drag force; the lifetime of carbon dust in fusion plasma is on the millisecond scale. The results are consistent with experimental observations.