Laser-induced breakdown spectroscopy of aluminum plasma in the absence and presence of magnetic field

Abstract

) and time delay constant. At higher irradiances and pressures, saturation is observed, which is attributed to the self-regulating regime of plasma. In the case of time delay, both electron temperature and number density decay exponentially, which is according to the adiabatic expansion model. It is revealed that emission intensity and electron temperature are higher in the presence of magnetic field as compared to the field-free case, which is attributed to magnetic confinement, as well as the joule heating effect. Plasma plume confinement is confirmed by analytical evaluation factor β. β is an analytical factor that is the ratio of plasma pressure to magnetic pressure, i.e., β=Plasma pressureMagnetic pressure. It confirms the validity of magnetic field confinement if β is less than 1. As the evaluated values of β are less than 1 for all cases, they confirm the validity of magnetic confinement.