The charging of electrophilic dust in plasma studied by PIC method

In order to investigate the effect of electrophilic effect (including electron-repellent effect) on dust charging in plasma, a calculation method of dust charging based on particle in cell (PIC) technology is established. Physically using surface-added charge to characterize the electrophilic effect, and the corresponding mathematical description is added in the calculation method. Based on this method, we have carried out calculations of multiple scene examples. The calculation results show that the stronger the electrophilic effect, the larger the dust balance charge. The amplification of dust balance charge has a close proportional relationship with the surface density of surface-added charge. Similarly, the electron-repellent dust also has this proportional relationship. However, unlike the electrophilic dust, the electron-repellent dust takes longer to reach the equilibrium charge. The larger the particle size of the dust, the more significant the effect of the equilibrium charge increase caused by the electrophilic effect. This method realizes the calculation ability of charged electron dust in the plasma. The calculation by this method shows that the electrophilic material can affect the dust charging in the plasma, which cannot be ignored when the electrophilic effect is strong enough.