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arXiv 0811.1760physics.plasm-ph
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laser驱动电子对聚变靶的快速点火

Fast ignition of fusion targets by laser-driven electrons

J. J. Honrubia, J. Meyer-ter-Vehn

摘要:

在充分考虑集体磁效应和背景等离子体流体动力学响应的基础上,对预压缩聚变靶中的快电子输运和能量沉积进行了混合粒子模拟.内爆快速点火配置的实际点火结果显示在最近的实验中发现的光束发散度增加[J. S. Green等人,物理修订信函100,015003(2008)]和由于通过高级PIC模拟预测的轮廓陡化而导致的电子动能的减少[B. Chrisman等人,Phys.Plasmas 15,056309(2008)]。研究了靶点火与注入电子能量、锥尖到致密核的距离、相对论电子束的初始发散角和动能的关系。我们发现,光束准直大大降低了点火能量的锥形引导燃料配置假设在这里。

英文摘要:

We present hybrid PIC simulations of fast electron transport and energy deposition in pre-compressed fusion targets, taking full account of collective magnetic effects and the hydrodynamic response of the background plasma. Results on actual ignition of an imploded fast ignition configuration are shown accounting for the increased beam divergence found in recent experiments [J.S. Green et al., Phys. Rev. Lett. 100, 015003 (2008)] and the reduction of the electron kinetic energy due to profile steepening predicted by advanced PIC simulations [B. Chrisman et al. Phys. Plasmas 15, 056309 (2008)]. Target ignition is studied as a function of injected electron energy, distance of cone-tip to dense core, initial divergence and kinetic energy of the relativistic electron beam. We found that beam collimation reduces substantially the ignition energies of the cone-guided fuel configuration assumed here.

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