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Thomson-scattering density measurements in 2XII at low magnetic guide fields

Five microwave interferometers are used to measure radial and longitudinal electron density profiles versus time in the 2XII minimum-B mirror containment experiment. The mean plasma radius determined from a radially offset interferometer agrees with electrostatic probe and laser measurements. The longitudinal profile is consistent with a collisional ion angular distribution with a density at the mirrors of approximately 570 of the central density. After compression the plasma shape remains approximately constant. Plasma densities beyond the mirrors were less than 570 of the central density.