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 ...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 5×10^(18) W/cm^(2). 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.展开更多
The propagation of a laser pulse with a peak intensity 10^(19)W/cm^(2) through the preformed underdense plasma with the density 0.014nc are studied by using two-dimensional particle-in-cell simulations.The longitudina...The propagation of a laser pulse with a peak intensity 10^(19)W/cm^(2) through the preformed underdense plasma with the density 0.014nc are studied by using two-dimensional particle-in-cell simulations.The longitudinal electron heating is identified and verified,and its major property agrees with the theoretical prediction.The electron distributions in phase space,patterns of the electric fields,profiles of the ion or electron density and other plasma nonlinear phenomena are presented and discussed.展开更多
基金Supported by the Hi-Tech ICF Committee of China and the National Natural Science Foundation of China under Grant Nos.10085002 and 19885008.
文摘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 5×10^(18) W/cm^(2). 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.
基金Supported by the National Natural Science Foundation of China under Grant No.19885008the National High Technology Commit tee in China.
文摘The propagation of a laser pulse with a peak intensity 10^(19)W/cm^(2) through the preformed underdense plasma with the density 0.014nc are studied by using two-dimensional particle-in-cell simulations.The longitudinal electron heating is identified and verified,and its major property agrees with the theoretical prediction.The electron distributions in phase space,patterns of the electric fields,profiles of the ion or electron density and other plasma nonlinear phenomena are presented and discussed.
