CF4 ISOBUTANE DRIFT CHAMBER

Investigations of a drift chamber with a square 6 X 6-mm cell filled w ith a mixture of 80% CF4 and 20% isobutane are discussed. Experiments have been performed under a beam of electrons, muons, and pions with a momentum of 64 MeV/c at the TRIUMF accelerator (Canada). The coordina te resolution of the chamber with respect to relativistic particles si gma similar or equal to 120 mu m and the total collection time of ioni zation electrons (dead time) is similar or equal to 35 nsec. The proba bility of S-electron generation in the gas mixture has been determined .