Signal shapes in a TPC wire chamber

We study signal shapes in Multi Wire Proportional Chambers (MWPCs) and the influence of the electron distribution around the wire on the ion tail characteristics. Simulations of the ion tail for two different geometries, different voltages and therefore gas gains were performed. These simulations are compared to measurements carried out with the ALICE TPC wire chambers for a Ne/CO2/N2 gas mixture, which allows to extract the avalanche spread around the anode wires of the MWPC.