Abstract
The effect of field errors on the plasma confinement is studied in the dc octopole. These studies were conducted at very low densities, when the mean free path is greater than the characteristic machine dimensions. Both classical diffusion and electron-neutral scattering are negligible because of the low densities and high magnetic fields employed in the measurements. The axisymmetric error field of a few percent does not affect the confinement time. The axially asymmetric error field of a small fraction of a percent reduces the confinement time substantially. The dependence of the confinement time on the octopole and the error field, the ion mass, and the electron temperature is studied. The results indicate that the plasma loss in the dc octopole is due to the flow along the flux lines which spiral out of the confinement volume in presence of the error field.
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