Activity report of ILD-TPC Asia group

Nagasaki Institute of Applied Science (NiAS),536 Abamachi, Nagasaki 851-0193, JapanThe purpose of ILD-TPC Asia group is realization of high precision Time Projec-tion Chamber (TPC) with Gas Electron Multiplier (GEM) as a central tracker inInternational Linear Collider (ILC). We have been studying the many R&D itemsto build the real detector as a member of LCTPC collaboration. This paper de-scribes the our e orts for realization of the ILD-TPC, the result of test beam usinglarge prototype TPC, local eld distortion, positive ion e ects and gate devices, andcooling electronics which are key items to build ILD-TPC.