Abstract
Helium gas mixtures can improve traciing resolution for particles below 1 GeV/ c because of the reduction in multiple scattering. We have measured the drift velocity and spatial resolution of several interesting mixtures including helium:DME and helium:CO 2:isobutane. We discuss the advantages and disadvantages of using such a gas mixture for a detector at a B-meson factory, and conclude that helium:DME (80:20) and (70:30) mixtures will give significantly improved momentum resolution. The low drift velocity in such mixtures is a disadvantage in a high rate environment, but this is partly compensated by a low sensitivity to synchrotron radiation background.
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