高电离尘埃等离子体中的辐射凝聚不稳定性
Radiation-condensation instability in a highly ionized dusty plasma
摘要：
考虑了辐射冷却尘埃等离子体中线性扰动的动力学，尘埃（$Z_d$）和等离子体（$Z_p$）成分的电荷随密度变化。结果表明，在对应于特征冷却长度的长波长极限，当等离子体可以被视为准中性，尘埃粒子的存在改变了辐射不稳定性的标准，无论尘埃粒子的充电过程。特别是，凝聚（等压）模式被证明是稳定的（不稳定），如果在平衡，尘埃$n_d$和等离子体$n$的准中性条件下的密度之间的关系，$(d\ln n_{d}/d \ln n)_{q}<1$（$>1$）是满意的，而等熵模式是稳定的（不稳定）时，发生相反的不平等;等容模式是不变的。数值估计表明，这些影响可能是重要的热相（$T\sim 10^{6}$ K）的星际等离子体，并在托卡马克等离子体附近的墙壁。
英文摘要：
The dynamics of linear perturbations in a radiatively cooling dusty plasma is considered, with the charge of both dust ($Z_d$) and plasma ($Z_p$) components being allowed to vary with their densities. It is shown that in the long-wavelength limit corresponding to the characteristic cooling length, when the plasma can be treated as quasineutral, the presence of dust particles changes the criteria for radiation instability, regardless the charging process of the dust particles. In particular, the condensation (isobaric) mode is shown to be stabilized (destabilized) if in the equilibrium, the relation between densities of the dust $n_d$ and plasma $n$ under the quasineutrality condition, $(d\ln n_{d}/d \ln n)_{q}<1$ ($>1$) is satisfied, while the isentropic mode is stabilized (destabilized) when the opposite inequalities take place; the isochoric mode is unaltered. Numerical estimates show that these effects can be important in hot phases ($T\sim 10^{6}$ K) of the interstellar plasma, and in tokamak plasma near the walls.
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