Positron transport in gases

We review the field of positron transport physics in gases, starting with a historical overview. In particular, experiments which have measured positron drift velocities and mobilities in specially constructed cells are highlighted. The relevance of understanding positron transport in current efforts to manipulate trapped clouds of positrons is emphasised. We suggest some ways in which the output of a positron accumulator might be used to develop a new and versatile technique to study positron drift.