Particle Simulation Research on the Detailed Process of Bubble Generation

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（12）
• 所属期刊栏目: ATOMIC AND MOLECULAR PHYSICS
• 页码范围: 1628-1631
• 页数: 4页
• 分类号: O4
• 语种: 英文

摘要

The detailed process of bubble generation in laser-plasma interaction has been studied by particle simulation. During the interaction between laser and plasma, a strong electrostatic field caused by charge separation is observed, whose structure looks like a potential well. Electrons are accelerated to 10 MeV within some tens of femtoseconds when the laser intensity is 5× 1018 W/cm2. After many electrons escape from the potentiaLwell-like structure, electron cavitons are generated. Because of laser filamentation, the intensity of the laser becomes very asymmetric, the caviton structure is squeezed and deformed, and then electron bubbles are generated, whichfinally results in ion bubble formation. It is the electron caviton and laser beam filamentation that cause bubble generation. The i0 MeV superthermal electron generation accompanied by the electron caviton is attributed to EV . E heating, which is a locally oscillating electron heating mechanism.