On a gas of ∼104protons, contained at ∼10−11Torr in a parabolic rf trap of depthD¯between 2.6 and 10.4 V, equilibrium temperatureskTi≃0.1eD¯and storage timesT≃100 sec were measured ordinarily, both apparently determined by ``evaporation'' processes. When cooling the ions by coupling their disordered oscillatory heat motion to anLCcircuit at room temperature,Tidropped another factor of 3 to as low as 900°K andTincreased to ∼3000 sec.