A Dual Magnetic Probe System for Phase Measurements in Thermal Induction Plasmas.
Rept. for Jun 70-Apr 71,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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Previously reported measurements of rf magnetic field distributions in thermal induction plasmas by a watercooled coil probe have been extended to phase measurements through the use of a second identical probe placed at a fixed position near the plasma boundary. From measurements of the vector sum andor difference in addition to the individual signals from both probes, data for the variation of the phase angle with radius were obtained. The reliability of the method was checked with an electrolyte of known conductivity. Tests conducted at 2.6 MHz in a 14 cm wide argon plasma column at ambient pressure yielded a change in phase angle of 285 degrees over the radius. The variations in phase and magnitude of the magnetic field were used to derive those of the induced electric field, the current density, the electrical conductivity, and the real part of the Poynting vector. From the latter a specific power input of about 1500 Wcm was obtained. Author
- Plasma Physics and Magnetohydrodynamics