Department of Astrophysical Sciences, Princeton University, New Jersey 08544, USA.
Phys Rev Lett. 2010 Oct 22;105(17):175003. doi: 10.1103/PhysRevLett.105.175003. Epub 2010 Oct 20.
Through particle-in-cell simulations, it is demonstrated that a part of the mechanical energy of compressing plasma can be controllably transferred to hot electrons by preseeding the plasma with a Langmuir wave that is compressed together with the medium. Initially, a wave is undamped, so it is amplified under compression due to plasmon conservation. Later, as the phase velocity also changes under compression, Landau damping can be induced at a predetermined instant of time. Then the wave energy is transferred to hot electrons, shaping the particle distribution over a controllable velocity interval, which is wider than that in stationary plasma. For multiple excited modes, the transition between the adiabatic amplification and the damping occurs at different moments; thus, individual modes can deposit their energy independently, each at its own prescribed time.
通过粒子模拟，证明通过在与介质一起压缩的等离子体中预先注入朗缪尔波，可以将压缩等离子体的部分机械能可控地转移到热电子。最初，波是无阻尼的，因此由于等离激元守恒，它在压缩下被放大。之后，随着相速度也在压缩下变化，在预定的时间可以感应出朗道阻尼。然后，波能量被转移到热电子，在可控的速度间隔内形成粒子分布，比在静止等离子体中更宽。对于多个激发模式，绝热放大和阻尼之间的转换发生在不同的时刻；因此，各个模式可以独立地将它们的能量沉积在各自规定的时间。
