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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Combined effect of secondary electron emission, plasma ion and electron number density variation due to dust charging and ionization-recombination processes on dust ion acoustic wave propagation
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Combined effect of secondary electron emission, plasma ion and electron number density variation due to dust charging and ionization-recombination processes on dust ion acoustic wave propagation

机译：粉尘带电和电离复合过程引起的二次电子发射，等离子体离子和电子数密度变化对粉尘离子声波传播的综合影响

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摘要

In a dusty plasma, in addition to influencing the dust charge state the secondary electron emission also leads to an enhancement of the electron number density. For proper accounting for secondary electron emission effect one has therefore, for the sake of consistency, also to take into account the ambient electron and ion loss due to charging collisions. The existence of a steady state for the dusty plasma is possible only through compensation of such particle losses or gain a likely candidate for which are ionization and recombination processes in dusty plasma. Taking into account the combined effects all these processes and assuming that the frequencies of the various types of interparticle collisions associated with the above-mentioned processes are much less than the dust ion acoustic (DIA) frequency it is shown that a small perturbation of the steady state of the dusty plasma may result in DIA wave growth provided the ionization rate is sufficiently high. Threshold values of the ratio of the ionization rate to recombination rate depending on different plasma parameters are shown graphically. The analysis presented is restricted to the case when the dust charge remains negative. It is seen that instability persists even when there is no secondary emission. The threshold for instability is lower for smaller values of the dimensionless charge parameter 2 z(0) = Z(d0)e(2)/aT(e) when secondary emission takes place, compared to the case when it is absent. The situation tends to get reversed as z(0) increases. The possibility of the existence of such instability was not noted earlier.
机译：在尘土等离子体中，除了影响尘埃带电状态外，二次电子发射还导致电子数密度的增加。为了正确考虑二次电子发射效应，因此，为了保持一致性，还必须考虑由于电荷碰撞引起的环境电子和离子损失。仅通过补偿这样的颗粒损失或获得尘埃等离子体中的电离和复合过程的可能候选物，尘埃等离子体才能存在稳态。考虑到所有这些过程的综合影响，并假设与上述过程相关的各种类型的粒子间碰撞的频率远小于尘埃离子声波（DIA）频率，因此可以看出，稳定器的扰动很小如果电离速率足够高，尘埃等离子体的状态可能会导致DIA波增长。图形化地显示了取决于不同血浆参数的电离速率与重组速率之比的阈值。提出的分析仅限于粉尘电荷保持为负的情况。可以看出，即使没有二次发射，不稳定性也会持续存在。与不存在二次发射的情况相比，当发生二次发射时，较小的无量纲电荷参数2 z（0）= Z（d0）e（2）/ aT（e）的不稳定性阈值较低。随着z（0）的增加，这种情况趋于逆转。较早之前没有指出存在这种不稳定的可能性。

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