The choice of gas in HEP detectors.

M. Bosteels 
April 4, 2002

    The talk shows a technical point of view of possible gas in large and fragile volumes. Some filling and recovering process is presented. Existing installations for RICH detectors with classical refrigeration unit are analysed and possible cryogenic is foreseen. The use of CO2 is also presented due to his specific physical characteristics. A table compares some easy and difficult gas mixtures regarding the gas system.