A TPC with Triple-GEM Gas Amplification and TimePix Readout
نویسنده
چکیده
We present measurements with a GEM based TPC prototypes and the TimePix CMOS ASIC as charge collecting anode. Tests with a small prototype were performed in a 5GeV electron beam at DESY. It is shown that the point resolution for short drift distances is better than 20 μm. The achieved time resolution is better than 10 ns at 100MHz clock frequency. Furthermore, experimental studies with an enlarged pixel size are addressed. To study the performance for longer drift distances a chamber with 26 cm drift length is operated in Bonn. Using also GEM and TimePix for the readout, data with cosmic muons and a Sr source are recorded. This chamber uses also GEMs and TimePix for the readout. data with cosmic muons and a Sr90 source are recorded. The dependency of spatial resolution and cluster properties on the drift distance are studied.
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