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Krakow gas gainmeasurements
Bartosz Mindur
Faculty of Physics and Applied Computer ScienceAGH University of Science and Technology
RD51 mini-week, WG4 session, 05-12-2012
Bartosz Mindur Krakow gas gain measurements
Measurement test bench
Gas distribution system
Pumping station (below notseen)
Valve for external gasbottles connection (rightside)
Two housings for chambers(left side - partially seen)
HV power supply (i.e.CAEN)
Keithley 6485 Picoammeter(10 fA resolution)
Bartosz Mindur Krakow gas gain measurements
Chambers
Two chambers insideseparate housings
Made out of copperBeryllium windowExternal φ=28 mmInternal φ=25 mmLength about 250 mmAnode wire – gold platedtungsten
φ=100 µmφ=48 µm
Independent HV, currentreadout and gas supply
Bartosz Mindur Krakow gas gain measurements
Minimization of dark current
Problems with dark currentin previous setup
Solution guarding rings
Eliminates current flow fromcathode to anode troughinsulators
Slightly more complicatedsolution – see picture
Bartosz Mindur Krakow gas gain measurements
Conclusions
New setup (almost) ready
Vacuum tight
Chambers ready (not yet connected to HV)Soon measurements will start
First with Ar/CO2CO2 concentrations <5% and >30%Pressure (absolute) for the moment <2.5 Bar
Other gas mixture measurements we can define later (whenwe see results from Ar/CO2)
Bartosz Mindur Krakow gas gain measurements
Thank you for your attention!
Bartosz Mindur Krakow gas gain measurements