Simple models for RPC weighting fields and potentials

Using conformal maps, formulae are derived and public (http://www.itp.tu-graz.ac.at/schnizer/Theory_of_Chambers/) Mathematica programs are developed giving the weighting potentials and fields in simple models approximating the electrode configurations in Gas Microstrip or Resistive Plate Chambers. These models are a plane condensor with a strip under tension attached to one electrode and a plane condensor, one of whose electrodes is divided by a gap.