Assignment of Axial Wavenumber in a Plasma Absorption Probe

Abstract

A plasma absorption probe (PAP) developed in previous studies is a novel plasma diagnosis, which is adopted even in a reactive gas. In the previous studies, higher series of measured absorptions were attributed to the higher-order azimuthal modes of plasma surface waves, showing a poor agreement with the theoretical prediction. In this theoretical note, the data from the previous studies are processed by considering that the absorptions are caused by the higher-order axial modes of plasma surface waves. The treated data show a good agreement with the theory within the accuracy of measurement.