I ran into a problem when measuring the RF magnetic field with a magnetic probe in a helicon discharge. I measure three field components with coils, using a balanced transformer to filter the capacitive pickup. The probe is located across the axis of the installation on a slide in the diverging field of the expansion volume (about 55 cm distance from discharge camera center). In most cases, the field profiles are not symmetric and do not fit any analytical solution (helicon antenna, m = + - 1). in addition, I found that the z field component changes its amplitude under the same conditions. What could be the reason?
By changing the amplitude do you mean changing its sign?. There can be an asymmetry in the magnetic field produced by the coil causing such an issue. Try using some Magnetostatic simulation code to map the magnetic field (CST studio, COMSOL,etc). It may give you a better and accurate analysis compared to a simple analytical solution.
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