  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.
