非链式化学HF(DF)激光器工作气体中电子分离的非稳定性和气体放电等离子体的自组织现象

BELEVTSEV A A; FIRSOV K N; KAZANTSEV S Yu; KONONOV I G; 张来明

非链式化学HF(DF)激光器工作气体中电子分离的非稳定性和气体放电等离子体的自组织现象

1.
俄罗斯科学院高能密度研究所高温实验室, 莫斯科 125412;
2.
俄罗斯科学院普罗霍罗夫普通物理研究所, 莫斯科 119991;
3.
中国科学院长春光学精密机械与物理研究所, 激光与物质相互作用国家重点实验室, 吉林长春 130033

基金项目:

Supported by Russian Foundation for Basic Research Project(Grants No.08-08-00242 and 09-02-00475).

详细信息

中图分类号: TN248.5
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出版历程
- 收稿日期: 2010-08-13
- 修回日期: 2010-10-15
- 刊出日期: 2011-02-25

Electron detachment instability and self-organization of gas discharge plasma in working mixtures of chemical non-chain HF(DF) lasers

1.
Joint Institute for High Temperatures,Institute for High Energy Densities, Russian Academy of Sciences,Moscow 125412,Russia;
2.
Prokhorov General Physics Institute,Russian Academy of Sciences,Moscow 119991,Russia;
3.
State Key Laboratory of Laser Interaction with Mater,Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China

Funds:

Supported by Russian Foundation for Basic Research Project(Grants No.08-08-00242 and 09-02-00475).

摘要

摘要: 报道了放电引发的非链式HF(DF)激光器中的激活介质由电子碰撞负离子分离引起的电离非稳定性。这种非稳性出现在电极空间分离、脉冲CO2激光加热的基于SF6的混合气体的大体积放电中。实验研究了自引发体放电过程中由激光加热引起的放电等离子体的自组织现象以及由此在放电间隙的大部分区域形成的准周期等离子体结构。重点分析了等离子体结构随气体温度和注入能量的变化,讨论了等离子体自组织对电子碰撞分离不稳定性所产生的影响,解释了混合气体中由于电子碰撞使负离子消失导致的单等离子体通道移动的产生机理。
- HF/DF激光器 /
- 电离非稳定性 /
- 自组织现象 /
- 自引发体放电 /
- 等离子体结构
Abstract: This paper reports on investigating the ionization instability in active media of electric discharge non-chain HF(DF) lasers due to electron impact detachment of electrons from negative ions. This instability has been triggered in large volumes of SF6-based mixtures, spatially separated from electrodes, through the gas heating by a pulsed CO2 laser radiation. A self-organization phenomenon in a Self-sustained Volume Discharge(SSVD) on a laser-induced gas heating and resulting in formation of quasi-periodic plasma structures in the bulk of discharge gap is experimentally studied. Special attention is given to the evolution of these structures on changing the gas temperature and specific electric energy depositions. A plausible relation of the found self-organization effect to the electron detachment instability treated is discussed. Also suggested is the mechanism of moving a single plasma channel in working media of HF(DF) lasers owing to destruction of negative ions by electron impact.
- HF(DF) laser /
- electron detachment instability /
- self-organization phenomenon /
- self-sustained volume discharge /
- plasma structure

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参考文献(1)

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