Download - Krakow gas gain measurements
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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
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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
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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
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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
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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
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Thank you for your attention!
Bartosz Mindur Krakow gas gain measurements