空心阴极放电条纹特性的光谱诊断

Spectroscopic Diagnosis of Striation in Hollow Cathode Discharge

利用发射光谱法,研究了圆柱型空心阴极放电条纹的特性。测量了条纹区的发射光谱,在此基础上计算得到了电子激发温度、相对电子密度和电子平均能量的空间分布特性。结果表明条纹区的光强、电子激发温度和电子密度均呈非等幅的周期性变化。与暗纹中心处相比,明纹中心具有较高的电子激发温度和较低的电子密度。由阴极向阳极,明纹中心处的电子激发温度幅值逐渐减小。此外,条纹区的电子激发温度随着电流的增加而增加。

The characteristics of striations in cylindrical hollow cathode discharge were investigated experimentally.The emission intensity and spectra of striations were measured,and the spatial characteristics of electron excitation temperature and relative electron density were calculated.It is shown that the emission intensity,the electron excitation temperature and the electron density appear as a periodic structure.The electrons have higher excitation temperature but lower density in the bright regions compared with the dark regions.The electron excitation temperature in the bright regions decreases from the cathode to the anode.It is also shown that the electron excitation temperature increases with increasing current.