Particle beam self-modulation instability in tapered and inhomogeneous plasma
Particle beam self-modulation instability in tapered and inhomogeneous plasma
复制标题
锥形和不均匀等离子体中的粒子束自调制不稳定性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Leemans
中科院分区：
文献类型：
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作者：
C. Schroeder;C. Benedetti;E. Esarey;F. Grüner;W. Leemans
从光束半径的演化方程出发，分析了锥形非均匀等离子体中的粒子束自调制不稳定性。对于足够快的锥度，抑制了不稳定性，并导出了抑制生长的条件。确定了在自调制光束驱动的等离子体波中采用锥形锁相的形式，可以使能量增益提高几个数量级。不稳定性的增长对初始背景等离子体密度涨落提出了严格的限制。
The particle beam self-modulation instability in tapered and inhomogeneous plasmas is analyzed via an evolution equation for the beam radius. For a sufficiently fast taper, the instability is suppressed, and the condition for growth suppression is derived. The form of the taper to phase lock a trailing witness bunch in the plasma wave driven by a self-modulated beam is determined, which can increase the energy gain by several orders of magnitude. Growth of the instability places stringent constraints on the initial background plasma density fluctuations.