TPC development by the LCTPC collaboration for the ILD Detector at ILC

The International Large Detector (ILD) concept for the planned International Linear Collider (ILC) foresees a Time Projection Chamber (TPC) as the main tracking detector. Precision physics measurements at the ILC require a very accurate momentum resolution and a very efficient pattern recognition. In addition, the TPC structures must be built with very low material to enable precise measurements in calorimeters. The LCTPC (Linear Collider TPC) Collaboration is currently carrying on R&D studies using a large prototype, which can accommodate seven readout modules. Several prototypes of modules using Micromegas or GEM structures as gas amplification exist. They have been tested with electron beam at the EUDET facility at DESY in a 1T magnet. Besides the traditional pad readout, a pixel readout based on the Timepix chip is studied. Power pulsing and cooling method are also important issues. The current status and future plans of the R&D are reported.