Title :
An equivalent circuit model of a plasma core inductor
Author :
Nelatury, Sudarshan Rao ; Hemminger, Thomas Lee ; Sadiku, Matthew N O
Author_Institution :
Sch. of Eng. & Eng. Technol., Pennsylvania State Univ., Erie, PA, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
The impedance of an electrical coil wound over a fluorescent tube is found experimentally both when the tube is energized and de-energized. This paper reports results showing a significant change in the resonance characteristics of the coil due to the influence of the plasma core. The effects are described with the help of an equivalent circuit consisting of an inductance with a series resistance and a parallel capacitance. This paper demonstrates that by energizing the core, the series resistance and shunt capacitance in the equivalent circuit increase significantly. The experiment is performed both for alternating current and direct current excitations. From the observed results, fractional changes in the resonant characteristics are found and explained using a perturbational viewpoint. This enables us to indirectly estimate the plasma density profile and model the beam loading effects in high-energy radio frequency sources. The equivalent circuit model presented here can be employed to explain the macroscopic effect of low-temperature plasma on circuit elements within close proximity.
Keywords :
coils; discharges (electric); electric impedance; equivalent circuits; inductors; plasma density; plasma torches; beam loading effects; electrical coil impedance; equivalent circuit model; fluorescent tube; high-energy radiofrequency sources; low-temperature plasma; parallel capacitance; plasma core inductor; plasma density; resonance characteristics; series resistance; shunt capacitance; Capacitance; Coils; Equivalent circuits; Fluorescence; Impedance; Inductors; Plasma density; Plasma properties; Resonance; Wounds; Equivalent circuit; T-8 fluorescent tube; inductive plasma; plasma loading;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2005.848618