Onset of nonlinear regime in beam-plasma interactions
Onset of nonlinear regime in beam-plasma interactions
复制标题
束-等离子体相互作用中非线性状态的开始
DOI：
10.1088/0022-3727/34/9/313
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. J. Schep
中科院分区：
文献类型：
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作者：
V. Goloviznin;T. J. Schep
本文研究了相对论电子束团激发强轴对称等离子体波的过程。众所周知，在一维几何中，当束流密度接近等离子体密度的一半时，激发波基本上变成非线性的，并且在束流密度高于该密度时发生波破碎。然而，这种简单的关系在三维空间中并不成立。我们发现，总束流，不仅是电流密度，应超过一定的阈值，非线性变得可见。就在最近，加速器技术的新发展使得产生足够强大的相对论电子束进入这种非线性区域成为可能。我们表明，一个现实的电子束从一个先进的加速器可以产生在其唤醒加速场远高于10 GeV m-1。
We consider the process of excitation of a strong axisymmetrical plasma wave by a relativistic electron bunch. It is well known that in one-dimensional geometry the excited wave becomes essentially nonlinear when the beam density approaches half the plasma density, and wavebreaking occurs at beam densities higher than that. Such a simple relation, however, does not hold in three dimensions. We find that the total beam current, not only the current density, should exceed a certain threshold for nonlinearity to become visible. Just recently, new developments in accelerator technology have made it possible to produce relativistic electron beams powerful enough to enter this nonlinear regime. We show that a realistic electron bunch from an advanced accelerator can generate in its wake accelerating fields well above 10 GeV m-1.