Dark Matter Time Projection Chamber: Recent R&D Results

The Dark Matter Time Projection Chamber collaboration recently reported a dark matter limit obtained with a 10 liter time projection chamber lled with CF 4 gas. The 10 liter detector was capable of 2D tracking (perpendicular to the drift direction) and 2D ducialization, and only used information from two CCD cameras when identifying tracks and rejecting backgrounds. Since that time, the col- laboration has explored the potential benets of photomultiplier tube and electronic charge readout to achieve 3D tracking, and particle iden- tication for background rejection. The latest results of this eort is described here.