电子发射对稳态等离子体鞘层影响的理论研究和数值模拟
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摘要: 建立了一套非线性自洽的流体力学方程组，研究了电子发射对稳态等离子体鞘层的影响，并分别考虑了发射电子及离子同中性原子的弹性和非弹性碰撞过程。数值结果表明：发射电子的初始束流密度及中性气体密度是描述鞘层空间演化的两个最关键的物理量，特别是发射电子的存在使得鞘层厚度变薄。Abstract: A hydrodynamics model was used in this paper to study the effects of the electron emission on the steady-state sheaths, which includes the emitted electron-neutral atom collisions and the ion-neutral atom collisions. Numerical results show that the initial emitted electron bean-current density and the neutral gas density are two important physics quantities affecting the sheath parameters, such as the ion density, ion current density, and the sheath electric field.
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Key words:
- emitted electrons /
- beam current density /
- plasma sheath
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