%0 Journal Article
%T Negative Ion Drift and Diffusion in a TPC near 1 Bar
%A C. J. Martoff
%A R. Ayad
%A M. Katz-Hyman
%A G. Bonvicini
%A A. Schreiner
%J Physics
%D 2004
%I arXiv
%R 10.1016/j.nima.2005.08.103
%X Drift velocity and longitudinal diffusion measurements are reported for a Negative Ion TPC (NITPC) operating with Helium + carbon disulfide gas mixtures at total pressures from 160 to 700 torr. Longitudinal diffusion at the thermal-limit was observed for drift fields up to at least 700 V/cm in all gas mixtures tested. The results are of particular interest in connection with mechanical simplification of Dark Matter searches such as DRIFT, and for high energy physics experiments in which a low-Z, low density, gaseous tracking detector with no appreciable Lorentz drift is needed for operation in very high magnetic fields.
%U http://arxiv.org/abs/physics/0406114v1