Influence of an external electric field on plasma parameters around an isolated dust particle

Abstract

The paper presents new numerical results on the behavior of plasma parameters around an isolated charged du st particle under the action of the external electric field. For the fir st time, the model takes into account the dependence of mean electron energy on the reduced electric field st rength. As a result of the calculations, the dependencies of self-consi st ent spatial di st ributions of the electron and ion densities and electric potential around the du st particle on reduced external electric field st rength were obtained. These di st ributions were analyzed through the expansion into Legendre polynomials. The processes of ion focusing and wake formation behind the du st particle were st udied. The du st particle charge and the dipole moment of the “ion cloud - du st particle” are calculated for different values of the reduced electric field and ion mean free paths. It is shown that in the determination of electron density spatial profile and the du st particle charge the dependence of electron temperature on electric field st rength plays a significant role. The paper presents new numerical results on the behavior of plasma parameters around an isolated charged dust particle under the action of the external electric field. For the first time, the model takes into account the dependence of mean electron energy on the reduced electric field strength. As a result of the calculations, the dependencies of self-consistent spatial distributions of the electron and ion densities and electric potential around the dust particle on reduced external electric field strength were obtained. These distributions were analyzed through the expansion into Legendre polynomials. The processes of ion focusing and wake formation behind the dust particle were studied. The dust particle charge and the dipole moment of the “ion cloud – dust particle” are calculated for different values of the reduced electric field and ion mean free paths. It is shown that in the determination of electron density spatial profile and the dust particle charge the dependence of electron temperature on electric field strength plays a significant role.