Antenna Impedance Measures in a Magnetized Plasma. Part 1. Spherical Antenna
Abstract
The input impedance of a metal sphere immersed in a magnetized plasma is measured with a network analyzer at frequencies up to 1 GHz. The experiments were done in the Space Physics Simulation Chamber at the Naval Research Laboratory. The hot-filament argon plasma was varied between weakly (omega sub pe) and strongly (omega sub ce > omega sub pe) magnetized plasma with electron densities in the range 10 sup 7 - 10 sup 10 cm sup -3. It is observed that the lower-frequency resonance of the impedance characteristic previously associated with series sheath resonance omega sub sh in the unmagnetized plasma occurs at a hybrid sheath frequency of omega sub r squared = omega sub sh squared + k omega sub ce squared, with k a constant 0.5 < k < 1. As seen in previous experiments, the higher frequency resonance associated with the electron plasma frequency omega sub pe in the unmagnetized plasma is relocated to the upper hybrid frequency omega sub uh squared = omega sub pe squared + omega sub ce squared. As with the unmagnetized plasma, the maximum power deposition occurs at the lower frequency resonance omega sub r.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 16, 2006
- Accession Number
- ADA457022
Entities
People
- D. N. Walker
- David D. Blackwell
- Sarah J. Messer
- William E. Amatucci
Organizations
- United States Naval Research Laboratory