  Studies of Cathode Strip Chamber longevity, comparing Ar+CO2 gas mixtures
with fractions of 5%, 2%, and 0% CF4, were performed using several small
cathode strip prototype chambers. In each trial, a localized source of
radiation was used to irradiate up to an accumulated charge of about 300 mC/cm.
Additionally, longevity of a uniformly irradiated prototype operating with 2%
CF4 was studied at the CERN Gamma Irradiation Facility GIF++. Post-hoc analysis
of the chamber electrodes using spectroscopy techniques was also done.
