CO2 COOLING FOR PARTICLE DETECTORS: EXPERIENCES FROM THE CMS AND ATLAS DETECTOR SYSTEMS AT THE LHC, AND PROSPECTS FOR FUTURE UPGRADES BORTOLIN C.(*), CRESPO-LOPEZ O.(*), DAGUIN J.(*), GODLEWSKI J.(*), NOITE J.(*), OSTREGA M.(****), PAVIS S.(*), PETAGNA P.(*), POSTEMA H.(*), TROPEA P.(*), VERLAAT B.(**), VOGT S.(***), ZIMNY M.(****), ZWALINSKI L.(*) (*) European Organization for Nuclear Research (CERN), Switzerland, (**) National Institute for Subatomic Physics (NIKHEF), Netherlands, (***) Max Planck Institute for Physics (MPI), Germany, (****) AGH University of Science and Technology, Poland