Effects of magnetic field on oscillatory structures in laser-blow-off plasma

Effects of magnetic field on the self-consistent oscillatory structures of the laser-blow-off plasma plume are studied using triple Langmuir probe. It is observed that trailing portion of floating potential profile shifted to higher value and this shift also varies with the strength of magnetic field, which is varied from 0 T to 0.15 T. Number of oscillatory structures decreases with increasing the strength of field. It is suggested that the change in density gradient in the presence of magnetic field could be the reason of reduction of oscillating structures.

► Laser-blow-off (LBO) plume is formed in magnetic field environment.
► Oscillatory structures are observed with and without magnetic field.
► Shift and number of oscillation amplitude depend on magnetic field.
► Wave velocity and amplitude depend on magnetic field.
► Neutral density gradient is reduced due to magnetic field.