确定SF6-CO2预放电参数的激光脉冲方法

在均匀电场中,用高能激光脉冲释放初始电子以研究负电性气体的电子崩的发展,决定预放电过程的基本参数(游离系数α,吸附系数η和漂移速度v等)是一个有用的方法,本文对此方法做了详细的分析。采用这种方法对SF₆-CO₂混合气体做了研究,获得了10⁸个以上的初始电子及其分布,并给出了α/P,η/P和ν与E/P(E=电场强度,P=气体压力)的关系。本文还对所用的测量系统做了讨论,提出了改进办法。 关键词：

A LASER PULSE METHOD FOR DETERMINATION OF ELECTRON SWARM PARAMETERS IN SF6-CO2

Described in detail in this paper is a useful method which can be used to study avalanches in electronegative gases and then to determine electron swarm parameters (ionization coefficient α, attachment coefficient η, and drift velocity v) including the number and distribution of primary electrons released from the cathode of a parallel electrode configuration by high energy laser pulses. The method has been used to study electron swarm parameters in mixtures of SF₆ and CO₂. Relations between the parameters (α/P, η/P and ν) and E/P (E=electric field, P=gas pressure) are given. A number above 10⁸ of primary electrons has been obtained. The paper describes also the measurement system used in the study and improvements of the system that can be made.