Power Consideration for Pulsed Discharges in Potassium Seeded Argon

Minimization of energy consumed in plasma generation is critical for applications, in which a large volume of plasmas is needed. We suggest that a high electron density atmospheric pressure plasmas can be generated by pulsed discharges in potassium seeded argon at an elevated temperature with a very small power input. The ionization efficiency and power budget of pulsed discharges in such plasmas are analytically studied. The results show that ionization efficiency of argon, especially at small reduced electric field E/N （the ratio of the electric field to the gas number density）, is improved effectively in the presence of small amount of potassium additives. Power input of pulsed discharge to sustain a prescribed average level of ionization in potassium seeded argon is three orders of magnitude lower than that in pure argon. Further, unlike in pure argon, it is found that very short high-voltage pulses with very high repetition rates are unnecessary in potassium seeded argon. A pulse with lOOns of pulse duration, 5kHz of repetition rate, and 2Td （1 Td = 1 × 10^-21 Vm^2） of E/N is enough to sustain an electron density of 10^19 m^-3 in 1 arm 1500K Ar＋0.1% K mixture, with a very small power input of about 0.08 × 10^4 W/m^3.     

毛细管等离子体射流技术研究现状及应用前景

 毛细管放电等离子体是近年来发展起来的一种新型脉冲高能粒子源，可以产生高温、高密和高速等离子体射流，具有推进、发射、加速等功能，可以加热或引燃化学工质，具有广泛的应用前景。介绍了毛细管等离子体的基本原理和特点，综述了国内外研究现状，对毛细管等离子体应用前景进行了展望，以期引起我国对这一技术研究的重视，促进毛细管等离子体技术的发展。     

两间隙毛细管等离子体射流发生器主放电数值模拟

 消融放电毛细管等离子体发生器产生的等离子体射流具有密度高和温度相对低的特性,在许多领域都具有潜在的应用前景。利用1维流体模型对两间隙毛细管等离子体射流发生器的主放电特性进行了模拟计算分析。模型考虑了焦耳热效应和管壁烧蚀对放电特性的影响。在管壁消融这种反馈稳定机制作用下,毛细管放电处于准稳态,其产生的等离子体温度在放电期间保持恒定。在放电能量为1 kJ的条件下,聚乙烯毛细管等离子体温度可达3 eV,电子密度可达1025 m-3量级,射流速度接近10 km/s。改变放电输入的焦耳热功率密度,等离子体温度和速度变化较小,但气压、质量密度以及等离子体电子密度等特性参数均可以获得较大幅度的改变。