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arXiv 2304.01151physics.plasm-ph
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一维混合 Vlasov-Maxwell 平衡中的混沌与可积磁场

Chaotic and integrable magnetic fields in one-dimensional hybrid Vlasov-Maxwell equilibria

Dimitrios A. Kaltsas, Philip J. Morrison, George N. Throumoulopoulos

AI总结:

本文提出了一维准中性混合 Vlasov-Maxwell 平衡模型,通过求解非齐次 Beltrami 方程确定磁场,发现对称分布下系统可积且轨迹规则,非对称分布则导致混沌,电子电流密度可改变相空间结构并诱导离子捕获。

摘要:

本文开发了一个具有动力学离子和无质量流体电子的一维(1-D)准中性混合 Vlasov-Maxwell 平衡模型,并推导了相关解。该模型允许通过准中性条件将静电势表示为矢势分量的函数。通过求解确定磁场的非齐次 Beltrami 方程来计算平衡态,其中非齐次项为动力学离子的电流密度,齐次项代表电子电流密度。我们证明相应的1-D系统是哈密顿系统,位置扮演时间的角色,对于在两个守恒粒子正则动量中对称的离子分布函数,其轨迹具有规则的周期行为。对于非对称分布函数,系统是不可积的,导致场的不规则和混沌行为。电子电流密度可以改变磁场相空间结构,诱导轨道捕获并将轨道组织成大的稳定岛。因此,电子贡献可以导致局部电场结构的出现,从而诱导离子捕获。我们还提供了一个使用旋转二维谐振子哈密顿量解析构造混合平衡的范例,能够计算解析磁场并构造用 Hermite 多项式表示的相应分布函数。

英文摘要:

In this paper, we develop a one-dimensional (1-D), quasineutral, hybrid Vlasov-Maxwell equilibrium model with kinetic ions and massless fluid electrons and derive associated solutions. The model allows for an electrostatic potential that is expressed in terms of the vector potential components through the quasineutrality condition. The equilibrium states are calculated upon solving an inhomogeneous Beltrami equation that determines the magnetic field, where the inhomogeneous term is the current density of the kinetic ions and the homogeneous term represents the electron current density. We show that the corresponding 1-D system is Hamiltonian, with position playing the role of time, and its trajectories have a regular, periodic behavior for ion distribution functions that are symmetric in the two conserved particle canonical momenta. For asymmetric distribution functions, the system is nonintegrable, resulting in irregular and chaotic behavior of the fields. The electron current density can modify the magnetic field phase space structure, inducing orbit trapping and the organization of orbits into large islands of stability. Thus the electron contribution can be responsible for the emergence of localized electric field structures that induce ion trapping. We also provide a paradigm for the analytical construction of hybrid equilibria using a rotating two-dimensional harmonic oscillator Hamiltonian, enabling the calculation of analytic magnetic fields and the construction of the corresponding distribution functions in terms of Hermite polynomials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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