Anomalous resistance of plasmas in sub-critical electric fields
Anomalous resistance of plasmas in sub-critical electric fields
复制标题
亚临界电场中等离子体的反常电阻
DOI：
10.1088/0029-5515/10/2/008
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发表时间：
1970
期刊：
影响因子：
3.3
通讯作者：
K. Stepanov
中科院分区：
文献类型：
--
作者：
V. Sizonenko;K. Stepanov
基于弱湍流理论，表明限制电场中载流等离子体中离子声不稳定性发展的主要机制可能是电子振荡的非线性散射。湍流离子声脉冲的能量密度为 W∼(2me/mi)n0 Te，其中 n0 是等离子体密度，Te 是电子温度，m6ij 是电子和离子质量。湍流脉动引起的电子散射以有效频率 νs ∼ (2me/mi) ωpe 发生，并导致异常的有效等离子体电导率 ，其中 ωpe 是电子朗缪尔频率。当电流速度小于电子的热速度时，弱电场 (E<Ecr = (me/e) vthνs) 中的等离子体会出现离子声不稳定性。高温稀等离子体中的临界场 Ecr 比 Dreicer 场 EDr = (me/e) vthνc 强得多，其中 νc 是电子-离子碰撞频率。 σ 和 νs 的估计值与在许多湍流等离子体加热实验中进行的电导率测量结果非常一致。
On the basis of the theory of weak turbulence it is shown that the principal mechanism limiting the development of ion-acoustic instability in a current-carrying plasma in an electric field can be the non-linear scattering of oscillations by electrons. The energy density of turbulent ion-acoustic pulsations is of the order W∼(2me/mi)n0 Te, where n0 is the plasma density, Te the electron temperature and m6ij the electron and ion mass. Electron scattering by turbulent pulsations occurs with an effective frequency νs ∼ (2me/mi) ωpe and leads to an anomalous effective plasma conductivity , where ωpe is the electron Langmuir frequency. Ion-acoustic instability develops in a plasma in weak electric fields (E<Ecr = (me/e) vthνs) when the current velocity is less than the thermal velocity of the electrons, . The critical field Ecr in a high-temperature dilute plasma is much stronger than the Dreicer field EDr = (me/e) vthνc, where νc is the electron-ion collision frequency. The estimates of σ and νs are in good agreement with conductivity measurements made in a number of turbulent plasma heating experiments.