用激光散射法测量等离子体的电子温度和θ-收缩等离子体能量损失的研究

本文叙述了用红宝石激光的汤姆逊散射测量θ-收缩等离子体的电子温度。应用一维单流体模型分析了θ-线圈中心平面处电子温度随时间变化的规津。实验表明,电子温度比绝热压缩的理论值小得多,考虑了电子的热传导损失以后,实验与理论符合得比较好。根据一维单流体模型,计算了热导系数。它比Spitzer计算的经典值大两至三倍。约在3μs以后,电子温度迅速下降,热导理论不再适用。一种可能的解释是终端损失起主要作用,使等离子体迅速瓦解。 关键词：

THE MEASUREMENT OF ELECTRON TEMPERATURE OF PLASMA BY LASER SCATTERING AND THE ENERGY LOSS OF θ-PINCH PLASMA

In this paper, the measurement of electron temperature of the θ-pinch plasma by means of Thomson scattering of ruby laser is described. The experimental data of clectron temperature in θ-coil midplane are analysed using the one-fluid model. The experimental results show that the electron temperature is much less than the theoretical value in the ease of adiabatic compression, and the experimental data are in good agreement with the theory when the loss of the electron thermal conduction is considered. The conduction coefficient calculated according to the one-fluid model is larger than the Spitzer's classical value by a factor of 2-3. After about 3 μs, the electron temperature dropped sharply, the thermal conduction theory holds no longer. A possible explaination is that the end loss becomes dominant, and thus the plasma collapses rapidly.