Investigation of Coulomb collisional effects on plasma wave echo by using Particle-in-Cell simulation

• Main Authors: Bing-ZhangWu, 吳昺璋
• Other Authors: Yasutaro Nishimura
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/85jgzk

碩士 === 國立成功大學 === 太空與電漿科學研究所 === 106 === An electrostatic Particle-in-Cell (PIC) simulation is developed to investigate the origin of irreversibility in the electron plasma wave. By giving two external pulse electric field to the plasma, the temporal plasma echo is observed in the PIC simulation. If Coulomb collisional effects are considered, the plasma wave echo will become irreversible phenomena. The Coulomb collisional effect is manifested as the time-shift of the echo peak and the damping of the echo peak amplitude. Binary collisions into the PIC simulation is incorporated to demonstrate collisional effects on the plasma wave echo. A simplified algorithm which can approximate the N-body force calculation is employed learning from the Barnes and Hut algorithm by the gravitational problems.