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We present measurements with a GEM based TPC prototypes and the TimePix CMOSASIC as charge collecting anode. Tests with a small prototype were performed ina 5 GeV electron beam at DESY. Different GEM orientations and geometries weretested. It is shown that the point resolution for short drift distances isbetter than 20 micrometer. The achieved time resolution is better than 10 ns at100 MHz clock frequency. Furthermore, experimental studies with an enlargedpixel size are addressed. To study the performance for longer drift distances achamber with 26 cm drift length is operated in Bonn. Using also GEM and TimePixfor the readout, data with cosmic muons and a Sr90 source are recorded. Thespatial resolution and cluster properties are studied in dependence on thedrift distance.

A TPC with Triple-GEM Gas Amplification and TimePix Readout