DMTPC-10L: Direction-Sensitive Dark Matter Detector Prototype
  The known direction of motion of dark matter particles relative to the Earth may be a key for their unambiguous identification even in the presence of backgrounds. We describe a prototype detector that is able to reconstruct direction vectors of weakly interacting massive particles that may the dominant constituent of the dark matter in our galaxy. The detector uses a low-density gas (CF4) in a 10liter time-projection chamber with mesh-based electrodes and optical and charge readout. Initial results confirm good performance in the reconstruction of direction angle and sense ('head-tail') for low-momentum nuclear recoils. 
D. Dujmic, P. Fisher, R. Lanza, J. Lopez, A. Kaboth, G. Kohse, J.   Monroe, R. Vanderspek, G.Sciolla, R. Yamamoto, S. Ahlen,...