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Updated: Jun 8, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
Published on: May 25, 2021
Correcting magnetic probe perturbations on current density measurements of current carrying plasmas
P Knoblauch1, V Raspa, F Di Lorenzo
1Departamento de Física, FCEyN-UBA, PLADEMA-CNEA, and INFIP-CONICET, Pab. 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina. pablotk@df.uba.ar
Abstract:
A method to infer the current density distribution in the current sheath of a plasma focus discharge from a magnetic probe is formulated and then applied to experimental data obtained in a 1.1 kJ device. Distortions on the magnetic probe signal caused by current redistribution and by a time-dependent total discharge current are considered simultaneously, leading to an integral equation for the current density. Two distinct, easy to implement, numerical procedures are given to solve such equation. Experimental results show the coexistence of at least two maxima in the current density structure of a nitrogen sheath.
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