Theory of plasma contactors for electrodynamic tethered satellite systems
Theory of plasma contactors for electrodynamic tethered satellite systems
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电动系留卫星系统的等离子体接触器理论
DOI：
10.2514/3.25906
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
I. Katz
中科院分区：
文献类型：
--
作者：
D. Parks;I. Katz
来自地面和太空实验的最新数据表明，物体释放的等离子体极大地降低了物体与其周围的环境等离子体之间的鞘层阻抗。可用数据与本文开发的量化护套中电流流动的理论定性一致。理论上的电子传输基于无碰撞等离子体的流体模型，其有效碰撞频率与等离子体振荡频率相当。该理论导致有效阻抗与注入等离子体密度的平方根成反比变化。为了支持这种低阻抗操作模式，例如使用氩等离子体源，需要 //>-/<,730；也就是说，对于从环境等离子体中提取的每三十个电子，只需注入一个氩离子。所需的血浆流速相当低；要提取一安培的电子电流，每天需要大约一克氩气的质量流量。
Recent data from ground and space experiments indicate that plasma releases from an object dramatically reduce the sheath impedance between the object and the ambient plasma surrounding it. Available data are in qualitative accord with the theory developed herein to quantify the flow of current in the sheath. Electron transport in the theory is based on a fluid model of a collisionless plasma with an effective collision frequency comparable to frequencies of plasma oscillations. The theory leads to low effective impedances varying inversely with the square root of the injected plasma density. To support such a low-impedance mode of operation, using an argon plasma source for example, requires //>-/<,730; that is, only one argon ion must be injected for each thirty electrons extracted from the ambient plasma. The required plasma flow rates are quite low; to extract one ampere of electron current requires a mass flow rate of about one gram of argon per day.