Processes

• Electronics Response is not dependent on any processes within the chamber. Given a signal that is induced on a cathode pad, it should report the pulse height in ADC counts. It must accurately reflect the transfer function of the electronics generating the appropriate correlated and uncorrelated noise and accessing the calibration data base if required. Because it is independent of chamber processes it should allow the modelling of the response from the FEE pulser as well.
• Cluster Shape at zero drift length No magnetic field. Any study with the TpcResponseSimulator will require an accurate knowledge of the cluster profile. Zero drift/no B field represents the most simple case as complications due to transport properties of the field cage and gas mixture do not enter. This however relies on the accurate modelling of the electronics response.
• Cluster Shape versus drift No magnetic field. The incorporation of the drift properties of the chamber and gas mixture is the next logical progression. Cluster studies can begin at this point as well as analysis of drift field distortions. High track density environments as well as cluster finder performance can also be investigated.
• Inclusion of B field The magnetic field will affect two components of the simulation: the drift properties, and the amplification. The transverse diffusion is reduced with the inclusion of a magnetic field. The trajectory of the drifting ionization is also altered if there is any misalignment of the E and B fields due to a real geometric misalignment or an inhomogeneous magnetic field. The charge collection at the anode wires is also modified due to the interaction of a strong radial E field at the sense wires with the B field.
• Ionization studies is the most difficult simulation because it is dependent on a detailed understanding of the above points. The points of interest here are concerns beyond a cluster finders performance. Concerns should focus on effects due to delta electrons, optimization of quantifying the mean or most probable energy loss for a single track and changes in behavior with different gas mixtures.
• Beyond... It is doubtful the simulation precision will extend beyond the scope of this, however one thing that has never been studied in a relativistic heavy ion experiment is the chamber evolution and whether effects like performance degradation and chamber ageing could be modelled. This is a long term project if one would choose to take it on...

This is a summary of the studies that should define the scope of the simulation. If you feel there is something missing and should be added please let the group know!!!