The Current Distribution of a Dipole Antenna in Magnetized Plasma and Its Effect on RF Plasma Probe Diagnostic Techniques

Details The Current Distribution of a Dipole Antenna in Magnetized Plasma and Its Effect on RF Plasma Probe Diagnostic Techniques The Current Distribution of a Dipole Antenna in Magnetized Plasma and Its Effect on RF Plasma Probe Diagnostic Techniques

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa53b1381w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA53B-1381

Other

0609 Antennas, 0644 Numerical Methods, 0654 Plasmas, 2494 Instruments And Techniques, 7894 Instruments And Techniques

Scientific paper

The accuracy of the data obtained from a Radio Frequency (RF) plasma probes greatly depends on our understanding of the underling physics. Traditional analytical methods assume a standard current distribution and perform an induced EMF analysis to determine the antenna's input impedance. However, recent advancements in numerical models, such as the Plasma Fluid Finite Difference Time Domain Model (PF- FDTD), enable researchers to avoid many of the underlining assumptions that have made the analytical models untrackable. This paper will address some of the recent discoveries concerning the current distribution that results from modeling a small signal applied to a dipole antenna in magnetized plasma via the PF-FDTD. These results raise questions as to the accuracy of previous recorded data sets. Changes in the current distribution shift the apparent parallel resonance structure off of the electron upper hybrid, which was previously assumed to be only dependent on the electron density. The improved incite that the parallel resonance is dependent upon both the antenna structure and the electron density will allow for a more accurate measurement of electron densities and other plasma parameters.

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