Plasma Impedance Measurements Using a Small Spherical Probe$^{1}

Details Plasma Impedance Measurements Using a Small Spherical Probe$^{1} Plasma Impedance Measurements Using a Small Spherical Probe$^{1}

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0483w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0483

Physics

Space Physics

7831 Laboratory Studies, 7853 Spacecraft/Atmosphere Interactions, 7855 Spacecraft Sheaths, Wakes, Charging, 7899 General Or Miscellaneous

Scientific paper

Using the response of a spherical probe to a swept RF signal generated with a network analyzer, we have begun a study of plasma impedance properties in the large Space Physics Simulation Chamber (SPSC) at the Naval Research Laboratory. From a measurement of the ratio of reflected to incident power we characterize plasma impedance as a function of the probe driving frequency which is much lower than frequencies for detectable electromagnetic radiation. We demonstrate the measurement of electron density and compare results to those of a Langmuir probe. As the capacitive and inductive responses of the plasma are adiabatic, it is only in the presence of a dissipation mechanism that the driving energy can be extracted as work. In plasmas where the total electron collision frequency, ν e, is on the order of or larger than the plasma frequency, ω p, the dissipation often occurs through collisions. In the case of collisionless plasmas the sheath-plasma resonance, which occurs at fractions of ω p, up to ω p/2, is a possible dissipation mechanism. We present observations of energy transfer under collisionless conditions and compare this to predictions of a kinetic approach. 1Work supported by ONR and DARPA

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