We are going to investigate the local parameters of the plasma of an RF thruster in an external magnetic field. The Langmuir three-electrode probe was chosen as the measurement tool.
What are the methods of taking into account the effect of fields on measurements of a Langmuir probe?
Are there more suitable measurement methods for our case?
The theory of Langmuir probe is very complicated. There are lot of assumption in the derivations of probe current in different condition, whether probe is in high electric or in high magnetic field. However I have seen researcher using Langmuir probe for the measurement of plasma density in the scrape of layer of tokamak without any correction, where very high magnetic fields are present. Mostly researchers are using expression J=neV for the measurement.
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