自洽单波模型中长时间离散粒子效应与动力学理论的关系
Long-time discrete particle effects versus kinetic theory in the self-consistent single-wave model
摘要：
本文研究了无碰撞等离子体中耦合到单色波上的有限粒子数N的影响。对于波的增长和阻尼，离散粒子数值模拟显示了由单个粒子的动力学引起的N依赖的长时间行为。这种行为不同于由Vlasov方法引起的数值误差。捕获振荡对于长时间动力学是至关重要的，因为波振荡由颗粒分布不均匀性控制，并且脉动分界线交叉驱动弛豫朝向热平衡。
英文摘要：
The influence of the finite number N of particles coupled to a monochromatic wave in a collisionless plasma is investigated. For growth as well as damping of the wave, discrete particle numerical simulations show an N-dependent long time behavior resulting from the dynamics of individual particles. This behavior differs from the one due to the numerical errors incurred by Vlasov approaches. Trapping oscillations are crucial to long time dynamics, as the wave oscillations are controlled by the particle distribution inhomogeneities and the pulsating separatrix crossings drive the relaxation towards thermal equilibrium.
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