Formation of the double layr in tow temperature plasma

低温等离子体中双层的形成

• 批准号: 04680017
• 负责人: KAWAMURA Kazutaka
• 金额: $ 1.28万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04680017/
• 关键词: CURRENT FREE DOUBLE LAYER; TWO-TEMPERATURE-PLASMA; LaB_6HOLLOW CATHODE; POTENTIAL FORMATION; ELECTRON DISTRIBUTION; EMISSIVE PROBE; CATHODE SHEATH; ダブルレイヤー; ホロー陰極; 高速電子; LaB_6; グロー・アーク; 遷移領域

A current-free double layr near the cathode wall has been experimentally investigated in a two-electron-temperature plasma by using a LaB_6 hollow cathode tube. This LaB_6 hollow cathode tube allows us to have stable discharge with two-electron-temperature plasma in the glow-arc transition during which the discharge characteristics change from the glow to the arc. In the glow-arc transition, the interactions of beam electrons is very strong because of the high-voltage discharge and the thermionic electron emission effect. The electron distribution composed of two Maxwellians at different temperatures is observed in the LaB_6 hollow cathode tube. The electron population at this tube consists of a cold, high-density Maxwellian and a hot, low-density Maxwellian. The ratio of n_h to n_c is controlled by varying the argon neutral gas pressure while maintaining a constant discharge current (I_d = 1.0 A). As the gas pressure is decreased, n_h/n_c increases in the LaB_6 hollow cathode tube. At the same time, the current-free double layr are localized electrostatic potential structure created at the distance from the cathode wall of 5 mm.

用LaB_6空心阴极管在双电子温度等离子体中对阴极壁附近的无电流双层进行了实验研究。这种LaB_6空心阴极管使我们能够在辉光-电弧过渡过程中获得稳定的双电子温度等离子体放电，在此过程中，放电特性从辉光转变为电弧。在辉光-电弧转变过程中，由于高压放电和电子发射效应，束流电子之间的相互作用非常强。在LaB_6空心阴极管中观察到不同温度下两个麦克斯韦分布的电子分布。电子在这个管的人口组成的冷，高密度麦克斯韦和热，低密度麦克斯韦。通过改变氩中性气体压力来控制n_h与n_c的比值，同时保持恒定的放电电流（Id = 1.0 A）。随着气压的降低，LaB_6空心阴极管中的n_h/n_c增大。同时，无电流双层是在距阴极壁5 mm处产生的局部静电势结构。

项目成果

M.Matsumoto: "Production of Free Radicals by Magnetized Sheet Plasma" Proceedings of 2nd International Conference on Reactive Plasma and 11th Symposium on Plasma Processing. 1. 139-142 (1994)

M.Matsumoto：“磁化片状等离子体产生自由基”第二届国际反应等离子体会议和第十一届等离子体处理研讨会论文集。

Akira Tonegawa: "A Compact Sheet Ion Source for Metal Ion Beam" Nuclear Instruments and Methods.

利根川彰：“用于金属离子束的紧凑片离子源”核仪器和方法。

K.Nanri: "Ion Cycrotron Reseonance Using a Magnetized Sheet Plasma" Proceedings of the 5th International Conference on Ion Sourcs, Beijing, China. 1. 67 (1993)

K.Nanri：“使用磁化片状等离子体的离子回旋加速器共振”第五届国际离子源会议论文集，中国北京。

S.Tanabe: "Low Temperature Plasma Source" Proceedings of 2nd International Conference on Reactive Plasma and 11th Symposium on Plasma Processing. 1. 139-142 (1994)

S.Tanabe：“低温等离子体源”第二届国际反应等离子体会议和第十一届等离子体处理研讨会论文集。

K.Sunako: "Production of Oxygen Sheet Plasma" Proceedings of the 2nd International Conference on Reactive Plasma and 11th Symposium on Plasma Processing. 1. 123-126 (1994)

K.Sunako：“氧气片等离子体的生产”第二届国际反应等离子体会议和第十一届等离子体处理研讨会论文集。