Relativistic effects on the collisionless-collisional transition of the filamentation instability in fast ignition
Relativistic effects on the collisionless-collisional transition of the filamentation instability in fast ignition
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DOI：
10.1017/s0022377810000413
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发表时间：
2010-12
影响因子：
2.5
通讯作者：
M. Fiore;F. Fiuza;M. Marti;R. Fonseca;Luís O. Silva
中科院分区：
文献类型：
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作者：
M. Fiore;F. Fiuza;M. Marti;R. Fonseca;Luís O. Silva
通过对快点火（FI）构型的无碰撞和有碰撞两种情况的比较，分析和数值研究了相对论碰撞对双压缩不稳定性的影响。理论动力学模型，包括温暖的物种和空间电荷效应，预测优先形成较大的长丝和抑制/增强的不稳定性时，碰撞占。这些碰撞效应的定性和定量确认的1D和2D粒子在细胞（PIC）模拟，也提供了一个物理图片的抑制/增强制度由于碰撞，基于电子束减速。通过在色散关系中插入典型的FI参数，理论模型预测FI目标内部深处的不稳定性的显着增长率，从而显示出作为能量沉积到芯块核心中的机制的双折射不稳定性的潜在作用。
Relativistic collisional effects on the filamentation instability are analytic-ally and numerically investigated by comparing collisionless and collisional scenarios for a fast ignition (FI) configuration. The theoretical kinetic model, including warm species and space charge effects, predicts the preferential formation of larger filaments and the inhibition/enhancement of the instability when collisions are accounted for. These collisional effects are qualitatively and quantitatively confirmed by 1D and 2D particle-in-cell (PIC) simulations, also providing a physical picture for the inhibition/enhancement regime due to collisions, based on the electron beam slowdown. By plugging typical FI parameters in the dispersion relation, the theoretical model predicts significant growth rates of the instability deep inside the FI target, thus showing the potential role of the filamentation instability as a mechanism for energy deposition into the pellet core.