Weibel Instability and Thermal Flux Reduction by the Instability in Ultraintense Laser-Plasma Interactions

摘要

The interaction of ultraintense laser pulses with overdense plasmas is studied by theory and three-dimensional particle-in-cell simulations. Self-generated magnetic fields are observed in the plasma target owing to the Weibel instability. The growth rates of the self-generated magnetic fields in our theory are in good agreement with the results of our simulations. It is found that the thermal flux of high energy electrons is reduced by the magnetic fields of Weibel instabilities. In the fast ignitor scheme, the thermal flux reduction contributes to the energy increase in the center of the compressed core.