Document Type : Research Paper

Authors

• Seyed Abolfazl Ghasemi ¹
• Motahare Lavasani ²
• masoud pishdast ³
• Jamalaldin YazdanPanah ⁴

¹ عضو هیات علمی

² دانشجو

³ دکتر

⁴ Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute

Abstract

By applying two relativistic high intensity laser beams under different conditions on low density plasma, the effects of beams relative distance and angle on their filamentation were investigated and studied. The results of the simulations using the particle in cell (SMILEI) two-dimensional code show that when the distance and the relative angel between the pulses is zero, the results are the same as a powerful pulse with the intensity equals four times a single pulse. Meanwhile, it was clear that, the impact of relative beams angles on the pulse filamentaion is so important and sensible than the effect of distance variation. So that, it is shown than by increasing the distance, separate plasma channels formed and more filaments observed. Moreover, the effect of relative beams angles variation reveal that, at unexpectedly, wo distinct channel formed and traveled through plasma so that by increasing the angle to , the channels merge together and formed a single wide channel. Further, for a constant beams distance, the maximum filaments observed at the middle angles . It should be noted that studying laser beams filamentation in plasma is so important for stable pulse propagation through the plasma and our simulations indicate that in some relative angles we will not have stable and efficient pulse propagation which could be distractive in some experiment such as inertial confinement fusion.

Keywords

• Kinetic energy of electron
• Laser-plasma interaction
• Particle in cell code
• Filamentation of laser beam
• SMILEI

Main Subjects

• PLASMA PHYSICS AND FUSION THECHNOLOGY