Small scale time projection chamber setup to test the purity of liquid krypton from the NA62 experiment at CERN

Abstract A high liquid krypton purity level is essential for the NA62 calorimeter at CERN to ensure long lifetimes of ionization electrons in detector. small time projection chamber (TPC) system was developed enable measurement oxygen equivalent ppb level. This paper describes dedicated cryogenic setup and procedures required operate monitor system, while guaranteeing condensation 119 K without freezing it 115.8 on cryocooler-based heat exchanger. The focus materials used, instrumentation pressure safety equipment that allowed bake-out purging reach levels impurities two litre vessel containing TPC. integrated experimental area successfully tested with purified commercially obtained krypton.