Direct Current Excimer Laser

在高压辉光放电中产生的弱电离等离子体能够反射或吸收电磁辐射，从而作为这种辐射的暂时可控屏障。提出对大气中辉光放电的物理特性进行研究，特别是对辉光放电的阴极跌落进行研究。由阴极跌落引起的不稳定性一直是高压辉光放电正常运行的主要障碍。我们建议探索使用微空心电极放电作为阴极下降的稳定元素。除了稳定作用外，微空心电极阵列还可以作为主放电的高发射阴极。通过在比主放电持续电压低的电压下脉冲微空心阴极放电，主放电的时间控制应该是可能的。利用开式快门、条纹摄影和光谱学等电学和光学诊断方法获取微空心电极放电信息，利用差分泵浦延迟场分析仪测量微空心等离子体阴极的电子发射。将探讨薄膜技术在微电极板开发中的应用。位于新泽西州霍博肯的史蒂文斯理工学院（Stevens Institute of Technology）正在努力通过减少燃烧化学导致的电子附着来减少主放电中的功率损失。由AFOSR支持。打算与这个研究小组合作，并将通过与p.l. E. Kunhardt的咨询协议来促进合作。所提出的范围与等离子体屏障以外的其他应用有关。例如，用于敏捷反射镜的可控等离子体阴极，以及使用由空心电极放电阵列产生的等离子体护套，用于减少沿表面流动的空气阻力

9803997SchoenbachWeakly ionized plasmas, generated in high pressure glow discharges, are able to reflect or absorb electromagnetic radiation and consequently act as temporally controllable barriers for this radiation. It is proposed to study the physics of do glow discharges in atmospheric air, particularly the cathode fall of these discharges. Instabilities which evolve from the cathode fall, have so far been the major obstacle for do operation of high pressure glow discharges. We propose to explore the use of microhollow electrode discharges as stabilizing elements for the cathode fall. In addition to the stabilizing effect, microhollow electrode arrays serve as highly emissive cathodes for the main discharge. Temporal control of the main discharge should be possible by pulsing the microhollow cathode discharge affay at voltages low compared to the sustaining voltage of the main discharge. Electrical and optical diagnostic methods, such as open shutter and streak photography and spectroscopy, will be used to obtain information on the microhollow electrode discharges The electron emission of microhollow plasma cathodes will be measured by means of a differentially pumped retarding field analyzer. The use of thin film technologies for the development of microelectrode panels will be explored. Efforts to reduce the power losses in the main discharge through reduction of electron attachment as a result of combustion chemistry are under way at Stevens Institute of Technology, Hoboken, NJ. supported by AFOSR. Cooperation with this research group is intended and will be facilitated through a consulting agreement with the P.L, E. Kunhardt. The proposed reach has relevance for other applications besides plasma barriers. Examples are controllable plasma cathodes for agile mirrors, and the use of plasma sheaths, generated by hollow eletrode discharge arrays for drag reduction of air flow along surfaces.***