论文标题
在Subterahertz辐射的准光束中维持的非平衡大气压等离子火炬
Non-equilibrium atmospheric-pressure plasma torch sustained in a quasi-optical beam of subterahertz radiation
论文作者
论文摘要
本文研究了通过263 GHz旋转的聚焦次赫氏射辐射维持的连续大气压排放。在空气周围气氛中，氩气流量出现了朝向微波辐射传播的等离子火炬。使用高速摄像头，研究了火炬的空间结构，并检查了20 ns阶的时间尺度上的时间动力学。光波长范围的发射光谱用于估计氩原子和电子密度的激发温度。结果表明，这种类型的排放基本上是非平衡的，并且电子温度比振动和气体温度高的倍，按数量级为1.5-1.7 eV。通过鲜明的氢管测量的电子密度超过了加热场频率的临界值。
This paper studies a continuous atmospheric-pressure discharge maintained by focused subterahertz radiation of a 263 GHz gyrotron. A plasma torch propagating towards microwave radiation was sustained on an argon flow exiting a metal gas tube in the surrounding atmosphere of air. Using a high-speed camera, the spatial structure of the torch was studied and the temporal dynamics on timescales of the order of 20 ns was examined. The emission spectra of the optical wavelength range were used to estimate the excitation temperature of argon atoms and electron density. It was shown that a discharge of this type is substantially non-equilibrium and the electron temperature is many times higher than the vibrational and gas temperatures, being 1.5-1.7 eV in order of magnitude. The electron density measured by the Stark broadening hydrogen lines exceeds a critical value for the frequency of the heating field.
