Basic performance Mixtures tested: Mixtures tested: –Ar+10% CO 2 –Ar+2% Isobutane Pressures from 0.25 up to 1.5 bar tested up to now Pressures from 0.25 up to 1.5 bar tested up to now High gains (>10 4 ) achieved with simple spherical electrode High gains (>10 4 ) achieved with simple spherical electrode No need to go to very high V (better for minimizing absorption) No need to go to very high V (better for minimizing absorption)