Study of diamagnetism in laser-produced plasma using B-dot probe

Time-varying diamagnetism in laser-produced plasma moving across the transverse magnetic field with different field strengths has been studied using fast imaging and magnetic probe. The emphasis of the present work is on the development of suitable B-dot probe and quantitative analysis of induced diamagnetic field in an expanding plasma plume. A Helmholtz coil associated with pulsed power system is used to produce uniform magnetic field of different strengths. Helmholtz coil allowed the plume imaging along the magnetic field lines, which gives the direct structural information of the induced diamagnetic cavity. A high frequency three-axis B-dot probe has been developed to measure the transient magnetic field. Different experimental approaches have been used to test the response, sensitivity and calibration of the developed probe. Findings indicate that plasma plume shows the perfect diamagnetic behaviour for the external field varying from 0.13 T to 0.57 T where the induced magnetic field almost completely displaced the external magnetic field.