Abstract

A high-frequency multiple magnetic probe assembly has been specificallyfabricated for the study of current sheet dynamics in the axial acceleration phaseof a low-energy dense plasma focus (DPF) device operated in a nitrogen gasmedium. The response time of each probe is of the order of 1 ns and the tinystructure of the probe is well suited to sense the magnetic field associated with apulsed plasma without perturbing the plasma unduly. The magnetic probes werecalibrated using a simple, novel and reliable calibration technique and thecalibration factor is found to be 0.34 ± 0.028 T V−1.Our study reveals that the parabolic current sheet accelerates asit propagates through the electrode assembly, reaching a rundownvelocity of ∼6.1 cm µs−1.The average current sheet thickness in the axial acceleration phase is found to be∼3 cm. In our case, the current shedding and mass loss factors are estimated to be32% and 40% respectively. Our approach of using a high-frequency multiplemagnetic probe assembly for the study of current sheet dynamics in a DPF deviceis highly effective in obtaining precise and accurate measurements.

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