Linearized potential of an ion moving through plasma
Linearized potential of an ion moving through plasma
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穿过等离子体的离子的线性化电势
DOI：
10.1017/s0022377800015178
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发表时间：
1990
影响因子：
2.5
通讯作者：
T. Peter
中科院分区：
文献类型：
--
作者：
T. Peter
本文研究了射弹离子通过经典各向同性电子等离子体的线性化Vlasov-Poisson方程在射弹速度vp范围内的解析解和数值解。我们的计算大大扩展了以前的计算范围，直到速度vp = 15 vth，显示了离子后面距离0 ≤ d ≤ 200λD的尾流场，其中vth是热电子速度，λD是等离子体的德拜长度。作为一个新的特征，我们证明了在vp/vth ≤ d/λD ≤/23（vp/vth）3区域内尾流场的振幅几乎是无阻尼的，并且只有在离离子较远的地方，尾流场才表现出在其他工作中所显示的1/d行为。因此，单个离子的尾流场持续的时间比以前想象的要长得多。这种效应是否会产生实际的后果，例如，离子束冷却的问题，简要说明。
The solution of the linearized Vlasov–Poisson equations describing a projectile ion moving through a classical isotropic electron plasma is investigated analytically and numerically for a wide range of projectile velocities vp Extending the range of earlier computations considerably, our calculations were performed for velocities up to vp = 15vth, showing the wake field behind the ion for distances 0 ≤ d ≤ 200λD, where vth is the thermal electron velocity and λD the Debye length of the plasma. As a new feature, we demonstrate that the amplitude of the wake field in the region vp/vth ≤ d/λD ≤/23(vp/vth)3 is almost undamped, and only for larger distances from the ion does it take the 1/d behaviour shown in other work. Thus the wake field of a single ion persists for much longer than previously thought. The question of whether this effect could have practical consequences, for example, for ion-beam cooling, is briefly addressed.