Pure electron plasmas in asymmetric traps
Pure electron plasmas in asymmetric traps
复制标题
不对称陷阱中的纯电子等离子体
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
J. Fajans
中科院分区：
文献类型：
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作者：
R. Chu;J. Wurtele;J. Notte;A. J. Peurrung;J. Fajans
纯电子等离子体通常被限制在圆柱对称的潘宁陷阱中。本文研究了在外加电场不对称条件下囚禁在陷阱中的等离子体的静态和动态性质。推导出简单的分析理论并用于预测实验中观察到的稳定非圆形等离子体平衡的形状。分析和实验结果都与涡胞模拟的结果一致。对于圆柱对称阱中的l=1二极管模，等离子体作为刚性柱在圆形轨道上旋转。与此相反，在电场不对称的系统中的等离子体被示出为具有类似的l=1模式，其中等离子体的形状的变化，因为它在一个非圆形轨道旋转。这些散装等离子体的特点进行了研究与哈密顿模型。可以看出，对于小等离子体，当电场微扰时，电荷中心轨道所包围的面积是一个不变量。这个不变量是O…
Pure electron plasmas are routinely confined within cylindrically symmetric Penning traps. In this paper the static and dynamic properties of plasmas confined in traps with applied electric field asymmetries are investigated. Simple analytical theories are derived and used to predict the shapes of the stable noncircular plasma equilibria observed in experiments. Both analytical and experimental results agree with those of a vortex‐in‐cell simulation. For an l=1 diocotron mode in a cylindrically symmetric trap, the plasma rotates as a rigid column in a circular orbit. In contrast, plasmas in systems with electric field asymmetries are shown to have an analog to the l=1 mode in which the shape of the plasma changes as it rotates in a noncircular orbit. These bulk plasma features are studied with a Hamiltonian model. It is seen that, for a small plasma, the area enclosed by the orbit of the center of charge is an invariant when electric field perturbations are applied adiabatically. This invariant has been o...