Design and Construction of a TPC using GEM Foils for Gas Amplification
  The challenging physics program at the International Linear Collider (ILC) poses stringent requirements on the performance of its tracking system. A large volume time projection chamber (TPC) is considered a good candidate for such a tracker. Whereas conventional TPCs used a wired based gas amplification system, a future TPC is likely to make use of micro pattern gas detectors as e. g. gas electron multipliers (GEMs) for gas amplification. This talk gives an overview over recent achievements from the R&D activities to build a TPC with a GEM based gas amplification system. This includes charge transfer studies through multiple GEM structures, field cage design and spatial resolution measurements in high magnetic fields. 
Peter Wienemann