激光等离子体相互作用的局域振荡电子加热机制
Local oscillating electron heating mechanism during laser plasma interaction
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摘要: 用2.5维粒子模拟程序模拟了超强激光与等离子体的相互作用过程，发现超强激光可以通过J×B加热机制加速电子并引起电荷分离，从而产生很强的静电场并形成电场势阱，电子在静电场势阱中振荡，被多次加速，使得高速电子被甩出势阱，进而增强电荷分离，然后静电场结构被破坏，静电势能传给电子。在此过程中，电子在此阱中作局域振荡，并且被J×B机制多次加速，激光的能量会有效地传给电子，使电子能量高达10MeV。这是一种新的电子加热机制，称之为局域振荡电子加热机制。
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关键词:
- 激光等离子体相互作用 /
- 粒子模拟 /
- 电子加速 /
- 局域振荡
Abstract: The interaction between laser and plasma has been studied using a 2.5 dimensional particle simulation code. The results show that electrons are accelerated by J×B heating mechanism and a strong electrostatic field is caused by charge separation, which has a potential well structure. Electrons are oscillating in electrostatic field potential wells and can be accelerated many times. Some electrons with higher velocity escape from potential wells, so that charge separation becomes stronger and stronger, and then electrostatic fields break up and electrons get the energy of electrostatic field. During the process, electrons are oscillating locally and accelerated, their relativistic kinetic energy can reach over 10 MeV. This is a new kind of heating mechanism and is named local oscillating el -
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