The Influence Of Laser Field On The Energy Loss For Ions In Plasmas

The energy loss in the process of interaction between charged particles and plasma is related to many applications in different scientific fields,such as heavy ion inertial confinement fusion?HICF?,magnetic confinement fusion,heavy ion electron cooling and so on.In the 1980s,the chirped pulse amplification technique created favorable conditions for the development of laser technology,which led to the study of the energy loss of the interaction between the charged particles and the plasma under the influence of the laser field.In particular,along with the development of accelerator,the heavy ion can be produced with higher energy,which prompted the study of stopping power between ions and plasma under a strong laser field.This paper is based on the theoretical model of Vlasov-Poisson equation,combined with the dielectric response theory and the Brandt-Kitagawa effective charge state theory.The model is set up to study the influence of laser field on stopping power for ions in plasma.Using the Molecular dynamics simulation method,numerical simulation is done to discuss the problem of energy loss for the interaction of atomic ion and plasma in the presence of an external laser field.Firstly,we study the energy loss of boron atom ion under the influence of laser field with the initial laser field anglea ?=?/3,plasma density n₀=10¹⁶cm^-3,and electron temperature T_e =3eV The results show that the stopping power of boron atom ions increases with the projectile speed in the early stage and decreases after a velocity,and the stopping power decreases for given ion projectile velocity along with the increasing of the laser field intensity.It is also found that the stopping power of boron atom ions can be affected by the laser frequency and laser angle of incidence.Subsequently,we choose the nitrogen atom ion as a study project.All simulation results are similar to the boron atom ion with the variation for laser parameters.However,by comparison with the stopping power of the boron atom ion and nitrogen atom ion,we find that the stopping power at the same laser intensity is different due to the different nuclear charge number.In order to further identify the law,we conducted a simulation of oxygen atom ion.The results show that:in the same laser field?a_E = 3?_D?,the stopping power of oxygen atom ion is greater than nitrogen atom ion,and the stopping power of nitrogen atom ion is greater than boron atom ion.So the stopping power will increase with the increase of nuclear charge number.Based on the simulation of boron atom ion,nitrogen atom ion and oxygen atom ion,the results show that the laser field intensity is an important factor to influence the interaction between atomic ions and plasmas.The stopping power of atomic ions decreases with the increasing of the laser field intensity.And the stopping power of atomic ions can be modulated by the laser frequency and laser angle of incidence.In addition,the stopping power will increase with the increase of nuclear charge number.