Activity report of ILD-TPC Asia group
  The purpose of ILD-TPC Asia group is realization of high precision Time Projection Chamber (TPC) with Gas Electron Multiplier (GEM) as a central tracker in International Linear Collider (ILC). We have been studying the many R&D items to build the real detector as a member of LCTPC collaboration. This paper describes the our efforts for realization of the ILD-TPC, the result of test beam using large prototype TPC, local field distortion, positive ion effects and gate devices, and cooling electronics which are key items to build ILD-TPC. 
Y. Kato, R. Yonamine, P. Gros, J. Tian, S. Kawada, K. Fujii, T.   Matsuda, A. Sugiyama, O. Nitoh, T. Watanabe, T. Fusayasu, ...
physics.ins-det