Abstract
To eliminate the anomalous loss due to convective cells produced by the existence of the supports in the plasma volume, a levitated superconducting ring was installed in the Princeton spherator. The plasma decay time is increased from 10-15 msec in the supported version to a maximum of 150-220 msec for a helium discharge plasma. At ${n}_{e}=2\ifmmode\times\else\texttimes\fi{}{10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ and ${T}_{e}=1\ensuremath{-}2$ eV, this decay time is \textonehalf{} to \textonequarter{} of the calculated density decay time due to the classical diffusion process.
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