Collisionless absorption in clusters out of linear resonance (12 pages)
Collisionless absorption in clusters out of linear resonance (12 pages)
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线性共振簇中的无碰撞吸收（12 页）
DOI：
10.1103/physreva.71.063201
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发表时间：
2005
影响因子：
2.9
通讯作者：
M. Kanapathipillai
中科院分区：
文献类型：
--
作者：
P. Mulser;M. Kanapathipillai
到目前为止，所有在无碰撞域中的团簇加热的解析模型都是基于线性或线性化的概念，如Mie共振或其他线性振荡。它们的特征是恒定的特征频率，远高于大多数强激光的频率。在本文中，我们证明了非线性共振激发构成了在无碰撞域吸收的基础，对于单个电子和整个电子束。随着粒子在自身空间电荷场中振荡振幅的增大，粒子的本征周期增大，在足够的驱动强度下，本征周期等于并超过恒定激光周期。在交叉点，基本上只有在那里，共振吸收发生。无论是本身的非线性，还是团簇电子云的不对称激发，都不会导致不可逆的能量增益。
So far all analytic models of heating of clusters in the collisionless domain are based on linear or linearized concepts, like Mie resonance or other linear oscillations. They are characterized by constant eigenfrequencies lying well above the frequencies of most intense lasers. In this paper we show that nonlinear resonant excitation constitutes the basis of absorption in the collisionless domain, for individual electrons as well as for entire electron bunches. With increasing amplitude of the particles oscillating in their own space charge field their eigenperiod increases and at sufficient driver strength it equals and exceeds the constant laser period. At the crossing point, and essentially only there, resonant absorption takes place. Neither nonlinearities in themselves nor asymmetric excitation of the electron cloud of the cluster leads to irreversible energy gain.