Eztending the Concept of Debye Length for Chasmas
(0) Chasmas are a generalization of plasmas, i.e., the condition of quasi-neutrality is dropped. That means that in chasmas the quasi-neutrality may be (strongly) violated over distances many times the Debye length which requires special circumstances (double layers, electric fields,...). The question arises what the meaning is of a shielding length in chasmas. It was demonstrated that the so-called chasma (angular) frequency has an expression similar to the plasma frequency:w2c=｜n_-n+｜e2／em_.However, this chasma frequency plays a role as well in the equilibrium (or steady state) as in the stability. Similarly for the chasma equilibrium we obtained a kind of Debye length λ2c=2ekBT／｜n_-n+｜e2,where the difference of the densities occurs in contrast to the shielding length λ2D=2ekBT／｜n_-n+｜e2,for a chasma equilibrium, sup-posing that the temperature of electrons and ions is the same, that the ions are only once ionized and that the kinetic energy is much larger than the potential energy. This means that the chasma shielding length is much the same as the Debye length and that (λDwp)2≈(λcwc)2≈kBT／m_. We expect those features to be relatively universal, up to factors of order unity, in spite of the great variety of chasmas.
D.K.Callebaut H.Kikuchi
Physics Dept.,CDE,University of Antwerp,Antwerp,B-2610,Belgium Institute for Environmental Electromagnetics,Tokyo 170,Japan
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-4
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）