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Operation of a GEM-TPC With Pixel Readout

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5 Author(s)

A prototype time projection chamber with 26 cm drift length was operated with a short-spaced triple gas electron multiplier (GEM) stack in a setup triggering on cosmic muon tracks. A small part of the anode plane is read out with a CMOS pixel application-specified integrated circuit (ASIC) named Timepix, which provides ultimate readout granularity. Pixel clusters of charge depositions corresponding to single primary electrons are observed and analyzed to reconstruct charged particle tracks. A dataset of several weeks of cosmic ray data is analyzed. The number of clusters per track length is well described by simulation. The obtained single point resolution approaches 50 μm at short drift distances and is well reproduced by a simple model of single-electron diffusion .

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Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 6 )