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The dynamics of the movement of gas is discussed for two-chambered polarizedHe-3 target cells of the sort that have been used successfully for manyelectron scattering experiments. A detailed analysis is presented showing thatdiffusion is a limiting factor in target performance, particularly as thesetargets are run at increasingly high luminosities. Measurements are presentedon a new prototype polarized He-3 target cell in which the movement of gas isdue largely to convection instead of diffusion. NMR tagging techniques havebeen used to visualize the gas flow, showing velocities along acylindrically-shaped target of between 5-80 cm/min. The new target designaddresses one of the principle obstacles to running polarized He-3 targets atsubstantially higher luminosities while simultaneously providing newflexibility in target geometry.

Gas dynamics in high-luminosity polarized He-3 targets using diffusion and convection