Charge amplification concepts for direction-sensitive dark matter   detectors
  Direction measurement of weakly interacting massive particles in time-projection chambers can provide definite evidence of their existence and help to determine their properties. This article demonstrates several concepts for charge amplification in time-projection chambers that can be used in direction-sensitive dark matter search experiments. We demonstrate reconstruction of the 'head-tail' effect for nuclear recoils above 100keV, and discuss the detector performance in the context of dark matter detection and scaling to large detector volumes. 
D.Dujmic, P.Fisher, G.Sciolla, S.Ahlen, V.Dutta, S.Henderson,   A.Kaboth, G.Kohse, R.Lanza, J.Monroe, A.Roccaro, N.Skvorodne...