the PSI protium gas filling system (status report by Claude Petitjean to the Gatchina collaboration meeting June 14-17) Main components of the PSI gas system: - Alu vessel with TPC, heating jacket used up to 120 C - high vacuum pumping system (dry forevacuum + turbo pump) - main pumping tube with penning gauge and 10 bar valve to UHV recipient - UHV recipient contains: - ionisation gauge (10 -3 to mbar), pirani gauge (<10 -3 mbar) - mass spectrometer (very useful for gas analysis and leak searches) - valves connecting to gas handling system - gas handling system contains: - three 10-liter high pressure stainless steel bottles - two hydride beds for protium storage (capacity 550 & 750 stp liter) - Palladium filter for producing ultra clean protium gas (+1 spare) - Whatman protium generator (from Canadian <1ppm depleted water) - three digital pressure transducers - 2μ gas filter to avoid dust entering the vessel during filling - Zeolite pressurizer (capacity 100 stp liter, used by Gatchina crew only)

Overview of TPC and gas handling in the lab

TURBO 1 bar10 bar MASS SPEC μ beam T P C ALU PRESSURE VESSEL PENNING VACUUM FILTER 2 μ ION GAUGE PIRANI SAFETY FORE VACUUM IN OUT PD FILTER WHATMAN PROTIUM GENERATOR 10 l 550 stp liter 750 stp liter 100 stp liter 10 l SAMPLE VOLUME bar 0-25 bar FILLING LINE N2N2 VACUUM LINE BLEEDOUTIN The MuCap protium gas handling system at PSI HYDRIDE BEDS ZEOLITE BED 10 bar 40 l 12 bar H2OH2O IN OUT 0-50 bar UH VAC CP&CP

lab-photo of the PSI gas handling (status June-10-04)

closeup view of the PSI gas handling system (status June )