Abstract
A Time Projection Chamber (TPC) is a candidate for the central tracker of the ILC detectors. TPCs based on Micropattern Gaseous Detectors (MPGD), described in the ILC Reference Design Report, have dimensions of 2.8–4 m in diameter and 3–4.6 m in length. They are to provide 200 space points with pad readout, along a particle track with the Rφ spatial resolution of 100μm per row or better. The momentum resolution of δ(1/pt)≤0.5×10−4(GeV/c)−1 is envisaged in the magnetic field of 3–4 T.To realize the excellent space point resolution of 100μm, a TPC with MPGD readout instead of the Multiwire Proportional Chamber (MWPC) readout is needed [1]. The MPGD under consideration are Gas Electron Multiplier (GEM) and Micromesh Gas detector (Micromegas). Both detectors are operated either with regular analog pad readout or with the digital TimePix readout.A Large Prototype (LP) of a TPC has been constructed, which has a diameter of about 750 mm and a length of about 600 mm and allows to measure tracks with up to 125 space points with pad readout. This prototype is fitting into a superconducting magnet, installed in a DESY test beam area and is exposed to 6 GeV electrons.A description of the setup as well as first beam results with the various readout options of the LP will be given.
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