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COMPASS RICH-1 has used high-purity perfluorobutane as radiator gas since2001. The operation and control of the radiator gas has evolved over years withcontinuous improvements. We report on the experience gained in the 20 year-longoperation of perfluorobutane as COMPASS RICH radiator. Very accurate values forthe radiator gas refractive index are needed for high-performance particleidentification. The procedure has evolved over years and the one presently inuse, which provides refractive index estimate at the 1 ppm level, is discussed.Perfluorobutane procurement is becoming challenging, and the minimization ofmaterial waste is now a priority for the protection of the environment.Commercially available perfluorobutane needs dedicated filtering before usageand typical material losses in the filtering procedure were around 30%. Recentefforts allowed us to reduce them to about 5%. A potential alternative tofluorocarbon radiators in gaseous RICHes is also presented.

nuclear instruments and methods in physics research. section a, accelerators, spectrometers, detectors and associated equipment/nuclear instruments and methods in physics research. section a, accelerators, spectrometers, detectors and associated equipment

Long term experience with perfluorobutane in COMPASS RICH