Abstract
The rate of surface recombination of cesium and potassium plasma ions on the hot tungsten end plates of a $Q$ machine has been measured with a Langmuir-Taylor detector. Good agreement of the measurements with the equilibrium theory of electrostatic confinement is found under conditions in which the plasma potential is not highly negative or positive ($|V|l\frac{2kT}{e}$). Corrections to the equilibrium theory for ion heating (highly negative plasma) and ion drifts (highly positive plasma) bring theory into good agreement with experiment over a range in density of 2 \ifmmode\times\else\texttimes\fi{} ${10}^{9}$ to 2 \ifmmode\times\else\texttimes\fi{} ${10}^{12}$ ${\mathrm{cm}}^{\ensuremath{-}3}$.
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