论文标题
在低气压下长管中的低频单电极排放
Low-frequency one-electrode discharge in long tubes at low gas pressure
论文作者
论文摘要
在压力1-4 Torr时，研究了一个电极电容放电的特异性形式。放电的主要特征是给定极性的电压脉冲的低速率（小于10 kHz），该脉冲仅应用于管的一个电极，而另一个则保持自由或丢失。这种类型的排放命名为单电极排放（OED），似乎在先前的研究中没有描述。排放量被视为占据整个管子或其部分取决于实际电压振幅及其速率的发光等离子体柱。电流静电特性，点火阈值和OED长度变化模式表明了RF放电未知的特征。发现OED中的等离子体产生机制包括组成和旅行的电离波（IW）。结果表明，波动运动的特征是明显的衰减，其模式通过时间位图方法进行了研究。衰减指定占用的血浆面积以及其他OED参数的长度。提出了波传播的运动学模型。该模型允许通过当前测量值估算不同OED点以及平均电子浓度的电场。上述参数的典型值为$ 5 v/cm $和$ 10^9-10^{10} $ $ $ CM^{ - 3} $。结果表明，IW前部后面的非均匀电场为实验中观察到的等离子体通道条纹出现而产生了条件。霓虹灯中发现的固定条纹对于负极性OED更为独特。结果表明，在血浆中存在亚稳态存在的电离饮用机制似乎足以满足OED条纹描述。
The specific form of one electrode capacitive discharge was studied in long tubes filled with high purity neon or argon at pressure 1-4 Torr. The main feature of the discharge is the low rate (less than 10 kHz) of the voltage pulses of given polarity which are applied to only one electrode of the tube, while another one remains free or missing. This type of the discharge was named one-electrode discharge (OED), and seems not to be described in previous studies. The discharge is observed as a glowing plasma column which occupies either entire tube or its part dependent on actual voltage amplitude and on its rate. Current-volt characteristics, ignition thresholds and the OED length changing patterns demonstrate features unknown for RF discharges. It was found that the plasma generation mechanism in OED consists in formation and traveling of the set of ionization waves (IW). It was shown that the wave motion is characterized by a pronounced attenuation the patterns of which were investigated by the time-position diagrams method. The attenuation specifies the length of the occupied plasma area as well as other OED parameters. Kinematic model of the wave propagation is proposed. This model allows to estimate the electric field in different OED points as well as average electron concentration via the current measurements; the typical values of the above parameters are $5 V/cm$ and $10^9-10^{10}$ $cm^{-3}$. It was shown that nonhomogeneous electric field behind the IW front creates the conditions for appearance of plasma channel striations observed in the experiment. The stationary striations found in neon are more distinctive for negative polarity OED. It was shown that ionization-drift mechanism with account of metastable states existence in plasma seems to be much adequate for the OED striation description.
