Analysis of multifrequency interferometry in a cylindrical plasma

Abstract

Articles you may be interested inCharacterization of a low-pressure chlorine plasma column sustained by propagating surface waves using phase-sensitive microwave interferometry and trace-rare-gas optical emission spectroscopy A microwave interferometer operating simultaneously at 70, 90, and 110 GHz is used to measure line integrated electron density in a plasma column in the VX-20 experiment. Interferometer beam sizes are a significant part of the plasma radius at some locations. We model the wave propagation through the plasma using a scalar wave approximation with assumptions of a Gaussian beam profile and plasma spatial profile. The phase shifts obtained from this model are compared with standard thin beam calculations and experimental data.where the amplitude R͑x , y , z͒ and the phase ͑x , y , z͒ are taken to be real quantities. We then obtain two coupled dif-REVIEW OF SCIENTIFIC INSTRUMENTS 77, 10E910 ͑2006͒

Super-Fresnel resolution of plasma inhomogeneities by electromagnetic sounding

“…As a rule, different methods of wave diagnostics (reflectometry, interferometry, polarimetry and tomography) are based on the geometrical optics (GO) method and measure the linear integrals over plasma parameters along the ray, connecting the source and the receiver. At any rate, linear integrals are characteristic of measurements of time delay, phase change and attenuation of a signal in the inhomogeneous plasma [1][2][3][4][5], so that linear integrals embrace group velocity, phase velocity (or refractive index) and attenuation index, respectfully.…”