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arXiv physics/06081512006-08-15physics.plasm-ph

平面电子云膨胀场中离子加速实验

Test Ion Acceleration in the Field of Expanding Planar Electron Cloud

M. M. Basko

备注：: 14 pages, 10 Postscript figures

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摘要：

得到了新的精确结果的相对论加速的测试正离子在非玻尔兹曼层流区的平面电子鞘演变从最初的单能电子分布。电子动力学分析的背景下，静止的箔离子。加速离子的极限γ因子主要由离子-电子荷质比和加速电子的初始γ因子的值决定：这两个量之间存在一个临界关系，它决定了离子是否能超过以初始电子速度移动的电子前沿。它被证明，在现实中的质子和较重的测试离子永远无法赶上电子前，为他们的最大能量的一个适当的中间渐近公式推导。对层流区结果的适用范围进行了详细的分析。

英文摘要：

New exact results are obtained for relativistic acceleration of test positive ions in the non-Boltzmann laminar zone of a planar electron sheath evolving from an initially mono-energetic electron distribution. The electron dynamics is analyzed against the background of motionless foil ions. The limiting gamma-factor of accelerated ions is shown to be determined primarily by the values of the ion-electron charge-over-mass ratio and the initial gamma-factor of the accelerated electrons: there exists a critical relationship between these two quantities, which determines whether the ion can overtake the electron front moving with initial electron velocity. It is proven that in reality protons and heavier test ions can never catch up with the electron front; for their maximum energy an appropriate intermediate asymptotic formula is derived. The domain of applicability of the laminar-zone results is analyzed in detail.

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